From dc1152b685596a56853d58446f4c94c830a62322 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Sun, 4 Oct 2026 23:30:34 +0200
Subject: [PATCH 01/42] Pages hold only the part of the nav tree that shows on
 opening; assets/js/nav.js holds the whole tree and puts it in place (HTML 137
 MB -> 32 MB)

---
 builder/cpu-worker.mjs                | 43 +-----------
 builder/offline-rewrite.mjs           | 53 ---------------
 builder/offline.mjs                   | 35 +++++++++-
 builder/tbdocs.mjs                    |  7 +-
 builder/template.mjs                  | 95 ++++++++++++++++++++-------
 docs/Documentation/Builder.md         | 22 ++++---
 docs/Documentation/Extending.md       |  2 +-
 docs/Documentation/Pipeline-Stages.md | 20 +++---
 8 files changed, 133 insertions(+), 144 deletions(-)

diff --git a/builder/cpu-worker.mjs b/builder/cpu-worker.mjs
index 14eb842b4..c71e12bad 100644
--- a/builder/cpu-worker.mjs
+++ b/builder/cpu-worker.mjs
@@ -15,7 +15,7 @@ import { templatePhase } from "./template.mjs";
 import { unpackShared } from "./sab-broadcast.mjs";
 import { deriveSearchEntries } from "./search.mjs";
 import { computeChunkSeo } from "./seo.mjs";
-import { deriveOfflinePage, deriveOfflinePageCached, sliceNavBlock, posixDirname } from "./offline-rewrite.mjs";
+import { deriveOfflinePage } from "./offline-rewrite.mjs";
 import { normalizeBaseurl } from "./url.mjs";
 
 import {
@@ -206,48 +206,9 @@ const handlers = {
         caches: { rawResolution: new Map(), seg: new Map(), result: new Map() },
       };
 
-      // PLAN-9 §5.3 (B7) nav-block cache: the just-the-docs sidebar in
-      // `<nav id="site-nav">...</nav>` is byte-identical across every page
-      // site-wide before rewrite (template.mjs's renderSidebar takes only
-      // `site`, not `page`; the per-page active highlight lives in a
-      // separate `<style id="jtd-nav-activation">` block emitted in
-      // <head>, not as inline class attributes on the nav anchors). The
-      // HTML rewrite pass spends ~200 ms per build re-running the per-
-      // match callback over that ~80kB block on each of 837 pages. The
-      // cache stashes the pre/post-rewrite nav slices once per
-      // **destination** dir (the URL rewrite is keyed by `fileSegs`,
-      // derived from `page.destPath`) and the per-page rewriter below
-      // substitutes them in instead of re-scanning.
-      //
-      // Asserted-premise design (§7.D11): each subsequent page checks that
-      // its pre-rewrite nav block matches the cached `input` byte-for-byte.
-      // On miss it falls back to the full rewrite with a warning -- the
-      // cache is purely an optimisation, never a correctness dependency.
       const writable = chunk.filter((p) => p.html !== undefined);
-      const byDir = new Map();
       for (const p of writable) {
-        const destDir = posixDirname(p.destPath);
-        let g = byDir.get(destDir);
-        if (!g) {
-          g = [];
-          byDir.set(destDir, g);
-        }
-        g.push(p);
-      }
-      const navCache = new Map();
-      for (const [destDir, group] of byDir) {
-        const first = group[0];
-        const input = sliceNavBlock(first.html);
-        if (input === null) continue;
-        const { html: rendered } = deriveOfflinePage(first, offlineState);
-        const output = sliceNavBlock(rendered);
-        if (output === null) continue;
-        navCache.set(destDir, { input, output });
-      }
-      offlineState.navCache = navCache;
-
-      for (const p of writable) {
-        const { html, misses } = deriveOfflinePageCached(p, offlineState);
+        const { html, misses } = deriveOfflinePage(p, offlineState);
         p.offlineHtml = html;
         p.offlineMisses = misses;
       }
diff --git a/builder/offline-rewrite.mjs b/builder/offline-rewrite.mjs
index 597e91646..759ad266c 100644
--- a/builder/offline-rewrite.mjs
+++ b/builder/offline-rewrite.mjs
@@ -12,8 +12,6 @@
 //                         posixDirname, getPageCache)
 //   §D  HTML rewrite     (stripSeo, stripFontPreloads, rewriteHtml,
 //                         injectSearchSetup,
-//                         sliceNavBlock, NAV_OPEN_RE, NAV_CLOSE,
-//                         NAV_PLACEHOLDER, deriveOfflinePageCached,
 //                         deriveOfflinePage, SEO_BLOCK_RE, TITLE_RE,
 //                         HTML_COMBINED_RE, JTD_SCRIPT_TAG_RE)
 //   §E  CSS rewrite      (rewriteCss, CSS_URL_RE, deriveOfflineCss)
@@ -365,57 +363,6 @@ export function injectSearchSetup(html, fileSegs) {
   });
 }
 
-export const NAV_OPEN_RE = /<nav aria-label="Main" id="site-nav"[^>]*>/;
-export const NAV_CLOSE = "</nav>";
-
-// Slice the sidebar nav block out of an HTML page. Returns the literal
-// `<nav ...>...</nav>` substring, or null if the page doesn't carry
-// the expected sidebar shape (in which case the cache entry is skipped
-// for the source dir and subsequent pages fall back to the full path).
-export function sliceNavBlock(html) {
-  const m = html.match(NAV_OPEN_RE);
-  if (!m) return null;
-  const start = m.index;
-  const end = html.indexOf(NAV_CLOSE, start);
-  if (end === -1) return null;
-  return html.slice(start, end + NAV_CLOSE.length);
-}
-
-// Placeholder spliced in place of the cached input nav while
-// deriveOfflinePage runs. An HTML comment so it never collides with
-// the three alternatives in HTML_COMBINED_RE (<code> / <pre> /
-// href|src=), the SEO-block regex (different prefix), the JTD script
-// tag regex (different prefix), or any other rewrite step.
-export const NAV_PLACEHOLDER = "<!--TBDOCS_NAV_CACHE_-->";
-
-// Cache-consulting wrapper around deriveOfflinePage. On hit:
-// substitutes the cached input slice with a placeholder, runs the
-// rewrite over the ~80kB-smaller string, splices the cached output
-// back in. On miss (no cache entry for the source dir OR the input
-// slice doesn't match byte-for-byte): falls back to the full
-// rewrite with a warning.
-export function deriveOfflinePageCached(page, deps) {
-  const destDir = posixDirname(page.destPath);
-  const cached = deps.navCache?.get(destDir);
-  if (!cached) return deriveOfflinePage(page, deps);
-
-  const idx = page.html.indexOf(cached.input);
-  if (idx === -1) {
-    console.warn(
-      `offline nav cache miss for ${page.srcRel}: ` +
-        `nav block doesn't match first page in ${destDir}; ` +
-        `falling back to full rewrite`,
-    );
-    return deriveOfflinePage(page, deps);
-  }
-
-  const stubbed = page.html.slice(0, idx) + NAV_PLACEHOLDER + page.html.slice(idx + cached.input.length);
-  const stubbedPage = { ...page, html: stubbed };
-  const { html: stubbedOut, misses } = deriveOfflinePage(stubbedPage, deps);
-  const out = stubbedOut.replace(NAV_PLACEHOLDER, cached.output);
-  return { html: out, misses };
-}
-
 // Pure-compute: apply strip + URL rewrite + script injection to a
 // single rendered page. Returns `{ html, misses }`. The page must
 // have `page.html !== undefined`. The state's caches are mutated for
diff --git a/builder/offline.mjs b/builder/offline.mjs
index 2d60e2f02..734fd12cb 100644
--- a/builder/offline.mjs
+++ b/builder/offline.mjs
@@ -28,7 +28,16 @@ import * as acornWalk from "acorn-walk";
 
 import { WRITE_LIMIT, mkdirRec, runLimited, safeWrite, writeFileMkdirp } from "./write.mjs";
 
-import { offlineExcluded, deriveOfflineCss, deriveOfflineRedirect } from "./offline-rewrite.mjs";
+import {
+  offlineExcluded,
+  deriveOfflineCss,
+  deriveOfflineRedirect,
+  fileDirSegsFromRel,
+  posixDirname,
+  rewriteHtml,
+  warnMisses,
+} from "./offline-rewrite.mjs";
+import { NAV_SCRIPT_REL, navScript, renderFullNav } from "./template.mjs";
 import { normalizeBaseurl } from "./url.mjs";
 import { posix } from "./paths.mjs";
 
@@ -103,6 +112,8 @@ export async function writeOffline(
   subT?.lap("jtdPatch");
   await writeSearchDataJs(path.join(deps.offlineRoot, "assets/js/search-data.js"), auxStats?.search?.json ?? null);
   subT?.lap("searchDataJs");
+  await writeOfflineNavJs(site, deps);
+  subT?.lap("navJs");
 
   // PLAN-9 §5.7: per-branch timing. The three Promise.all branches
   // overlap, so each branch's reported duration is the await time
@@ -199,7 +210,8 @@ async function copyOfflineStatics(staticFiles, deps) {
 }
 
 // §5.5  copyOfflineThemeAssets -- mirror _site/assets/, rewrite CSS,
-// skip the patched JTD JS (step [3] already wrote it).
+// skip the patched JTD JS (step [3] already wrote it) and nav.js
+// (writeOfflineNavJs writes the offline one).
 async function copyOfflineThemeAssets(deps) {
   const { destRoot, offlineRoot, counters, staticDestRels } = deps;
   const themeRoot = path.join(destRoot, "assets");
@@ -209,6 +221,7 @@ async function copyOfflineThemeAssets(deps) {
 
   await runLimited(themeEntries, LIMIT, async (e) => {
     if (e.isJtdJs) return;
+    if (e.isNavJs) return;
     if (e.isCombinedCss) return;
     const relAsset = "assets/" + e.relUnderAssets;
     // Already written by copyOfflineStatics -- see staticDestRels above.
@@ -511,6 +524,23 @@ export function deriveOfflineJtdJs(src) {
   return { js: out, patches, warnings };
 }
 
+// The offline nav.js: the whole tree with its links made relative as a
+// page at the root has them. The script puts the page's OFFLINE_SITE_ROOT
+// in front of each.
+async function writeOfflineNavJs(site, deps) {
+  const { rewritten, misses, missed } = rewriteHtml(
+    renderFullNav(site),
+    posixDirname("index.html"),
+    fileDirSegsFromRel("index.html"),
+    deps.sitePaths,
+    deps.caches,
+    deps.baseurl,
+  );
+  if (misses) warnMisses(NAV_SCRIPT_REL, misses, missed);
+  deps.counters.unresolved += misses;
+  await writeFileMkdirp(path.join(deps.offlineRoot, NAV_SCRIPT_REL), navScript(rewritten));
+}
+
 // §6.10  writeSearchDataJs -- wrap the JSON as a window.SEARCH_DATA
 // assignment so a <script src=> can load it under file://.
 async function writeSearchDataJs(destPath, jsonBytes) {
@@ -552,6 +582,7 @@ async function collectThemeFiles(themeRoot) {
           isCss: childRel.endsWith(".css"),
           isCombinedCss: childRel === "css/just-the-docs-combined.css",
           isJtdJs: childRel === "js/just-the-docs.js",
+          isNavJs: `assets/${childRel}` === NAV_SCRIPT_REL,
         });
       }
     }
diff --git a/builder/tbdocs.mjs b/builder/tbdocs.mjs
index 858bc0b0e..bf1d51740 100644
--- a/builder/tbdocs.mjs
+++ b/builder/tbdocs.mjs
@@ -62,7 +62,7 @@ import { resolveBookChapters } from "./book.mjs";
 import { loadData } from "./data.mjs";
 import { createMarkdownIt, buildLinkTables, serializeLinkTables } from "./render.mjs";
 import { loadHighlightTheme } from "./highlight-theme.mjs";
-import { buildInitConfig, renderSidebar } from "./template.mjs";
+import { NAV_SCRIPT_REL, buildInitConfig, navScript, renderFullNav, renderSidebar } from "./template.mjs";
 import {
   writePhase,
   prepareDestinations,
@@ -626,6 +626,7 @@ const TASKS = {
         ...enumerateVendoredThemeAssets(),
         "assets/css/tb-highlight.css",
         "assets/css/just-the-docs-combined.css",
+        NAV_SCRIPT_REL,
       ];
       const sitePaths = buildSitePathsSync(state.pages, state.staticFiles, excludePatterns, stubs, themeAssetRels);
       state.sitePaths = sitePaths;
@@ -851,12 +852,12 @@ const TASKS = {
     // copies that list. The chain prepPageDirs <- prepDest <- dispatch
     // <- markdownInit happens to order them today; naming the dependency
     // is what keeps that true.
-    expected: ["dot", "vendorAssets", "prepPageDirs", "highlighterInit"],
+    expected: ["nav", "dot", "vendorAssets", "prepPageDirs", "highlighterInit"],
     runOnMain: true,
     async execute({ dot: _dotSignal, highlighterInit: _highlightSignal }, ctx, state) {
       void _dotSignal; // dependency signal only; append already happened in dot.submit
       void _highlightSignal; // dependency signal only; highlightCss already written to state.site
-      const generatedAssets = [];
+      const generatedAssets = [{ rel: NAV_SCRIPT_REL, content: navScript(renderFullNav(state.site)) }];
       if (state.site.highlightCss) {
         generatedAssets.push({ rel: "assets/css/tb-highlight.css", content: state.site.highlightCss });
       }
diff --git a/builder/template.mjs b/builder/template.mjs
index 313173caf..53d8bee31 100644
--- a/builder/template.mjs
+++ b/builder/template.mjs
@@ -95,7 +95,7 @@ function templatePage(page, site, init) {
     `  <div id="a11y-status" class="sr-only" aria-live="polite" aria-atomic="true"></div>\n` +
     init.svgSprites +
     `\n` +
-    init.sidebar +
+    renderPageSidebar(init.sidebar, page) +
     `\n` +
     `  <div class="main" id="page-top">\n` +
     init.header +
@@ -360,29 +360,71 @@ function buildSvgSprites(config) {
 
 // ---------- §5.4 sidebar + recursive nav ---------------------------------
 
+export const NAV_SCRIPT_REL = "assets/js/nav.js";
+
+// The sidebar is the same on every page but for the nav tree, so it is
+// rendered once as the parts around the tree. A page holds only the part
+// of the tree that shows when it opens: the top level, and the children of
+// the page and of each of its ancestors (`renderPageSidebar`). The whole
+// tree is in the shared /assets/js/nav.js (`navScript`), loaded right after
+// the nav, which puts it in place before the page's scripts run. The
+// part keeps every sibling of the expanded path, so the nth-child
+// selectors of `navActivationCss` find the same items in both.
 function renderSidebar(site) {
   const config = site.config;
   const baseurl = String(config.baseurl ?? "");
+  return {
+    head:
+      `  <div class="side-bar">\n` +
+      `    <div class="site-header" role="banner">\n` +
+      `      <a href="${escapeMarkupAndQuotes(relativeUrl("/", baseurl))}" class="site-title lh-tight">${renderSiteTitle(config)}</a>\n` +
+      `      <button id="menu-button" class="site-button btn-reset" aria-label="Toggle menu" aria-expanded="false" aria-controls="site-nav">\n` +
+      `        <svg viewBox="0 0 24 24" class="icon" aria-hidden="true"><use xlink:href="#svg-menu"></use></svg>\n` +
+      `      </button>\n` +
+      `    </div>\n` +
+      `    <nav aria-label="Main" id="site-nav" class="site-nav">`,
+    tail:
+      renderNavExternalLinks(config) +
+      `</nav>\n` +
+      `    <script src="${escapeMarkupAndQuotes(relativeUrl(`/${NAV_SCRIPT_REL}`, baseurl))}"></script>\n` +
+      // Upstream sidebar.html: when nav_footer_custom.html is empty
+      // (it is on this site), the else-branch emits the "Just the Docs"
+      // fallback footer. The site doesn't override nav_footer_custom.html,
+      // so the upstream default applies verbatim.
+      `    <footer class="site-footer" aria-label="Site">\n` +
+      `      This site uses <a href="https://github.com/just-the-docs/just-the-docs">Just the Docs</a>, a documentation theme originally for Jekyll.\n` +
+      `    </footer>\n` +
+      `  </div>`,
+    tree: site.navTree,
+    baseurl,
+  };
+}
+
+function renderPageSidebar(sidebar, page) {
+  const open = page.navLevels ? page.navLevels.slice(1) : [];
+  return sidebar.head + renderNavTree(sidebar.tree, [], sidebar.baseurl, open) + sidebar.tail;
+}
+
+/** The whole nav tree's first list, compressed as a page is. */
+export function renderFullNav(site) {
+  return compressHtml(renderNavTree(site.navTree, [], String(site.config.baseurl ?? "")).replace(/\n$/, ""));
+}
+
+/**
+ * /assets/js/nav.js: puts the whole tree in place of a page's part of it.
+ * `navHtml` is `renderFullNav`'s list; in the offline tree its links are
+ * relative to the site's root, and the page's `OFFLINE_SITE_ROOT` goes in
+ * front of each. The help add-in's pane hides the nav, so it is left alone
+ * there.
+ */
+export function navScript(navHtml) {
   return (
-    `  <div class="side-bar">\n` +
-    `    <div class="site-header" role="banner">\n` +
-    `      <a href="${escapeMarkupAndQuotes(relativeUrl("/", baseurl))}" class="site-title lh-tight">${renderSiteTitle(config)}</a>\n` +
-    `      <button id="menu-button" class="site-button btn-reset" aria-label="Toggle menu" aria-expanded="false" aria-controls="site-nav">\n` +
-    `        <svg viewBox="0 0 24 24" class="icon" aria-hidden="true"><use xlink:href="#svg-menu"></use></svg>\n` +
-    `      </button>\n` +
-    `    </div>\n` +
-    `    <nav aria-label="Main" id="site-nav" class="site-nav">` +
-    renderNavTree(site.navTree, [], baseurl) +
-    renderNavExternalLinks(config) +
-    `</nav>\n` +
-    // Upstream sidebar.html: when nav_footer_custom.html is empty
-    // (it is on this site), the else-branch emits the "Just the Docs"
-    // fallback footer. The site doesn't override nav_footer_custom.html,
-    // so the upstream default applies verbatim.
-    `    <footer class="site-footer" aria-label="Site">\n` +
-    `      This site uses <a href="https://github.com/just-the-docs/just-the-docs">Just the Docs</a>, a documentation theme originally for Jekyll.\n` +
-    `    </footer>\n` +
-    `  </div>`
+    `(function () {\n` +
+    `  var nav = document.getElementById("site-nav"), root = window.OFFLINE_SITE_ROOT || "";\n` +
+    `  if (!nav || !nav.firstElementChild || document.documentElement.hasAttribute("data-pane")) return;\n` +
+    `  var html = ${JSON.stringify(navHtml)};\n` +
+    `  nav.firstElementChild.outerHTML = root ? html.replace(/<a href="/g, '<a href="' + root) : html;\n` +
+    `})();\n`
   );
 }
 
@@ -417,10 +459,15 @@ function renderSiteTitle(config) {
 // included file's trailing newline (survives Liquid trim semantics --
 // see test in PLAN-4 §5.4 notes). Compress collapses to one space,
 // producing `</ul> </li>` rather than `</ul></li>`.
-function renderNavTree(nodes, ancestorTitles, baseurl) {
+//
+// `open`, when given, renders only part of the tree: the 1-based positions
+// of the path to expand, one per level (a page's `navLevels` after its
+// first entry). A node off the path keeps its expander but not its list.
+function renderNavTree(nodes, ancestorTitles, baseurl, open) {
   if (!nodes || nodes.length === 0) return `<ul class="nav-list"></ul>\n`;
   let out = `<ul class="nav-list">`;
-  for (const node of nodes) {
+  for (const [i, node] of nodes.entries()) {
+    const rest = !open ? undefined : open[0] === i + 1 ? open.slice(1) : null;
     out += `<li class="nav-list-item">`;
     if (ancestorTitles.includes(node.title)) {
       out += `<a href="${escapeMarkupAndQuotes(relativeUrl(node.url, baseurl))}" class="nav-list-link"> &#8734; </a>`;
@@ -435,8 +482,8 @@ function renderNavTree(nodes, ancestorTitles, baseurl) {
           ` </button>`;
       }
       out += `<a href="${escapeMarkupAndQuotes(relativeUrl(node.url, baseurl))}" class="nav-list-link">${String(node.title)}</a>`;
-      if (hasChildren) {
-        out += renderNavTree(node.children, [...ancestorTitles, node.title], baseurl);
+      if (hasChildren && rest !== null) {
+        out += renderNavTree(node.children, [...ancestorTitles, node.title], baseurl, rest);
       }
     }
     out += `</li>`;
diff --git a/docs/Documentation/Builder.md b/docs/Documentation/Builder.md
index 8c7943537..1237268c5 100644
--- a/docs/Documentation/Builder.md
+++ b/docs/Documentation/Builder.md
@@ -64,7 +64,7 @@ Modules grouped by role. Each entry has one line; deep-dive in [Pipeline Stages]
 | [`worker-pool.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/worker-pool.mjs) | Worker lifecycle wrapper: spawn, send the SAB, forward messages to the scheduler, terminate. No dispatch logic. |
 | [`cpu-worker.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/cpu-worker.mjs) | Worker harness. Runs the pull loop, holds the eight named handlers, handles speculative idle execution. |
 | [`sab-scheduler.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/sab-scheduler.mjs) | SAB layout, allocation, task-metadata API. Constants and atomics primitives consumed by both the scheduler and the workers. |
-| [`sab-broadcast.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/sab-broadcast.mjs) | JSON-over-SAB pack/unpack for the shared payload (config, link tables, sidebar HTML, etc.) broadcast to every render worker. |
+| [`sab-broadcast.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/sab-broadcast.mjs) | JSON-over-SAB pack/unpack for the shared payload (config, link tables, the sidebar and its nav tree, etc.) broadcast to every render worker. |
 
 **Discovery and compute**
 
@@ -96,7 +96,7 @@ Modules grouped by role. Each entry has one line; deep-dive in [Pipeline Stages]
 | [`render.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/render.mjs) | markdown-it configuration + plugin stack + `renderPhase`. Built once on main and once per worker. The plugins worth knowing by name: `svgInlinePlugin` (build-time SVG embedding), `videoLinkPlugin` (a `{: .video }` link becomes a locally vendored poster frame), `remoteImagePlugin` (a user-attachment URL becomes the vendored copy, in both markdown and raw `<img>` syntax), and `headingLevelNormalizePlugin` (renumbers a page that uses h1 and h3 but no h2, so the built page has no heading skip). |
 | [`highlight.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/highlight.mjs) | Shiki bootstrap + the bundled twinBASIC grammar. Emits the just-the-docs wrapper structure. |
 | [`highlight-theme.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/highlight-theme.mjs) | Loads `Light.theme` + `Dark.theme`, emits `tb-highlight.css` + scope-to-class lookup. Clamps any token colour that falls below 4.5:1 against the code-block background --- moving lightness away from the background while preserving hue and saturation --- so highlighted code meets WCAG AA; the emitted rule includes a `raised to 4.5:1` comment naming the original colour. |
-| [`template.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/template.mjs) | `templatePhase` (per-page layout wrap) + `buildInitConfig` + `renderSidebar`. JS template literals; no template engine. Also `injectAnchorHeadings(html, headingsOut)`, which adds the permalink icon to each heading and collects the heading list as it goes, and `renderSectionLinks`, which spends that list on the per-page disclosure at the top of the footer. |
+| [`template.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/template.mjs) | `templatePhase` (per-page layout wrap) + `buildInitConfig` + `renderSidebar`, whose nav holds only the part of the tree a page opens with, + `navScript`, the text of `assets/js/nav.js`, which holds the whole tree. JS template literals; no template engine. Also `injectAnchorHeadings(html, headingsOut)`, which adds the permalink icon to each heading and collects the heading list as it goes, and `renderSectionLinks`, which spends that list on the per-page disclosure at the top of the footer. |
 | [`strftime.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/strftime.mjs) | `formatDate`, the strftime formatter for the footer's "Page last modified" line, written only for a page that sets `last_modified_date`. |
 | [`compress.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/compress.mjs) | Whitespace compression outside `<pre>` blocks. |
 
@@ -116,7 +116,7 @@ Modules grouped by role. Each entry has one line; deep-dive in [Pipeline Stages]
 | File | Role |
 |---|---|
 | [`offline.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/offline.mjs) | Offline-tree writer + just-the-docs.js AST patcher + `search-data.js` wrapper. |
-| [`offline-rewrite.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/offline-rewrite.mjs) | Pure rewrite helpers (`deriveOfflinePageCached`, CSS url() rewrite, site-path set construction). Worker-safe; no node:fs dependency. |
+| [`offline-rewrite.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/offline-rewrite.mjs) | Pure rewrite helpers (`deriveOfflinePage`, CSS url() rewrite, site-path set construction). Worker-safe; no node:fs dependency. |
 | [`pdf.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/pdf.mjs) | `_site-pdf/` writer: `book.html` + `tb-highlight.css` + `print.css` + referenced images. |
 
 **Verification**
@@ -250,7 +250,7 @@ config ┬→ highlighterInit → loadData
 
 - `discover` --- traverses `docs/`, classifies pages vs static files, builds `state.pageByDest`.
 - `vendorAssets` --- finds the YouTube video markers and GitHub user-attachment URLs in the pages, downloads any file not already in `docs/assets/thumbnails/` or `docs/assets/attachments/`, and adds the new files to the static-file copy. `markdownInit` and `writeAssets` both depend on it.
-- `nav` --- builds the sidebar tree, runs the integrity check (orphan / ambiguous `parent:` aborts the build here), pre-renders the sidebar HTML.
+- `nav` --- builds the sidebar tree, runs the integrity check (orphan / ambiguous `parent:` aborts the build here), pre-renders the sidebar around its nav tree. Each page renders its own part of the tree; `writeAssets` writes the whole tree to `assets/js/nav.js`.
 - `dot` (worker) --- regenerates stale `.dot` → `.svg` via the WASM build of Graphviz. WASM init (~50 ms) hides behind the main spine; per-diagram render is synchronous after that.
 - `buildInit` --- pre-renders the config-only chrome (SVG sprites, header, search footer, favicon). No nav-tree dependency; runs in parallel with `nav`.
 - `markdownInit` --- builds the link tables, instantiates the shared markdown-it, computes site-level SEO. The serialized link tables and site-level SEO constants travel to render workers as part of the shared SAB payload.
@@ -279,7 +279,7 @@ dispatch ┬→ render:0 ┬→ flush:0 ┐
 - `prepPageDirs` (main) --- pre-creates every page output directory. Lets `flush:i` skip `mkdir` entirely.
 - `warmInit` (worker, `on_demand` + `unique_per_worker` + `run_when_idle` + `survives_reset`) --- per-lane Shiki bootstrap. The flag combination means workers run it during the main-thread spine if they have no other claimable work, every render-worker needs it on its own lane, and in serve mode the per-lane done flag survives across rebuilds so the second build skips warmup entirely.
 - `renderEnvInit` (worker, `on_demand` + `unique_per_worker`) --- per-lane render environment setup: unpack the shared SAB, reconstruct the link-table Maps, instantiate the worker's own markdown-it. Declared as a `perWorkerDeps` on every `render:i` so the first render claim per lane pulls it in.
-- `render:i` (worker, dynamic) --- the per-chunk compute. Each one runs five sub-stages over its slice of `state.pages`: `renderPhase` (markdown-it body render) → `computeChunkSeo` (per-page SEO fields) → `templatePhase` (just-the-docs layout wrap) → `deriveOfflinePageCached` (offline HTML rewrite) → `deriveSearchEntries` (per-section search entries). Returns a delta containing `renderedContent` per page, plus the per-chunk search entries.
+- `render:i` (worker, dynamic) --- the per-chunk compute. Each one runs five sub-stages over its slice of `state.pages`: `renderPhase` (markdown-it body render) → `computeChunkSeo` (per-page SEO fields) → `templatePhase` (just-the-docs layout wrap) → `deriveOfflinePage` (offline HTML rewrite) → `deriveSearchEntries` (per-section search entries). Returns a delta containing `renderedContent` per page, plus the per-chunk search entries.
 - `renderJoin` (main, `on_demand`) --- barrier that unblocks `searchData`, `symbolIndex` and `writePdf`. `dispatch.submit()` sets its dep count to N *and* rewrites its `expected` list with every chunk name; the dep count alone is not a barrier over the submits. See [Pipeline Stages](Pipeline-Stages#renderjoin-main-on_demand).
 
 ### Write
@@ -293,7 +293,7 @@ dispatch ┬→ render:0 ┬→ flush:0 ┐
 - `searchData` (main) --- concatenates `state.searchChunks` (already populated by each `render:i`'s `submit()`), joins `symbolIndex`'s symbols onto the matching entries by URL (adding the `names` / `qualified` / `primary` fields; see [Site search](Pipeline-Stages#searchdata-main) and `WIP.Search.md`'s "Design" §2), renumbers the global `i` index, and writes `search-data.json`. The heavy work (heading split, content sanitisation, URL encoding) ran on the workers; this task only joins and consolidates. Depends on `renderJoin`, `prepDest` and `symbolIndex` (for the join).
 - `symbolIndex` (main) --- writes `tB/symbols.json`, the [symbol index](Building#the-symbol-index) the IDE help add-in reads, and hands its `symbols` array to `searchData`'s join. Reads the heading ids out of every `/tB/` page's `renderedContent`, joins them with the committed `builder/package-api.json`, and returns the index's URLs for the drift guard that `runBuild` runs once the build is done. Depends on `renderJoin` and `prepDest`; `checkReport` waits for it, because the file is in the online tree's index; `searchData` now waits for it too.
 - `writeAux` (main) --- writes redirect stubs + sitemap + robots.txt. Depends on `writeAssets`, `searchData`, `flushJoin`, `deriveRedirects`, `deriveSitemap`.
-- `writeOffline` (main) --- produces `_site-offline/`. The per-page offline HTML was already computed inside `render:i` and written by `flush:i`, so this task only handles the cross-cutting work: CSS url() rewriting, the just-the-docs.js AST patch, the `search-data.js` wrapper, theme assets, redirect stubs.
+- `writeOffline` (main) --- produces `_site-offline/`. The per-page offline HTML was already computed inside `render:i` and written by `flush:i`, so this task only handles the cross-cutting work: CSS url() rewriting, the just-the-docs.js AST patch, the `search-data.js` wrapper, the offline `nav.js`, theme assets, redirect stubs.
 - `writePdf` (main) --- assembles `_site-pdf/book.html` and copies the images it references. Depends on `flushJoin` (so `renderedContent` is filled), `resolveBookChapters` (so `bookData._chapters` is wired), and `dot` (so diagram SVGs are in `staticFiles`).
 
 ## What runs where
@@ -323,7 +323,7 @@ For a one-page reference, every task and its execution locus:
 Three pieces of work newly distributed to render workers under the current design:
 
 1. **Per-page SEO** (`computeChunkSeo`) --- was a single Phase 2 main-thread task; now runs per chunk inside `render:i`, between `renderPhase` and `templatePhase`. The values are written into the page objects on the worker and travel back as part of the render delta.
-2. **Per-page offline HTML** (`deriveOfflinePageCached`) --- was a Phase 7 main-thread pass that re-read the online tree; now runs per chunk inside `render:i` after `templatePhase`. The resulting `offlineHtml` is stored on the page and written by the matching `flush:i` directly to `_site-offline/`.
+2. **Per-page offline HTML** (`deriveOfflinePage`) --- was a Phase 7 main-thread pass that re-read the online tree; now runs per chunk inside `render:i` after `templatePhase`. The resulting `offlineHtml` is stored on the page and written by the matching `flush:i` directly to `_site-offline/`.
 3. **Per-chunk search entries** (`deriveSearchEntries`) --- was a Phase 6 main-thread task; now runs per chunk inside `render:i`. Each chunk's entries are stored at `state.searchChunks[i]` by the render `submit()`; the `searchData` task flattens them, joins `symbolIndex`'s symbols onto the matching entries by URL, renumbers, and writes the JSON.
 
 Per-chunk page HTML writes were similarly pulled off the main thread: each `flush:i` writes its chunk's pages to disk on the same worker that rendered them, with the pinning enforced by `pin_to_predecessor`.
@@ -354,7 +354,7 @@ Worker output flow: a worker posts `{ done: taskIdx, output, timing, lane }` to
 `dispatch.execute()` runs on the main thread and assembles two SAB payloads:
 
 - **Per-task payload SAB** --- one JSON blob per `render:i`, each containing the chunk's `Page` objects. `chunkOffset[i]` / `chunkLength[i]` index into the buffer.
-- **Shared payload SAB** --- one JSON blob broadcast to every worker, containing the site config, site-level SEO constants, pre-rendered sidebar + chrome (`initData`), serialized link tables (`[key, permalink]` pair arrays), the static-file relative-path set, the baseurl, the site-paths set for offline rewriting, the `offline_exclude` patterns, and the `skipOffline` flag.
+- **Shared payload SAB** --- one JSON blob broadcast to every worker, containing the site config, site-level SEO constants, the pre-rendered sidebar, its nav tree and the chrome (`initData`), serialized link tables (`[key, permalink]` pair arrays), the static-file relative-path set, the baseurl, the site-paths set for offline rewriting, the `offline_exclude` patterns, and the `skipOffline` flag.
 
 `dispatch.submit()` allocates 2N dynamic slots from the generic pool in `sab-scheduler.mjs`, writes their handler IDs and per-worker dep lists, wires the successor edges, pins each `flush:i` to its `render:i`, calls `broadcastDynamicData(payloadSAB, sharedSAB)` (one `postMessage` per worker carrying the two SAB references --- shared memory, not cloned), and finally flips the `render:i` slots to `READY`. Workers see the new tasks on their next scan.
 
@@ -365,7 +365,7 @@ Each `render:i` runs five sub-stages over its chunk:
 1. `renderPhase(chunk, env.site)` --- the markdown-it body render.
 2. `computeChunkSeo(chunk, env.site.seoSiteTitle, env.site.config, env.site.markdown)` --- per-page SEO fields.
 3. `templatePhase(chunk, env.site, env.initData)` --- just-the-docs layout wrap. `env.initData` is the pre-rendered chrome from `dispatch`.
-4. Offline rewrite (when `!skipOffline`) --- per destination directory, render the first page through `deriveOfflinePage` and slice out the nav block. Subsequent pages in the same directory substitute the sliced nav with a cached output, run the rewriter over the smaller string, and splice the output back in. Saves ~200 ms across the build.
+4. Offline rewrite (when `!skipOffline`) --- each page through `deriveOfflinePage`.
 5. `deriveSearchEntries(chunk, env.site)` --- per-section search-index entries.
 
 The worker stores the writable pages on its own `_pendingFlush` FIFO and returns the deltas. The matching `flush:i` --- pinned to this lane --- claims later, pops the batch, and writes the page HTML to disk. The pinning is what guarantees the batch lands on the right worker; the FIFO is what handles the case where a worker has already started a second `render:i` before its first `flush:i` claims.
@@ -492,7 +492,7 @@ The site's `/assets/` tree at deploy time is assembled from three sources:
 |---|---|---|
 | `docs/assets/` | Project-owned content: the two SCSS entry points, project JS (`theme-toggle.js`, `svg-inline.js`), hand-written stylesheets (`print.css`, `just-the-docs-head-nav.css`), Graphviz/DOT diagrams (`.dot` sources + `.svg` renders), the self-hosted webfaces under `fonts/` (subset `.woff2` plus their OFL licences), and any content images contributors add. | Discovered by [`discover.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/discover.mjs), copied by `writeAssets`. |
 | `builder/vendor/just-the-docs/` | Vendored from the just-the-docs theme (v0.10.1), and patched in tree rather than held pristine: `_sass/` (the theme's SCSS sources, fed into the compilation --- 30 of its files differ from the v0.10.1 originals) and `assets/js/just-the-docs.js` (also patched) + `assets/js/vendor/lunr.min.js` (unmodified); both JS files are copied verbatim into the output. See [`builder/vendor/just-the-docs/README.md`](https://github.com/twinbasic/documentation/blob/main/builder/vendor/just-the-docs/README.md) for the file-by-file inventory, the re-vendoring procedure, and the in-tree patches --- which cover `_sass/` as well as `just-the-docs.js`. | `_sass/` consumed by [`scss.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/scss.mjs); `assets/` copied by `writeAssets`. |
-| Generated in-process | `just-the-docs-combined.css` (from `scss.mjs`, over the two entry points plus every partial under `docs/_sass/` --- see [Project styling](#project-styling)) and `tb-highlight.css` (from `highlight-theme.mjs`). Neither is committed; both are rebuilt every run. | Written by `scss` (combined CSS) and `writeAssets` (highlight CSS). |
+| Generated in-process | `just-the-docs-combined.css` (from `scss.mjs`, over the two entry points plus every partial under `docs/_sass/` --- see [Project styling](#project-styling)) and `tb-highlight.css` (from `highlight-theme.mjs`), and `assets/js/nav.js` (from `template.mjs`'s `navScript`). None is committed; all are rebuilt every run. | Written by `scss` (combined CSS) and `writeAssets` (highlight CSS, `nav.js`). |
 
 The fonts are committed artifacts, like the DOT renders: `scripts/build_fonts.py` regenerates them from pinned upstream releases, and the build neither downloads nor subsets anything. The stylesheets reference them with a *relative* `url("../fonts/...")` rather than a root-absolute path, so the same compiled CSS resolves in the online tree, the `file://` offline mirror, a `--baseurl` deployment and the sparse PDF tree without any rewrite. `builder/pdf.mjs` copies the six faces `print.css` declares into `_site-pdf/` explicitly, since that tree is sparse and carries only what the book render needs.
 
@@ -500,6 +500,8 @@ CSS files in either copy path get a baseurl rewrite (`url("/path")` → `url("<b
 
 The project JS is deliberately small. `theme-toggle.js` implements the three-state (system / light / dark) theme switch as a progressive enhancement over the no-JS `prefers-color-scheme` default: the correct palette renders even with scripting disabled, and the script only adds the manual override that persists a `data-theme` choice. A page opened with `?theme=light` or `?theme=dark` takes that theme instead, as do the pages reached from it in the same tab, without changing the reader's stored choice; the IDE's help add-in passes the IDE's theme this way. It also passes `?pane=1`, which the same early script keeps for the tab and which hides the sidebar and the header, so that its narrow pane shows the page alone. `svg-inline.js` powers the click-to-zoom overlay and the download / copy controls on inlined diagrams.
 
+The sidebar's whole nav tree is in `nav.js`, which the build writes. A page holds only the part of the tree that shows when it opens: the top level, and the children of the page and of each of its ancestors. Without that, the tree would be most of every page's bytes. `nav.js` is loaded right after the nav and puts the whole tree in its place before the theme's script marks the current page, so the sidebar works as before; without scripting it still shows that part. In the offline tree its links are relative to the site's root, and the script puts the page's path to the root in front of each. In the help add-in's pane, which hides the sidebar, it does nothing.
+
 ## Project styling
 
 **Every hand-written style rule the project owns lives under `docs/_sass/`.** A CSS rule for a new component goes there --- not into the vendored theme sources under `builder/vendor/just-the-docs/_sass/`, and not into a new stylesheet of its own. Everything under `docs/_sass/` compiles into one asset, `assets/css/just-the-docs-combined.css`, which is the stylesheet every page loads.
diff --git a/docs/Documentation/Extending.md b/docs/Documentation/Extending.md
index cc757073d..ecfd2b64d 100644
--- a/docs/Documentation/Extending.md
+++ b/docs/Documentation/Extending.md
@@ -576,7 +576,7 @@ chunk = parseFromPayloadSAB(taskIdx)
 await renderPhase(chunk, env.site)              // markdown-it body render
 computeChunkSeo(chunk, ...)                     // per-page SEO fields
 await templatePhase(chunk, env.site, ...)       // layout wrap
-if (env.offlineBase) { … deriveOfflinePageCached per page … }
+if (env.offlineBase) { … deriveOfflinePage per page … }
 searchEntries = deriveSearchEntries(chunk, env.site)
 return { pages: chunk.map(…), searchEntries }
 ```
diff --git a/docs/Documentation/Pipeline-Stages.md b/docs/Documentation/Pipeline-Stages.md
index c6ebd568a..052890f86 100644
--- a/docs/Documentation/Pipeline-Stages.md
+++ b/docs/Documentation/Pipeline-Stages.md
@@ -37,7 +37,7 @@ The pipeline passes three pieces of mutable state through every task: the `pages
 | `layoutDefault` | `discover` | `boolean` | `true` when frontmatter has no explicit `layout:` key. |
 | `imageScope` | `discover` | `boolean` | `true` when `srcRel` contains an `Images/` segment. Phase 3 uses this to validate image paths. |
 | `navPath` | `nav` | `string` | Slash-joined nav chain: `grand_parent / parent / title`. Set only on pages with a non-empty title. |
-| `navLevels` | `nav` | `object` | Positional indices in the sidebar tree. `templatePhase` uses this to generate per-page activation CSS. |
+| `navLevels` | `nav` | `object` | Positional indices in the sidebar tree. `templatePhase` uses this to generate per-page activation CSS and to choose the part of the nav tree the page holds. |
 | `breadcrumbs` | `nav` | `Page[]` | Ancestor chain from the root to the current page, nearest-first. |
 | `children` | `nav` | `Page[]` | Immediate child pages in nav order. |
 | `renderedContent` | `render:i` | `string` | HTML body produced by markdown-it. Set on the worker, merged back into the master page via the render delta. |
@@ -47,9 +47,9 @@ The pipeline passes three pieces of mutable state through every task: the `pages
 | `seoCanonical` | `render:i` (`computeChunkSeo`) | `string` | Absolute canonical URL. |
 | `seoIsHome` | `render:i` (`computeChunkSeo`) | `boolean` | `true` when the page's permalink is a known home-page URL. |
 | `html` | `render:i` (`templatePhase`) | `string` | Complete HTML document, ready to write to disk. Absent on `layout: book-combined` pages, which `writePdf` owns. |
-| `offlineHtml` | `render:i` (`deriveOfflinePageCached`) | `string\|undefined` | Pre-computed offline HTML for the page, with every absolute URL rewritten to a page-relative path. Set after `templatePhase` when `!skipOffline`. |
+| `offlineHtml` | `render:i` (`deriveOfflinePage`) | `string\|undefined` | Pre-computed offline HTML for the page, with every absolute URL rewritten to a page-relative path. Set after `templatePhase` when `!skipOffline`. |
 | `hasSvg` | `render:i` (`svgInlinePlugin`) | `boolean\|undefined` | `true` when the page contains at least one inlined SVG. `templatePhase` uses this to conditionally include the `svg-inline.js` script. |
-| `offlineMisses` | `render:i` (`deriveOfflinePageCached`) | `number\|undefined` | Count of URLs that could not be resolved during the per-page offline rewrite. Aggregated by `flushJoin`. |
+| `offlineMisses` | `render:i` (`deriveOfflinePage`) | `number\|undefined` | Count of URLs that could not be resolved during the per-page offline rewrite. Aggregated by `flushJoin`. |
 
 ### Site object (`site`)
 
@@ -206,7 +206,7 @@ nav.expected = ["discover"]
 nav.execute() → { sidebar }
 ```
 
-Calls `computeNav(state.pages, state.site.config)` from `nav.mjs`, then `renderSidebar(state.site)` from `template.mjs`. The nav-integrity check runs inside `computeNav` and throws on orphan or ambiguous `parent:` declarations. Returns the pre-rendered sidebar HTML for `dispatch` to fold into the shared payload.
+Calls `computeNav(state.pages, state.site.config)` from `nav.mjs`, then `renderSidebar(state.site)` from `template.mjs`. The nav-integrity check runs inside `computeNav` and throws on orphan or ambiguous `parent:` declarations. Returns the sidebar as the HTML around the nav tree and the tree itself, for `dispatch` to fold into the shared payload; each page renders its own part of the tree.
 
 ### `dot` (worker)
 
@@ -326,7 +326,7 @@ Handler (`render` in `cpu-worker.mjs`):
 2. `await renderPhase(chunk, env.site)` --- markdown-it body render.
 3. `computeChunkSeo(chunk, env.site.seoSiteTitle, env.site.config, env.site.markdown)` --- per-page SEO fields.
 4. `await templatePhase(chunk, env.site, env.initData)` --- just-the-docs layout wrap.
-5. When `env.offlineBase` is set: per-destination-directory, render the first page through `deriveOfflinePage` and slice the nav block via `sliceNavBlock`; cache the input/output nav slices keyed by directory; for each writable page, call `deriveOfflinePageCached` which substitutes the cached nav, runs the rewriter over the smaller string, and splices the output back in. Saves ~200 ms of repeated nav rewriting.
+5. When `env.offlineBase` is set: call `deriveOfflinePage` for each writable page.
 6. Store `{ destPath, html, offlineHtml, offlineMisses }` on the worker's `_pendingFlush` FIFO so the matching `flush:i` can drain it.
 7. `deriveSearchEntries(chunk, env.site)` --- per-section search entries, with any [index entries](Authoring#index-entries-for-the-site-search) the page's frontmatter or headings name. Trim `sourcePage` and the chunk-local `i` before returning (main reassigns global indices).
 
@@ -405,7 +405,7 @@ Aggregates per-chunk write stats. Unblocks `writeAux`, `writePdf` and `linkJoin`
 writeAssets.expected = ["dot", "vendorAssets", "prepPageDirs", "highlighterInit"]
 ```
 
-Calls `writePhase(state.pages, state.staticFiles, { destRoot, dryRun, generatedAssets, baseurl, skipPages: true })` from `write.mjs`. Copies vendored theme JS, copies project static files, writes generated CSS (`tb-highlight.css` from `state.site.highlightCss`). **Does not** write page HTML --- the per-chunk `flush:i` tasks already did that. The CSS baseurl rewrite (`url("/path")` → `url("<baseurl>/path")`) applies to both copy paths and to generated assets.
+Calls `writePhase(state.pages, state.staticFiles, { destRoot, dryRun, generatedAssets, baseurl, skipPages: true })` from `write.mjs`. Copies vendored theme JS, copies project static files, writes generated assets (`tb-highlight.css` from `state.site.highlightCss`, and `assets/js/nav.js`, the whole nav tree). **Does not** write page HTML --- the per-chunk `flush:i` tasks already did that. The CSS baseurl rewrite (`url("/path")` → `url("<baseurl>/path")`) applies to both copy paths and to generated assets.
 
 ### `searchData` (main)
 
@@ -445,7 +445,7 @@ Returns `{ redirectStats, sitemapStats, searchStats }` (the search stats pass th
 writeOffline.expected = ["writeAux", "writeAssets"]
 ```
 
-Calls `writeOffline(state.staticFiles, state.site, destRoot, { auxStats, sitePaths, profileOffline })` from `offline.mjs`. Per-page HTML is already rewritten and written to disk inside `render:i` / `flush:i`. This task handles the cross-cutting work: CSS `url()` rewriting, the `just-the-docs.js` AST patch (`deriveOfflineJtdJs`), the `search-data.js` wrapper (`deriveOfflineSearchDataJs`), theme assets, redirect stubs. Reads `sitePaths` from `state.sitePaths` (computed by `dispatch`).
+Calls `writeOffline(state.staticFiles, state.site, destRoot, { auxStats, sitePaths, profileOffline })` from `offline.mjs`. Per-page HTML is already rewritten and written to disk inside `render:i` / `flush:i`. This task handles the cross-cutting work: CSS `url()` rewriting, the `just-the-docs.js` AST patch (`deriveOfflineJtdJs`), the `search-data.js` wrapper (`deriveOfflineSearchDataJs`), the offline `nav.js` (the whole nav tree with its links relative to the site's root), theme assets, redirect stubs. Reads `sitePaths` from `state.sitePaths` (computed by `dispatch`).
 
 ### `writePdf` (main)
 
@@ -771,7 +771,9 @@ For **renderer rules**, order inverts. Both image plugins capture the current `m
 | `templatePhase` | `(pages, site, initData) → Promise<void>` | Wraps each page's `renderedContent` in the just-the-docs layout, runs `compressHtml`, stores the result in `page.html`. Skips `layout: book-combined`. |
 | `buildInitConfig` | `(site) → object` | Pre-renders the config-only chrome (SVG sprites, header, search footer, favicon, GA). Called by the `buildInit` task. |
 | `buildInitFn` | (alias of internal `buildInit`) | Available for harnesses; combines `buildInitConfig` + `renderSidebar` in one call. |
-| `renderSidebar` | `(site) → string` | Pre-renders the sidebar HTML. Called by the `nav` task; the output is folded into the shared payload by `dispatch`. |
+| `renderSidebar` | `(site) → { head, tail, tree, baseurl }` | Pre-renders the sidebar around its nav tree. Called by the `nav` task; the output is folded into the shared payload by `dispatch`, and `templatePhase` renders each page's part of the tree between `head` and `tail`. |
+| `renderFullNav` | `(site) → string` | The whole nav tree's list, compressed as a page is. |
+| `navScript` | `(navHtml) → string` | The text of `assets/js/nav.js`, which puts the whole tree in place of a page's part of it. |
 | `navActivationCss` | `(page) → string` | Per-page `<style id="jtd-nav-activation">` block. |
 | `injectAnchorHeadings` | `(html, headingsOut) → string` | Adds `<a class="anchor-heading">` next to every heading with an `id` outside `<code>` and `<pre>`, and pushes each heading onto `headingsOut` as it goes. The icon is deliberately `aria-hidden="true" tabindex="-1"`; the keyboard and screen-reader equivalent is the per-page `<details class="section-links">` block that `renderFooter` builds from `headingsOut`. |
 
@@ -887,8 +889,6 @@ Pure-compute rewrite helpers extracted from `offline.mjs` so they can be importe
 |---|---|---|
 | `buildSitePathsSync` | `(pages, staticFiles, excludePatterns, stubs, themeAssetRels) → Set<string>` | Builds the URL resolver's site-paths Set synchronously, from an explicit theme-asset list rather than traversing `_site/assets/`. Used by `dispatch`. |
 | `deriveOfflinePage` | `(page, state) → { html, misses }` | Rewrites one page's HTML for offline use: strips SEO metadata, rewrites every absolute URL to a page-relative path, injects the offline search setup script. |
-| `deriveOfflinePageCached` | `(page, deps) → { html, misses }` | Cached variant. Uses `state.navCache` to substitute the pre-rewritten sidebar nav block, avoiding a full regex pass over the ~80 KB sidebar on each page. |
-| `sliceNavBlock` | `(html) → { before, nav, after } \| null` | Splits a page's HTML into the segments before, within, and after the sidebar nav block. |
 | `deriveOfflineCss` | `(cssIn, themeRel, state) → { css, misses }` | Rewrites `url()` references in a CSS file to page-relative paths. |
 | `deriveOfflineRedirect` | `(stub, state) → string` | Rewrites a redirect stub's HTML for offline use. |
 | `offlineExcluded` | `(rel, patterns) → boolean` | Returns `true` when a site-relative path matches any `offline_exclude` glob from `_config.yml`. |

From 5b3994943f58f6aef353b27ff3eedaebe9760c3e Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 11:42:12 +0200
Subject: [PATCH 02/42] BUGS: file lset-long-codegen-error,
 lset-variant-array-element-noop.

---
 BUGS-TO-REPORT.md                             |  65 ------------------
 bugs/filed/lset-long-codegen-error/REPORT.md  |  32 +++++++++
 .../lset-long-codegen-error.twinproj          | Bin
 .../lset-long-codegen-error/repro.json        |   3 +-
 .../lset-long-codegen-error/src/Settings      |   0
 .../src/Sources/Startup.twin                  |   0
 .../lset-long-codegen-error/vb6/Module1.bas   |   0
 .../lset-long-codegen-error/vb6/Probe.vbp     |   0
 .../lset-variant-array-element-noop/REPORT.md |  31 +++++++++
 .../lset-variant-array-element-noop.twinproj  | Bin
 .../repro.json                                |   3 +-
 .../src/Settings                              |   0
 .../src/Sources/Startup.twin                  |   0
 .../vb6/Module1.bas                           |   0
 .../vb6/Probe.vbp                             |   0
 15 files changed, 67 insertions(+), 67 deletions(-)
 create mode 100644 bugs/filed/lset-long-codegen-error/REPORT.md
 rename bugs/{ => filed}/lset-long-codegen-error/lset-long-codegen-error.twinproj (100%)
 rename bugs/{ => filed}/lset-long-codegen-error/repro.json (78%)
 rename bugs/{ => filed}/lset-long-codegen-error/src/Settings (100%)
 rename bugs/{ => filed}/lset-long-codegen-error/src/Sources/Startup.twin (100%)
 rename bugs/{ => filed}/lset-long-codegen-error/vb6/Module1.bas (100%)
 rename bugs/{ => filed}/lset-long-codegen-error/vb6/Probe.vbp (100%)
 create mode 100644 bugs/filed/lset-variant-array-element-noop/REPORT.md
 rename bugs/{ => filed}/lset-variant-array-element-noop/lset-variant-array-element-noop.twinproj (100%)
 rename bugs/{ => filed}/lset-variant-array-element-noop/repro.json (94%)
 rename bugs/{ => filed}/lset-variant-array-element-noop/src/Settings (100%)
 rename bugs/{ => filed}/lset-variant-array-element-noop/src/Sources/Startup.twin (100%)
 rename bugs/{ => filed}/lset-variant-array-element-noop/vb6/Module1.bas (100%)
 rename bugs/{ => filed}/lset-variant-array-element-noop/vb6/Probe.vbp (100%)

diff --git a/BUGS-TO-REPORT.md b/BUGS-TO-REPORT.md
index 7cc82db9e..1be9c9b2f 100644
--- a/BUGS-TO-REPORT.md
+++ b/BUGS-TO-REPORT.md
@@ -1521,71 +1521,6 @@ What was tried: BETA 983 prints the same two lines. Assigning the same long text
 
 ---
 
-## `LSet` on a `Long` variable compiles, and the build fails with a codegen error
-
-**Describe the bug**
-`LSet` is defined for a string or a user-defined type. A statement `LSet n = "ab"` with `n` declared `As Long` is accepted by the compiler without a diagnostic, and building the project then fails: the linker reports a code-generation error at the statement, and no exe is produced. Run from the IDE (F5), the project stops the same way. Observed in a build of the reproducer project.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `lset-long-codegen-error.twinproj` (attached as `lset-long-codegen-error.zip`). Its one source file, `Startup.twin`, is a `Sub Main` with `Dim n As Long` and `LSet n = "ab"`.
-2. Compile it: no errors, warnings or hints.
-3. Build it (Build, or F5) and read the DEBUG CONSOLE:
-   ```
-   [BUILD] Starting...
-   [LINKER] compilation (codegen) error detected in 'Startup.Mainrootmain' at line #5
-   [LINKER] FAILED due to compilation errors 'LsetLongCodegenError_win32.exe'
-   [BUILD] failed
-   ```
-
-**Expected behavior**
-A compile error on the `LSet` line, as for the neighbouring wrong operands: `LSet s = a` with `a` a user-defined type and `RSet a = b` with user-defined types are refused with TB5001 (*unable to convert type ... to String*), and `LSet a = s` with a string source and a user-defined type destination is refused with TB5249. VB6 refuses this statement at compile time with *LSet allowed only on strings and user-defined types* (attached as `lset-long-codegen-error-vb6.zip`, which does not build).
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-Severity: low. The error is reported, so nothing runs wrongly, but it points at no cause, and the compile step that the IDE shows while typing says the project is fine.
-
-Tried with a `Long` destination only. The same on BETA 983.
-
-<!-- Reproducer: bugs/lset-long-codegen-error/ (mode build, expects tbbuild exit 5 and "codegen" in the message); verified on 995 and 983. The BUGS tool's `vb6` command prints VB6's compile error and exits 1 for it, which is the comparison. No page states it: docs/Reference/Core/LSet.md says nothing about other destinations. -->
-
----
-
-## `LSet` and `RSet` on an element of a `Variant` that holds an array change nothing
-
-**Describe the bug**
-`LSet v(0) = "zz"` and `RSet v(1) = "zz"` do nothing when `v` is a `Variant` that holds an array, whether the array came from `Array(...)` or from `ReDim v(0 To 1)` on the `Variant`. The statements raise no error, and the element keeps its value. The same statements on an element of an array declared `Dim w(0 To 1) As Variant` work. Observed in a run of the reproducer project.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `lset-variant-array-element-noop.twinproj` (attached as `lset-variant-array-element-noop.zip`). Its one source file, `Startup.twin`, has a `Sub Main` that assigns `v = Array("0123456789", "abcde")`, runs `LSet v(0) = "zz"` and `RSet v(1) = "zz"`, and does the same to the elements of `Dim w(0 To 1) As Variant`.
-2. Run it (F5) and read the DEBUG CONSOLE:
-   ```
-   LSet v(0), v = Array(...):   [0123456789]
-   RSet v(1), v = Array(...):   [abcde]
-   LSet w(0), w(0 To 1) As Variant: [zz        ]
-   RSet w(1), w(0 To 1) As Variant: [   zz]
-   ```
-
-**Expected behavior**
-The elements of `v` change as those of `w` do: `[zz        ]` and `[   zz]`. VB6 does so (attached as `lset-variant-array-element-noop-vb6.zip`).
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-Severity: low to medium. A statement that has no effect and no error is easy to miss.
-
-Tried: `ReDim v2(0 To 1)` on a `Variant`, then `LSet v2(0) = "zz"`, does the same. The `w` elements and `Dim a(0 To 2) As String` elements work. On BETA 983 the `v` lines read the same, and the `w` line for `LSet` reads `[zz23456789]`, because `LSet` did not yet fill with spaces there (fixed in BETA 984, which is a separate matter).
-
-<!-- Reproducer: bugs/lset-variant-array-element-noop/ (mode run, expects the four lines above); verified on 995, 983 gives the same `v` lines. docs/Reference/Core/LSet.md and RSet.md each carry a WARNING naming BETA 995 for this, after the paragraph that says the destination can be a Variant that holds a string; when fixed, replace each with a NOTE saying since which build. -->
-
----
-
 ## `LSet` and `RSet` on a `Variant` destination raise 13 for `Null` and for an object, and pad a `Boolean` as `-1`
 
 **Describe the bug**
diff --git a/bugs/filed/lset-long-codegen-error/REPORT.md b/bugs/filed/lset-long-codegen-error/REPORT.md
new file mode 100644
index 000000000..2de286edf
--- /dev/null
+++ b/bugs/filed/lset-long-codegen-error/REPORT.md
@@ -0,0 +1,32 @@
+Filed as [twinbasic/twinbasic#2466](https://github.com/twinbasic/twinbasic/issues/2466).
+
+## `LSet` on a `Long` variable compiles, and the build fails with a codegen error
+
+**Describe the bug**
+`LSet` is defined for a string or a user-defined type. A statement `LSet n = "ab"` with `n` declared `As Long` is accepted by the compiler without a diagnostic, and building the project then fails: the linker reports a code-generation error at the statement, and no exe is produced. Run from the IDE (F5), the project stops the same way. Observed in a build of the reproducer project.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `lset-long-codegen-error.twinproj` (attached as `lset-long-codegen-error.zip`). Its one source file, `Startup.twin`, is a `Sub Main` with `Dim n As Long` and `LSet n = "ab"`.
+2. Compile it: no errors, warnings or hints.
+3. Build it (Build, or F5) and read the DEBUG CONSOLE:
+   ```
+   [BUILD] Starting...
+   [LINKER] compilation (codegen) error detected in 'Startup.Mainrootmain' at line #5
+   [LINKER] FAILED due to compilation errors 'LsetLongCodegenError_win32.exe'
+   [BUILD] failed
+   ```
+
+**Expected behavior**
+A compile error on the `LSet` line, as for the neighbouring wrong operands: `LSet s = a` with `a` a user-defined type and `RSet a = b` with user-defined types are refused with TB5001 (*unable to convert type ... to String*), and `LSet a = s` with a string source and a user-defined type destination is refused with TB5249. VB6 refuses this statement at compile time with *LSet allowed only on strings and user-defined types* (attached as `lset-long-codegen-error-vb6.zip`, which does not build).
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 995
+
+**Additional context**
+Severity: low. The error is reported, so nothing runs wrongly, but it points at no cause, and the compile step that the IDE shows while typing says the project is fine.
+
+Tried with a `Long` destination only. The same on BETA 983.
+
+<!-- Reproducer: bugs/lset-long-codegen-error/ (mode build, expects tbbuild exit 5 and "codegen" in the message); verified on 995 and 983. The BUGS tool's `vb6` command prints VB6's compile error and exits 1 for it, which is the comparison. No page states it: docs/Reference/Core/LSet.md says nothing about other destinations. -->
diff --git a/bugs/lset-long-codegen-error/lset-long-codegen-error.twinproj b/bugs/filed/lset-long-codegen-error/lset-long-codegen-error.twinproj
similarity index 100%
rename from bugs/lset-long-codegen-error/lset-long-codegen-error.twinproj
rename to bugs/filed/lset-long-codegen-error/lset-long-codegen-error.twinproj
diff --git a/bugs/lset-long-codegen-error/repro.json b/bugs/filed/lset-long-codegen-error/repro.json
similarity index 78%
rename from bugs/lset-long-codegen-error/repro.json
rename to bugs/filed/lset-long-codegen-error/repro.json
index d43c1f71d..8d13680da 100644
--- a/bugs/lset-long-codegen-error/repro.json
+++ b/bugs/filed/lset-long-codegen-error/repro.json
@@ -3,5 +3,6 @@
   "expect": {
     "exit": 5,
     "message": "codegen"
-  }
+  },
+  "issue": 2466
 }
diff --git a/bugs/lset-long-codegen-error/src/Settings b/bugs/filed/lset-long-codegen-error/src/Settings
similarity index 100%
rename from bugs/lset-long-codegen-error/src/Settings
rename to bugs/filed/lset-long-codegen-error/src/Settings
diff --git a/bugs/lset-long-codegen-error/src/Sources/Startup.twin b/bugs/filed/lset-long-codegen-error/src/Sources/Startup.twin
similarity index 100%
rename from bugs/lset-long-codegen-error/src/Sources/Startup.twin
rename to bugs/filed/lset-long-codegen-error/src/Sources/Startup.twin
diff --git a/bugs/lset-long-codegen-error/vb6/Module1.bas b/bugs/filed/lset-long-codegen-error/vb6/Module1.bas
similarity index 100%
rename from bugs/lset-long-codegen-error/vb6/Module1.bas
rename to bugs/filed/lset-long-codegen-error/vb6/Module1.bas
diff --git a/bugs/lset-long-codegen-error/vb6/Probe.vbp b/bugs/filed/lset-long-codegen-error/vb6/Probe.vbp
similarity index 100%
rename from bugs/lset-long-codegen-error/vb6/Probe.vbp
rename to bugs/filed/lset-long-codegen-error/vb6/Probe.vbp
diff --git a/bugs/filed/lset-variant-array-element-noop/REPORT.md b/bugs/filed/lset-variant-array-element-noop/REPORT.md
new file mode 100644
index 000000000..e509eb70f
--- /dev/null
+++ b/bugs/filed/lset-variant-array-element-noop/REPORT.md
@@ -0,0 +1,31 @@
+Filed as [twinbasic/twinbasic#2467](https://github.com/twinbasic/twinbasic/issues/2467).
+
+## `LSet` and `RSet` on an element of a `Variant` that holds an array change nothing
+
+**Describe the bug**
+`LSet v(0) = "zz"` and `RSet v(1) = "zz"` do nothing when `v` is a `Variant` that holds an array, whether the array came from `Array(...)` or from `ReDim v(0 To 1)` on the `Variant`. The statements raise no error, and the element keeps its value. The same statements on an element of an array declared `Dim w(0 To 1) As Variant` work. Observed in a run of the reproducer project.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `lset-variant-array-element-noop.twinproj` (attached as `lset-variant-array-element-noop.zip`). Its one source file, `Startup.twin`, has a `Sub Main` that assigns `v = Array("0123456789", "abcde")`, runs `LSet v(0) = "zz"` and `RSet v(1) = "zz"`, and does the same to the elements of `Dim w(0 To 1) As Variant`.
+2. Run it (F5) and read the DEBUG CONSOLE:
+   ```
+   LSet v(0), v = Array(...):   [0123456789]
+   RSet v(1), v = Array(...):   [abcde]
+   LSet w(0), w(0 To 1) As Variant: [zz        ]
+   RSet w(1), w(0 To 1) As Variant: [   zz]
+   ```
+
+**Expected behavior**
+The elements of `v` change as those of `w` do: `[zz        ]` and `[   zz]`. VB6 does so (attached as `lset-variant-array-element-noop-vb6.zip`).
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 995
+
+**Additional context**
+Severity: low to medium. A statement that has no effect and no error is easy to miss.
+
+Tried: `ReDim v2(0 To 1)` on a `Variant`, then `LSet v2(0) = "zz"`, does the same. The `w` elements and `Dim a(0 To 2) As String` elements work. On BETA 983 the `v` lines read the same, and the `w` line for `LSet` reads `[zz23456789]`, because `LSet` did not yet fill with spaces there (fixed in BETA 984, which is a separate matter).
+
+<!-- Reproducer: bugs/lset-variant-array-element-noop/ (mode run, expects the four lines above); verified on 995, 983 gives the same `v` lines. docs/Reference/Core/LSet.md and RSet.md each carry a WARNING naming BETA 995 for this, after the paragraph that says the destination can be a Variant that holds a string; when fixed, replace each with a NOTE saying since which build. -->
diff --git a/bugs/lset-variant-array-element-noop/lset-variant-array-element-noop.twinproj b/bugs/filed/lset-variant-array-element-noop/lset-variant-array-element-noop.twinproj
similarity index 100%
rename from bugs/lset-variant-array-element-noop/lset-variant-array-element-noop.twinproj
rename to bugs/filed/lset-variant-array-element-noop/lset-variant-array-element-noop.twinproj
diff --git a/bugs/lset-variant-array-element-noop/repro.json b/bugs/filed/lset-variant-array-element-noop/repro.json
similarity index 94%
rename from bugs/lset-variant-array-element-noop/repro.json
rename to bugs/filed/lset-variant-array-element-noop/repro.json
index 96b80ba1f..3f63cb0af 100644
--- a/bugs/lset-variant-array-element-noop/repro.json
+++ b/bugs/filed/lset-variant-array-element-noop/repro.json
@@ -8,5 +8,6 @@
       "^LSet w\\(0\\), w\\(0 To 1\\) As Variant: \\[zz        \\]$",
       "^RSet w\\(1\\), w\\(0 To 1\\) As Variant: \\[   zz\\]$"
     ]
-  }
+  },
+  "issue": 2467
 }
diff --git a/bugs/lset-variant-array-element-noop/src/Settings b/bugs/filed/lset-variant-array-element-noop/src/Settings
similarity index 100%
rename from bugs/lset-variant-array-element-noop/src/Settings
rename to bugs/filed/lset-variant-array-element-noop/src/Settings
diff --git a/bugs/lset-variant-array-element-noop/src/Sources/Startup.twin b/bugs/filed/lset-variant-array-element-noop/src/Sources/Startup.twin
similarity index 100%
rename from bugs/lset-variant-array-element-noop/src/Sources/Startup.twin
rename to bugs/filed/lset-variant-array-element-noop/src/Sources/Startup.twin
diff --git a/bugs/lset-variant-array-element-noop/vb6/Module1.bas b/bugs/filed/lset-variant-array-element-noop/vb6/Module1.bas
similarity index 100%
rename from bugs/lset-variant-array-element-noop/vb6/Module1.bas
rename to bugs/filed/lset-variant-array-element-noop/vb6/Module1.bas
diff --git a/bugs/lset-variant-array-element-noop/vb6/Probe.vbp b/bugs/filed/lset-variant-array-element-noop/vb6/Probe.vbp
similarity index 100%
rename from bugs/lset-variant-array-element-noop/vb6/Probe.vbp
rename to bugs/filed/lset-variant-array-element-noop/vb6/Probe.vbp

From efaf288c194fd1ae97c3f8ef0463c6e79d9ff7ad Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 11:48:54 +0200
Subject: [PATCH 03/42] Online pages hold the whole nav tree again and the
 online tree has no nav.js; only offline pages hold their part of the tree,
 cut in render:i by withPartialNav

---
 builder/check-tree.mjs                |  5 +-
 builder/cpu-worker.mjs                |  7 +-
 builder/offline.mjs                   |  5 +-
 builder/tbdocs.mjs                    | 15 +++--
 builder/template.mjs                  | 97 +++++++++++++++------------
 docs/Documentation/Builder.md         | 18 ++---
 docs/Documentation/Pipeline-Stages.md | 13 ++--
 7 files changed, 90 insertions(+), 70 deletions(-)

diff --git a/builder/check-tree.mjs b/builder/check-tree.mjs
index 39d1e3edd..3bbf757ba 100644
--- a/builder/check-tree.mjs
+++ b/builder/check-tree.mjs
@@ -18,8 +18,9 @@
 // site, and the offline tree has no reader for it yet.
 const ONLINE_AUX = ["sitemap.xml", "robots.txt", "assets/js/search-data.json", "tB/symbols.json"];
 // The offline tree carries neither sitemap nor search index, but does
-// get the JS wrapper writeOffline generates around the search data.
-const OFFLINE_AUX = ["assets/js/search-data.js"];
+// get the JS wrapper writeOffline generates around the search data, and
+// the nav.js that puts the whole nav tree in place of a page's part of it.
+const OFFLINE_AUX = ["assets/js/search-data.js", "assets/js/nav.js"];
 
 // Every relative path a tree receives. `which` is "online" or "offline";
 // the PDF tree's contents come from writePdf, which knows them exactly.
diff --git a/builder/cpu-worker.mjs b/builder/cpu-worker.mjs
index c71e12bad..00a1f1a73 100644
--- a/builder/cpu-worker.mjs
+++ b/builder/cpu-worker.mjs
@@ -11,7 +11,7 @@ import { regenerateDot } from "./dot.mjs";
 import { captureBuildInfo } from "./build-info.mjs";
 
 import { createMarkdownIt, renderPhase } from "./render.mjs";
-import { templatePhase } from "./template.mjs";
+import { renderFullNav, templatePhase, withPartialNav } from "./template.mjs";
 import { unpackShared } from "./sab-broadcast.mjs";
 import { deriveSearchEntries } from "./search.mjs";
 import { computeChunkSeo } from "./seo.mjs";
@@ -206,9 +206,12 @@ const handlers = {
         caches: { rawResolution: new Map(), seg: new Map(), result: new Map() },
       };
 
+      // An offline page holds only its part of the nav tree (withPartialNav).
+      env.fullNav ??= renderFullNav(env.site);
       const writable = chunk.filter((p) => p.html !== undefined);
       for (const p of writable) {
-        const { html, misses } = deriveOfflinePage(p, offlineState);
+        const offlinePage = { ...p, html: withPartialNav(p.html, p, env.site, env.fullNav) };
+        const { html, misses } = deriveOfflinePage(offlinePage, offlineState);
         p.offlineHtml = html;
         p.offlineMisses = misses;
       }
diff --git a/builder/offline.mjs b/builder/offline.mjs
index 734fd12cb..0744d6eea 100644
--- a/builder/offline.mjs
+++ b/builder/offline.mjs
@@ -210,8 +210,7 @@ async function copyOfflineStatics(staticFiles, deps) {
 }
 
 // §5.5  copyOfflineThemeAssets -- mirror _site/assets/, rewrite CSS,
-// skip the patched JTD JS (step [3] already wrote it) and nav.js
-// (writeOfflineNavJs writes the offline one).
+// skip the patched JTD JS (step [3] already wrote it).
 async function copyOfflineThemeAssets(deps) {
   const { destRoot, offlineRoot, counters, staticDestRels } = deps;
   const themeRoot = path.join(destRoot, "assets");
@@ -221,7 +220,6 @@ async function copyOfflineThemeAssets(deps) {
 
   await runLimited(themeEntries, LIMIT, async (e) => {
     if (e.isJtdJs) return;
-    if (e.isNavJs) return;
     if (e.isCombinedCss) return;
     const relAsset = "assets/" + e.relUnderAssets;
     // Already written by copyOfflineStatics -- see staticDestRels above.
@@ -582,7 +580,6 @@ async function collectThemeFiles(themeRoot) {
           isCss: childRel.endsWith(".css"),
           isCombinedCss: childRel === "css/just-the-docs-combined.css",
           isJtdJs: childRel === "js/just-the-docs.js",
-          isNavJs: `assets/${childRel}` === NAV_SCRIPT_REL,
         });
       }
     }
diff --git a/builder/tbdocs.mjs b/builder/tbdocs.mjs
index bf1d51740..8e16e9cd3 100644
--- a/builder/tbdocs.mjs
+++ b/builder/tbdocs.mjs
@@ -62,7 +62,7 @@ import { resolveBookChapters } from "./book.mjs";
 import { loadData } from "./data.mjs";
 import { createMarkdownIt, buildLinkTables, serializeLinkTables } from "./render.mjs";
 import { loadHighlightTheme } from "./highlight-theme.mjs";
-import { NAV_SCRIPT_REL, buildInitConfig, navScript, renderFullNav, renderSidebar } from "./template.mjs";
+import { NAV_SCRIPT_REL, buildInitConfig, renderSidebar } from "./template.mjs";
 import {
   writePhase,
   prepareDestinations,
@@ -626,9 +626,12 @@ const TASKS = {
         ...enumerateVendoredThemeAssets(),
         "assets/css/tb-highlight.css",
         "assets/css/just-the-docs-combined.css",
-        NAV_SCRIPT_REL,
       ];
-      const sitePaths = buildSitePathsSync(state.pages, state.staticFiles, excludePatterns, stubs, themeAssetRels);
+      // sitePaths is what the offline tree holds, and only it has nav.js.
+      const sitePaths = buildSitePathsSync(state.pages, state.staticFiles, excludePatterns, stubs, [
+        ...themeAssetRels,
+        NAV_SCRIPT_REL,
+      ]);
       state.sitePaths = sitePaths;
       const skipOffline = ctx.opts.skipOffline ?? state.site.config.also_build_offline === false;
 
@@ -698,6 +701,8 @@ const TASKS = {
           config: state.site.config,
           seoSiteTitle: state.site.seoSiteTitle,
           seoLogoUrl: state.site.seoLogoUrl,
+          // The offline pages' part of the nav tree is cut from it.
+          ...(skipOffline ? {} : { navTree: state.site.navTree }),
         },
         initData: { ...initData, sidebar },
         buildInfo,
@@ -852,12 +857,12 @@ const TASKS = {
     // copies that list. The chain prepPageDirs <- prepDest <- dispatch
     // <- markdownInit happens to order them today; naming the dependency
     // is what keeps that true.
-    expected: ["nav", "dot", "vendorAssets", "prepPageDirs", "highlighterInit"],
+    expected: ["dot", "vendorAssets", "prepPageDirs", "highlighterInit"],
     runOnMain: true,
     async execute({ dot: _dotSignal, highlighterInit: _highlightSignal }, ctx, state) {
       void _dotSignal; // dependency signal only; append already happened in dot.submit
       void _highlightSignal; // dependency signal only; highlightCss already written to state.site
-      const generatedAssets = [{ rel: NAV_SCRIPT_REL, content: navScript(renderFullNav(state.site)) }];
+      const generatedAssets = [];
       if (state.site.highlightCss) {
         generatedAssets.push({ rel: "assets/css/tb-highlight.css", content: state.site.highlightCss });
       }
diff --git a/builder/template.mjs b/builder/template.mjs
index 53d8bee31..29e732562 100644
--- a/builder/template.mjs
+++ b/builder/template.mjs
@@ -95,7 +95,7 @@ function templatePage(page, site, init) {
     `  <div id="a11y-status" class="sr-only" aria-live="polite" aria-atomic="true"></div>\n` +
     init.svgSprites +
     `\n` +
-    renderPageSidebar(init.sidebar, page) +
+    init.sidebar +
     `\n` +
     `  <div class="main" id="page-top">\n` +
     init.header +
@@ -360,50 +360,43 @@ function buildSvgSprites(config) {
 
 // ---------- §5.4 sidebar + recursive nav ---------------------------------
 
-export const NAV_SCRIPT_REL = "assets/js/nav.js";
-
-// The sidebar is the same on every page but for the nav tree, so it is
-// rendered once as the parts around the tree. A page holds only the part
-// of the tree that shows when it opens: the top level, and the children of
-// the page and of each of its ancestors (`renderPageSidebar`). The whole
-// tree is in the shared /assets/js/nav.js (`navScript`), loaded right after
-// the nav, which puts it in place before the page's scripts run. The
-// part keeps every sibling of the expanded path, so the nth-child
-// selectors of `navActivationCss` find the same items in both.
 function renderSidebar(site) {
   const config = site.config;
   const baseurl = String(config.baseurl ?? "");
-  return {
-    head:
-      `  <div class="side-bar">\n` +
-      `    <div class="site-header" role="banner">\n` +
-      `      <a href="${escapeMarkupAndQuotes(relativeUrl("/", baseurl))}" class="site-title lh-tight">${renderSiteTitle(config)}</a>\n` +
-      `      <button id="menu-button" class="site-button btn-reset" aria-label="Toggle menu" aria-expanded="false" aria-controls="site-nav">\n` +
-      `        <svg viewBox="0 0 24 24" class="icon" aria-hidden="true"><use xlink:href="#svg-menu"></use></svg>\n` +
-      `      </button>\n` +
-      `    </div>\n` +
-      `    <nav aria-label="Main" id="site-nav" class="site-nav">`,
-    tail:
-      renderNavExternalLinks(config) +
-      `</nav>\n` +
-      `    <script src="${escapeMarkupAndQuotes(relativeUrl(`/${NAV_SCRIPT_REL}`, baseurl))}"></script>\n` +
-      // Upstream sidebar.html: when nav_footer_custom.html is empty
-      // (it is on this site), the else-branch emits the "Just the Docs"
-      // fallback footer. The site doesn't override nav_footer_custom.html,
-      // so the upstream default applies verbatim.
-      `    <footer class="site-footer" aria-label="Site">\n` +
-      `      This site uses <a href="https://github.com/just-the-docs/just-the-docs">Just the Docs</a>, a documentation theme originally for Jekyll.\n` +
-      `    </footer>\n` +
-      `  </div>`,
-    tree: site.navTree,
-    baseurl,
-  };
+  return (
+    `  <div class="side-bar">\n` +
+    `    <div class="site-header" role="banner">\n` +
+    `      <a href="${escapeMarkupAndQuotes(relativeUrl("/", baseurl))}" class="site-title lh-tight">${renderSiteTitle(config)}</a>\n` +
+    `      <button id="menu-button" class="site-button btn-reset" aria-label="Toggle menu" aria-expanded="false" aria-controls="site-nav">\n` +
+    `        <svg viewBox="0 0 24 24" class="icon" aria-hidden="true"><use xlink:href="#svg-menu"></use></svg>\n` +
+    `      </button>\n` +
+    `    </div>\n` +
+    `    ${NAV_OPEN}` +
+    renderNavTree(site.navTree, [], baseurl) +
+    renderNavExternalLinks(config) +
+    `</nav>\n` +
+    // Upstream sidebar.html: when nav_footer_custom.html is empty
+    // (it is on this site), the else-branch emits the "Just the Docs"
+    // fallback footer. The site doesn't override nav_footer_custom.html,
+    // so the upstream default applies verbatim.
+    `    <footer class="site-footer" aria-label="Site">\n` +
+    `      This site uses <a href="https://github.com/just-the-docs/just-the-docs">Just the Docs</a>, a documentation theme originally for Jekyll.\n` +
+    `    </footer>\n` +
+    `  </div>`
+  );
 }
 
-function renderPageSidebar(sidebar, page) {
-  const open = page.navLevels ? page.navLevels.slice(1) : [];
-  return sidebar.head + renderNavTree(sidebar.tree, [], sidebar.baseurl, open) + sidebar.tail;
-}
+// The offline tree's nav. An online page holds the whole tree, so the nav
+// works without JavaScript. An offline page holds only the part of it that
+// shows when the page opens: the top level, and the children of the page and
+// of each of its ancestors. The whole tree is in the offline tree's
+// /assets/js/nav.js (`navScript`), loaded right after the nav, which puts it
+// in place before the page's scripts run. The part keeps every sibling of the
+// expanded path, so the nth-child selectors of `navActivationCss` find the
+// same items in both.
+
+export const NAV_SCRIPT_REL = "assets/js/nav.js";
+const NAV_OPEN = `<nav aria-label="Main" id="site-nav" class="site-nav">`;
 
 /** The whole nav tree's first list, compressed as a page is. */
 export function renderFullNav(site) {
@@ -411,8 +404,28 @@ export function renderFullNav(site) {
 }
 
 /**
- * /assets/js/nav.js: puts the whole tree in place of a page's part of it.
- * `navHtml` is `renderFullNav`'s list; in the offline tree its links are
+ * A templated page's HTML with its whole nav tree (`fullNav`, from
+ * `renderFullNav`) swapped for the page's part of it, and nav.js loaded
+ * after the nav: what the offline tree is derived from. A page without the
+ * whole tree is returned as it is.
+ */
+export function withPartialNav(html, page, site, fullNav) {
+  const navAt = html.indexOf(NAV_OPEN + fullNav);
+  if (navAt === -1) return html;
+  const treeAt = navAt + NAV_OPEN.length;
+  const closeAt = html.indexOf("</nav> ", treeAt + fullNav.length);
+  if (closeAt === -1) return html;
+  const baseurl = String(site.config.baseurl ?? "");
+  const open = page.navLevels ? page.navLevels.slice(1) : [];
+  const part = compressHtml(renderNavTree(site.navTree, [], baseurl, open).replace(/\n$/, ""));
+  const script = `<script src="${escapeMarkupAndQuotes(relativeUrl(`/${NAV_SCRIPT_REL}`, baseurl))}"></script> `;
+  const afterNav = closeAt + "</nav> ".length;
+  return html.slice(0, treeAt) + part + html.slice(treeAt + fullNav.length, afterNav) + script + html.slice(afterNav);
+}
+
+/**
+ * The offline tree's /assets/js/nav.js: puts the whole tree in place of a
+ * page's part of it. `navHtml` is `renderFullNav`'s list with its links
  * relative to the site's root, and the page's `OFFLINE_SITE_ROOT` goes in
  * front of each. The help add-in's pane hides the nav, so it is left alone
  * there.
diff --git a/docs/Documentation/Builder.md b/docs/Documentation/Builder.md
index 1237268c5..c42a1061f 100644
--- a/docs/Documentation/Builder.md
+++ b/docs/Documentation/Builder.md
@@ -64,7 +64,7 @@ Modules grouped by role. Each entry has one line; deep-dive in [Pipeline Stages]
 | [`worker-pool.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/worker-pool.mjs) | Worker lifecycle wrapper: spawn, send the SAB, forward messages to the scheduler, terminate. No dispatch logic. |
 | [`cpu-worker.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/cpu-worker.mjs) | Worker harness. Runs the pull loop, holds the eight named handlers, handles speculative idle execution. |
 | [`sab-scheduler.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/sab-scheduler.mjs) | SAB layout, allocation, task-metadata API. Constants and atomics primitives consumed by both the scheduler and the workers. |
-| [`sab-broadcast.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/sab-broadcast.mjs) | JSON-over-SAB pack/unpack for the shared payload (config, link tables, the sidebar and its nav tree, etc.) broadcast to every render worker. |
+| [`sab-broadcast.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/sab-broadcast.mjs) | JSON-over-SAB pack/unpack for the shared payload (config, link tables, sidebar HTML, the nav tree when the offline tree is built, etc.) broadcast to every render worker. |
 
 **Discovery and compute**
 
@@ -96,7 +96,7 @@ Modules grouped by role. Each entry has one line; deep-dive in [Pipeline Stages]
 | [`render.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/render.mjs) | markdown-it configuration + plugin stack + `renderPhase`. Built once on main and once per worker. The plugins worth knowing by name: `svgInlinePlugin` (build-time SVG embedding), `videoLinkPlugin` (a `{: .video }` link becomes a locally vendored poster frame), `remoteImagePlugin` (a user-attachment URL becomes the vendored copy, in both markdown and raw `<img>` syntax), and `headingLevelNormalizePlugin` (renumbers a page that uses h1 and h3 but no h2, so the built page has no heading skip). |
 | [`highlight.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/highlight.mjs) | Shiki bootstrap + the bundled twinBASIC grammar. Emits the just-the-docs wrapper structure. |
 | [`highlight-theme.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/highlight-theme.mjs) | Loads `Light.theme` + `Dark.theme`, emits `tb-highlight.css` + scope-to-class lookup. Clamps any token colour that falls below 4.5:1 against the code-block background --- moving lightness away from the background while preserving hue and saturation --- so highlighted code meets WCAG AA; the emitted rule includes a `raised to 4.5:1` comment naming the original colour. |
-| [`template.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/template.mjs) | `templatePhase` (per-page layout wrap) + `buildInitConfig` + `renderSidebar`, whose nav holds only the part of the tree a page opens with, + `navScript`, the text of `assets/js/nav.js`, which holds the whole tree. JS template literals; no template engine. Also `injectAnchorHeadings(html, headingsOut)`, which adds the permalink icon to each heading and collects the heading list as it goes, and `renderSectionLinks`, which spends that list on the per-page disclosure at the top of the footer. |
+| [`template.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/template.mjs) | `templatePhase` (per-page layout wrap) + `buildInitConfig` + `renderSidebar` + `withPartialNav`, which cuts an offline page's nav down to the part of the tree the page opens with, + `navScript`, the text of the offline tree's `assets/js/nav.js`, which holds the whole tree. JS template literals; no template engine. Also `injectAnchorHeadings(html, headingsOut)`, which adds the permalink icon to each heading and collects the heading list as it goes, and `renderSectionLinks`, which spends that list on the per-page disclosure at the top of the footer. |
 | [`strftime.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/strftime.mjs) | `formatDate`, the strftime formatter for the footer's "Page last modified" line, written only for a page that sets `last_modified_date`. |
 | [`compress.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/compress.mjs) | Whitespace compression outside `<pre>` blocks. |
 
@@ -250,7 +250,7 @@ config ┬→ highlighterInit → loadData
 
 - `discover` --- traverses `docs/`, classifies pages vs static files, builds `state.pageByDest`.
 - `vendorAssets` --- finds the YouTube video markers and GitHub user-attachment URLs in the pages, downloads any file not already in `docs/assets/thumbnails/` or `docs/assets/attachments/`, and adds the new files to the static-file copy. `markdownInit` and `writeAssets` both depend on it.
-- `nav` --- builds the sidebar tree, runs the integrity check (orphan / ambiguous `parent:` aborts the build here), pre-renders the sidebar around its nav tree. Each page renders its own part of the tree; `writeAssets` writes the whole tree to `assets/js/nav.js`.
+- `nav` --- builds the sidebar tree, runs the integrity check (orphan / ambiguous `parent:` aborts the build here), pre-renders the sidebar HTML.
 - `dot` (worker) --- regenerates stale `.dot` → `.svg` via the WASM build of Graphviz. WASM init (~50 ms) hides behind the main spine; per-diagram render is synchronous after that.
 - `buildInit` --- pre-renders the config-only chrome (SVG sprites, header, search footer, favicon). No nav-tree dependency; runs in parallel with `nav`.
 - `markdownInit` --- builds the link tables, instantiates the shared markdown-it, computes site-level SEO. The serialized link tables and site-level SEO constants travel to render workers as part of the shared SAB payload.
@@ -279,7 +279,7 @@ dispatch ┬→ render:0 ┬→ flush:0 ┐
 - `prepPageDirs` (main) --- pre-creates every page output directory. Lets `flush:i` skip `mkdir` entirely.
 - `warmInit` (worker, `on_demand` + `unique_per_worker` + `run_when_idle` + `survives_reset`) --- per-lane Shiki bootstrap. The flag combination means workers run it during the main-thread spine if they have no other claimable work, every render-worker needs it on its own lane, and in serve mode the per-lane done flag survives across rebuilds so the second build skips warmup entirely.
 - `renderEnvInit` (worker, `on_demand` + `unique_per_worker`) --- per-lane render environment setup: unpack the shared SAB, reconstruct the link-table Maps, instantiate the worker's own markdown-it. Declared as a `perWorkerDeps` on every `render:i` so the first render claim per lane pulls it in.
-- `render:i` (worker, dynamic) --- the per-chunk compute. Each one runs five sub-stages over its slice of `state.pages`: `renderPhase` (markdown-it body render) → `computeChunkSeo` (per-page SEO fields) → `templatePhase` (just-the-docs layout wrap) → `deriveOfflinePage` (offline HTML rewrite) → `deriveSearchEntries` (per-section search entries). Returns a delta containing `renderedContent` per page, plus the per-chunk search entries.
+- `render:i` (worker, dynamic) --- the per-chunk compute. Each one runs five sub-stages over its slice of `state.pages`: `renderPhase` (markdown-it body render) → `computeChunkSeo` (per-page SEO fields) → `templatePhase` (just-the-docs layout wrap) → `withPartialNav` + `deriveOfflinePage` (offline nav cut and HTML rewrite) → `deriveSearchEntries` (per-section search entries). Returns a delta containing `renderedContent` per page, plus the per-chunk search entries.
 - `renderJoin` (main, `on_demand`) --- barrier that unblocks `searchData`, `symbolIndex` and `writePdf`. `dispatch.submit()` sets its dep count to N *and* rewrites its `expected` list with every chunk name; the dep count alone is not a barrier over the submits. See [Pipeline Stages](Pipeline-Stages#renderjoin-main-on_demand).
 
 ### Write
@@ -354,7 +354,7 @@ Worker output flow: a worker posts `{ done: taskIdx, output, timing, lane }` to
 `dispatch.execute()` runs on the main thread and assembles two SAB payloads:
 
 - **Per-task payload SAB** --- one JSON blob per `render:i`, each containing the chunk's `Page` objects. `chunkOffset[i]` / `chunkLength[i]` index into the buffer.
-- **Shared payload SAB** --- one JSON blob broadcast to every worker, containing the site config, site-level SEO constants, the pre-rendered sidebar, its nav tree and the chrome (`initData`), serialized link tables (`[key, permalink]` pair arrays), the static-file relative-path set, the baseurl, the site-paths set for offline rewriting, the `offline_exclude` patterns, and the `skipOffline` flag.
+- **Shared payload SAB** --- one JSON blob broadcast to every worker, containing the site config, site-level SEO constants, the pre-rendered sidebar + chrome (`initData`), the nav tree when the offline tree is built, serialized link tables (`[key, permalink]` pair arrays), the static-file relative-path set, the baseurl, the site-paths set for offline rewriting, the `offline_exclude` patterns, and the `skipOffline` flag.
 
 `dispatch.submit()` allocates 2N dynamic slots from the generic pool in `sab-scheduler.mjs`, writes their handler IDs and per-worker dep lists, wires the successor edges, pins each `flush:i` to its `render:i`, calls `broadcastDynamicData(payloadSAB, sharedSAB)` (one `postMessage` per worker carrying the two SAB references --- shared memory, not cloned), and finally flips the `render:i` slots to `READY`. Workers see the new tasks on their next scan.
 
@@ -365,9 +365,11 @@ Each `render:i` runs five sub-stages over its chunk:
 1. `renderPhase(chunk, env.site)` --- the markdown-it body render.
 2. `computeChunkSeo(chunk, env.site.seoSiteTitle, env.site.config, env.site.markdown)` --- per-page SEO fields.
 3. `templatePhase(chunk, env.site, env.initData)` --- just-the-docs layout wrap. `env.initData` is the pre-rendered chrome from `dispatch`.
-4. Offline rewrite (when `!skipOffline`) --- each page through `deriveOfflinePage`.
+4. Offline rewrite (when `!skipOffline`) --- each page's nav cut to its part of the tree (`withPartialNav`), then the page through `deriveOfflinePage`.
 5. `deriveSearchEntries(chunk, env.site)` --- per-section search-index entries.
 
+In the offline tree the sidebar's whole nav tree is in `assets/js/nav.js`, which `writeOffline` writes. An offline page holds only the part of the tree that shows when it opens: the top level, and the children of the page and of each of its ancestors. Without that, the tree would be most of every page's bytes. `nav.js` is loaded right after the nav and puts the whole tree in place before the theme's script marks the current page; without scripting, the page still shows its part. The tree's links are relative to the site's root, and the script puts the page's path to the root in front of each. In the help add-in's pane, which hides the sidebar, it does nothing. Online pages hold the whole nav tree and have no `nav.js`, so the site's navigation works without scripting.
+
 The worker stores the writable pages on its own `_pendingFlush` FIFO and returns the deltas. The matching `flush:i` --- pinned to this lane --- claims later, pops the batch, and writes the page HTML to disk. The pinning is what guarantees the batch lands on the right worker; the FIFO is what handles the case where a worker has already started a second `render:i` before its first `flush:i` claims.
 
 ## Persistent worker pool and serve mode
@@ -492,7 +494,7 @@ The site's `/assets/` tree at deploy time is assembled from three sources:
 |---|---|---|
 | `docs/assets/` | Project-owned content: the two SCSS entry points, project JS (`theme-toggle.js`, `svg-inline.js`), hand-written stylesheets (`print.css`, `just-the-docs-head-nav.css`), Graphviz/DOT diagrams (`.dot` sources + `.svg` renders), the self-hosted webfaces under `fonts/` (subset `.woff2` plus their OFL licences), and any content images contributors add. | Discovered by [`discover.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/discover.mjs), copied by `writeAssets`. |
 | `builder/vendor/just-the-docs/` | Vendored from the just-the-docs theme (v0.10.1), and patched in tree rather than held pristine: `_sass/` (the theme's SCSS sources, fed into the compilation --- 30 of its files differ from the v0.10.1 originals) and `assets/js/just-the-docs.js` (also patched) + `assets/js/vendor/lunr.min.js` (unmodified); both JS files are copied verbatim into the output. See [`builder/vendor/just-the-docs/README.md`](https://github.com/twinbasic/documentation/blob/main/builder/vendor/just-the-docs/README.md) for the file-by-file inventory, the re-vendoring procedure, and the in-tree patches --- which cover `_sass/` as well as `just-the-docs.js`. | `_sass/` consumed by [`scss.mjs`](https://github.com/twinbasic/documentation/blob/main/builder/scss.mjs); `assets/` copied by `writeAssets`. |
-| Generated in-process | `just-the-docs-combined.css` (from `scss.mjs`, over the two entry points plus every partial under `docs/_sass/` --- see [Project styling](#project-styling)) and `tb-highlight.css` (from `highlight-theme.mjs`), and `assets/js/nav.js` (from `template.mjs`'s `navScript`). None is committed; all are rebuilt every run. | Written by `scss` (combined CSS) and `writeAssets` (highlight CSS, `nav.js`). |
+| Generated in-process | `just-the-docs-combined.css` (from `scss.mjs`, over the two entry points plus every partial under `docs/_sass/` --- see [Project styling](#project-styling)) and `tb-highlight.css` (from `highlight-theme.mjs`). Neither is committed; both are rebuilt every run. | Written by `scss` (combined CSS) and `writeAssets` (highlight CSS). |
 
 The fonts are committed artifacts, like the DOT renders: `scripts/build_fonts.py` regenerates them from pinned upstream releases, and the build neither downloads nor subsets anything. The stylesheets reference them with a *relative* `url("../fonts/...")` rather than a root-absolute path, so the same compiled CSS resolves in the online tree, the `file://` offline mirror, a `--baseurl` deployment and the sparse PDF tree without any rewrite. `builder/pdf.mjs` copies the six faces `print.css` declares into `_site-pdf/` explicitly, since that tree is sparse and carries only what the book render needs.
 
@@ -500,8 +502,6 @@ CSS files in either copy path get a baseurl rewrite (`url("/path")` → `url("<b
 
 The project JS is deliberately small. `theme-toggle.js` implements the three-state (system / light / dark) theme switch as a progressive enhancement over the no-JS `prefers-color-scheme` default: the correct palette renders even with scripting disabled, and the script only adds the manual override that persists a `data-theme` choice. A page opened with `?theme=light` or `?theme=dark` takes that theme instead, as do the pages reached from it in the same tab, without changing the reader's stored choice; the IDE's help add-in passes the IDE's theme this way. It also passes `?pane=1`, which the same early script keeps for the tab and which hides the sidebar and the header, so that its narrow pane shows the page alone. `svg-inline.js` powers the click-to-zoom overlay and the download / copy controls on inlined diagrams.
 
-The sidebar's whole nav tree is in `nav.js`, which the build writes. A page holds only the part of the tree that shows when it opens: the top level, and the children of the page and of each of its ancestors. Without that, the tree would be most of every page's bytes. `nav.js` is loaded right after the nav and puts the whole tree in its place before the theme's script marks the current page, so the sidebar works as before; without scripting it still shows that part. In the offline tree its links are relative to the site's root, and the script puts the page's path to the root in front of each. In the help add-in's pane, which hides the sidebar, it does nothing.
-
 ## Project styling
 
 **Every hand-written style rule the project owns lives under `docs/_sass/`.** A CSS rule for a new component goes there --- not into the vendored theme sources under `builder/vendor/just-the-docs/_sass/`, and not into a new stylesheet of its own. Everything under `docs/_sass/` compiles into one asset, `assets/css/just-the-docs-combined.css`, which is the stylesheet every page loads.
diff --git a/docs/Documentation/Pipeline-Stages.md b/docs/Documentation/Pipeline-Stages.md
index 052890f86..8b663404e 100644
--- a/docs/Documentation/Pipeline-Stages.md
+++ b/docs/Documentation/Pipeline-Stages.md
@@ -37,7 +37,7 @@ The pipeline passes three pieces of mutable state through every task: the `pages
 | `layoutDefault` | `discover` | `boolean` | `true` when frontmatter has no explicit `layout:` key. |
 | `imageScope` | `discover` | `boolean` | `true` when `srcRel` contains an `Images/` segment. Phase 3 uses this to validate image paths. |
 | `navPath` | `nav` | `string` | Slash-joined nav chain: `grand_parent / parent / title`. Set only on pages with a non-empty title. |
-| `navLevels` | `nav` | `object` | Positional indices in the sidebar tree. `templatePhase` uses this to generate per-page activation CSS and to choose the part of the nav tree the page holds. |
+| `navLevels` | `nav` | `object` | Positional indices in the sidebar tree. `templatePhase` uses this to generate per-page activation CSS, and `withPartialNav` to choose the part of the nav tree an offline page holds. |
 | `breadcrumbs` | `nav` | `Page[]` | Ancestor chain from the root to the current page, nearest-first. |
 | `children` | `nav` | `Page[]` | Immediate child pages in nav order. |
 | `renderedContent` | `render:i` | `string` | HTML body produced by markdown-it. Set on the worker, merged back into the master page via the render delta. |
@@ -206,7 +206,7 @@ nav.expected = ["discover"]
 nav.execute() → { sidebar }
 ```
 
-Calls `computeNav(state.pages, state.site.config)` from `nav.mjs`, then `renderSidebar(state.site)` from `template.mjs`. The nav-integrity check runs inside `computeNav` and throws on orphan or ambiguous `parent:` declarations. Returns the sidebar as the HTML around the nav tree and the tree itself, for `dispatch` to fold into the shared payload; each page renders its own part of the tree.
+Calls `computeNav(state.pages, state.site.config)` from `nav.mjs`, then `renderSidebar(state.site)` from `template.mjs`. The nav-integrity check runs inside `computeNav` and throws on orphan or ambiguous `parent:` declarations. Returns the pre-rendered sidebar HTML for `dispatch` to fold into the shared payload.
 
 ### `dot` (worker)
 
@@ -326,7 +326,7 @@ Handler (`render` in `cpu-worker.mjs`):
 2. `await renderPhase(chunk, env.site)` --- markdown-it body render.
 3. `computeChunkSeo(chunk, env.site.seoSiteTitle, env.site.config, env.site.markdown)` --- per-page SEO fields.
 4. `await templatePhase(chunk, env.site, env.initData)` --- just-the-docs layout wrap.
-5. When `env.offlineBase` is set: call `deriveOfflinePage` for each writable page.
+5. When `env.offlineBase` is set: for each writable page, call `withPartialNav` to cut the page's nav down to its part of the tree, then `deriveOfflinePage`.
 6. Store `{ destPath, html, offlineHtml, offlineMisses }` on the worker's `_pendingFlush` FIFO so the matching `flush:i` can drain it.
 7. `deriveSearchEntries(chunk, env.site)` --- per-section search entries, with any [index entries](Authoring#index-entries-for-the-site-search) the page's frontmatter or headings name. Trim `sourcePage` and the chunk-local `i` before returning (main reassigns global indices).
 
@@ -405,7 +405,7 @@ Aggregates per-chunk write stats. Unblocks `writeAux`, `writePdf` and `linkJoin`
 writeAssets.expected = ["dot", "vendorAssets", "prepPageDirs", "highlighterInit"]
 ```
 
-Calls `writePhase(state.pages, state.staticFiles, { destRoot, dryRun, generatedAssets, baseurl, skipPages: true })` from `write.mjs`. Copies vendored theme JS, copies project static files, writes generated assets (`tb-highlight.css` from `state.site.highlightCss`, and `assets/js/nav.js`, the whole nav tree). **Does not** write page HTML --- the per-chunk `flush:i` tasks already did that. The CSS baseurl rewrite (`url("/path")` → `url("<baseurl>/path")`) applies to both copy paths and to generated assets.
+Calls `writePhase(state.pages, state.staticFiles, { destRoot, dryRun, generatedAssets, baseurl, skipPages: true })` from `write.mjs`. Copies vendored theme JS, copies project static files, writes generated CSS (`tb-highlight.css` from `state.site.highlightCss`). **Does not** write page HTML --- the per-chunk `flush:i` tasks already did that. The CSS baseurl rewrite (`url("/path")` → `url("<baseurl>/path")`) applies to both copy paths and to generated assets.
 
 ### `searchData` (main)
 
@@ -771,9 +771,10 @@ For **renderer rules**, order inverts. Both image plugins capture the current `m
 | `templatePhase` | `(pages, site, initData) → Promise<void>` | Wraps each page's `renderedContent` in the just-the-docs layout, runs `compressHtml`, stores the result in `page.html`. Skips `layout: book-combined`. |
 | `buildInitConfig` | `(site) → object` | Pre-renders the config-only chrome (SVG sprites, header, search footer, favicon, GA). Called by the `buildInit` task. |
 | `buildInitFn` | (alias of internal `buildInit`) | Available for harnesses; combines `buildInitConfig` + `renderSidebar` in one call. |
-| `renderSidebar` | `(site) → { head, tail, tree, baseurl }` | Pre-renders the sidebar around its nav tree. Called by the `nav` task; the output is folded into the shared payload by `dispatch`, and `templatePhase` renders each page's part of the tree between `head` and `tail`. |
+| `renderSidebar` | `(site) → string` | Pre-renders the sidebar HTML. Called by the `nav` task; the output is folded into the shared payload by `dispatch`. |
 | `renderFullNav` | `(site) → string` | The whole nav tree's list, compressed as a page is. |
-| `navScript` | `(navHtml) → string` | The text of `assets/js/nav.js`, which puts the whole tree in place of a page's part of it. |
+| `withPartialNav` | `(html, page, site, fullNav) → string` | An offline page's HTML before its rewrite: the whole nav tree swapped for the page's part of it, and `nav.js` loaded after the nav. |
+| `navScript` | `(navHtml) → string` | The text of the offline tree's `assets/js/nav.js`, which puts the whole tree in place of a page's part of it. |
 | `navActivationCss` | `(page) → string` | Per-page `<style id="jtd-nav-activation">` block. |
 | `injectAnchorHeadings` | `(html, headingsOut) → string` | Adds `<a class="anchor-heading">` next to every heading with an `id` outside `<code>` and `<pre>`, and pushes each heading onto `headingsOut` as it goes. The icon is deliberately `aria-hidden="true" tabindex="-1"`; the keyboard and screen-reader equivalent is the per-page `<details class="section-links">` block that `renderFooter` builds from `headingsOut`. |
 

From 292eb54b0f9d67d65456314f4e82a6edf7784b1e Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 11:48:58 +0200
Subject: [PATCH 04/42] WIP.Harness.md: a program that starts a compiler can
 connect to it; the page's work over the connections, not the connection
 itself, is why the harness drives the IDE

---
 WIP.Harness.md | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/WIP.Harness.md b/WIP.Harness.md
index 4a73bfa1b..c0ca6ccdd 100644
--- a/WIP.Harness.md
+++ b/WIP.Harness.md
@@ -434,8 +434,8 @@ other thirty their run.
 
 ### Why it drives the WebView rather than the compiler directly
 
-The obvious improvement is to cut the browser out --- the compiler has websockets, so why go
-through a UI at all? **It cannot be done, and the reason is structural.**
+The obvious improvement is to cut the browser out: the compiler has websockets, so why go
+through a UI at all? **It can be done, and the harness does not do it yet.**
 
 The IDE is three processes, and their command lines say how they relate:
 
@@ -443,18 +443,20 @@ The IDE is three processes, and their command lines say how they relate:
 |---|---|---|
 | `twinBASIC.exe` | `<project.twinproj>` | shell; hosts the WebView2, and the only one given the project |
 | `twinBASIC_win32.exe` | `--ide=<shell pid>` | serves `ide/` over HTTP on an ephemeral port |
-| `twinBASIC_win32_noDEP.exe` | `--compiler=<opaque token>` | the compiler; the page talks to it over websockets |
+| `twinBASIC_win32_noDEP.exe` | `--compiler=<window handle>` | the compiler; the page talks to it over websockets |
 
 The page's websockets carry everything the window shows about a compile, the diagnostics and
 their counts included.
 
-**But what a connection needs, its address and its key, is minted inside the WebView**, by
-host objects the shell gives its page --- reachable only from a page the shell has loaded.
-Starting the compiler directly is no way round it either: `--compiler=` is not a port but
-an opaque handle the shell hands it. So a proxy between the WebView and the HTTP server is
-possible --- the page and its scripts come over plain HTTP, and a patched `main2.js` could
-be served --- but it would not remove the WebView, it would only change what runs inside it.
-The thing you would want to delete is the thing that mints the connection.
+**The compiler chooses its own address and key, and tells the process that started it.** So
+a program that starts a compiler itself can connect to it, and `--compiler=` need not name a
+real window for a compile or a build (BETA 995).
+
+What stands in the way is the work the page does over those connections. It loads the
+project, gives the compiler every package the project needs, answers what the compiler asks,
+and works out when a compile has finished. A client without the WebView has to do all of
+that itself, in a protocol that is the IDE's own and may change with any beta, while the IDE
+always speaks its own build's. So the harness drives the IDE.
 
 Watching the page's traffic is another matter: CDP shows it to the harness with no key, and
 the wait for a compile ends on it (*How the wait for the compile ends*, above). The

From 6ca5717e6bdf4a1fb290d9f0a95c8e2b26ebfbb8 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 16:31:42 +0200
Subject: [PATCH 05/42] WIP.md: the pointer to WIP.Harness.md says why the
 harness drives the IDE rather than the compiler's own websockets, no longer
 that they cannot be driven

---
 WIP.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/WIP.md b/WIP.md
index 4c258e90a..f783c8e44 100644
--- a/WIP.md
+++ b/WIP.md
@@ -127,9 +127,9 @@ node scripts/tbrun.mjs <exported-source-dir>         # what does it print
 - **The sweep is the probe for a whole attribute.** Before writing or changing an attribute's `Applicable to:` line, run `sweep_attributes.mjs --names <Name>` (a minute or a few; the once-per-project ones, `RunAfterBuild` and `RunBeforeStartupObject`, take several); it tries every declaration site, not only the ones already claimed. **Always pass `--out` and `--dump-results`**: a run piped through `tail` keeps one line of a report that takes ten minutes. A clean build there means the compiler accepts the attribute, not that it does anything, and an Enum member cannot be tested at all (see [WIP.Harness.md](WIP.Harness.md#sweeping-every-attribute-at-every-site)).
 - **End an IDE by its pid, never by image name.** `taskkill /IM twinBASIC.exe` ends every other run's IDE, another session's included, and the user's own. `tbbuild --keep` prints the pid for this reason.
 
-Why each of those is true, what the WebView/CDP route costs, why the compiler's
-own websockets cannot be driven instead, and the seven ways a sweep of this
-corpus returns a wrong answer: [WIP.Harness.md](WIP.Harness.md).
+Why each of those is true, what the WebView/CDP route costs, why the harness
+drives the IDE rather than the compiler's own websockets, and the seven ways a
+sweep of this corpus returns a wrong answer: [WIP.Harness.md](WIP.Harness.md).
 
 **Testing an IDE add-in** is `addin-test.bat`, run by a person as `examples.bat` is. Each
 lane in `test/addin/lanes.mjs` builds the add-ins it tests into a private copy of the

From a4f4163491c39267dce458173c1c5b856076a791 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 16:57:45 +0200
Subject: [PATCH 06/42] Help add-in serves the documentation offline:
 HelpServer, a Winsock server on the add-in's thread, sends the pages from an
 embedded zip of the offline tree that build_help_archive.mjs writes;
 help-offline lane

---
 .gitignore                     |   4 +
 WIP.HelpAddin.md               |  49 +++-
 WIP.md                         |   3 +-
 add-in/Settings                |   2 +-
 add-in/Sources/HelpAddIn.twin  |  32 ++-
 add-in/Sources/HelpServer.twin | 464 +++++++++++++++++++++++++++++++++
 docs/Documentation/Tools.md    |  22 +-
 scripts/build_help_archive.mjs | 359 +++++++++++++++++++++++++
 scripts/lib/cli-cases.mjs      |   3 +
 test/addin/help.test.mjs       | 137 +++++++---
 test/addin/lanes.mjs           |   4 +-
 11 files changed, 1032 insertions(+), 47 deletions(-)
 create mode 100644 add-in/Sources/HelpServer.twin
 create mode 100644 scripts/build_help_archive.mjs

diff --git a/.gitignore b/.gitignore
index 62cb1f9b0..0ce436d08 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,6 +28,10 @@ indexer/.packages/
 # docs/assets/fonts/ -- only the archives are throwaway.
 /.font-cache/
 
+# The help add-in's documentation archive is built by scripts/build_help_archive.mjs
+# from docs/_site-offline, and is too large to commit.
+/add-in/Resources/HELP/
+
 # A bug reproducer's zip is only for attaching to its GitHub issue (see
 # BUGS-TO-REPORT.md); the .twinproj beside it is committed.
 /bugs/**/*.zip
diff --git a/WIP.HelpAddin.md b/WIP.HelpAddin.md
index 81fac93fe..d172f2058 100644
--- a/WIP.HelpAddin.md
+++ b/WIP.HelpAddin.md
@@ -359,7 +359,8 @@ with files put in a lane's copy of the install:
   own pages, then, and `sandbox` on the frame if that matters.
 
 So the offline site would work copied into `ide\`, with one cost the live site does not
-have: writing into the install, which every new build replaces. Still deferred.
+have: writing into the install, which every new build replaces. The add-in serves the
+offline site itself instead (Stage 4, increment 5), so this route is not taken.
 
 ### What is under the cursor
 
@@ -784,9 +785,9 @@ has the complete list):
 - **The rest of an embedded mode for pages.** The theme is done: the site reads a
   `theme=dark|light` query parameter (Stage 4, increment 2), since the add-in cannot reach
   into a cross-site frame. Hiding the header and navigation is a separate, optional
-  question, untested. The parameter serves the live site only: the IDE's own server answers
-  any URL with a query string with a 404 (P13), so the offline route would need the theme
-  some other way.
+  question, untested. The IDE's own server answers any URL with a query string with a 404
+  (P13); the add-in's server (increment 5) ignores the query, so the parameter works
+  offline too.
 - **Keywords with no page of their own** --- `ElseIf`, `Until`, `Step`, `To`, `In`,
   `ByVal`, `ByRef`, `Optional`, `As` --- are in the index only where a page's title gives
   them. Adding one is a `symbols:` line on the page that explains it, which is a content
@@ -795,7 +796,8 @@ has the complete list):
   `/Reference/Data-Types`, outside `/tB/`, so the index cannot carry them without breaking
   its own rule. Giving that page a `/tB/` permalink, with the old one in `redirect_from:`,
   would. Deferred.
-- **The offline tree has no copy of the index**, since the offline route is deferred.
+- **The offline tree has no copy of the index.** The add-in embeds its own, and the help
+  archive (increment 5) is the offline tree as built.
 
 ### Stage 4: the add-in, in increments
 
@@ -950,9 +952,42 @@ harness about a second against opening a new IDE.
      right.
    - **The fault run** (`ShowPage` not putting the frame back) failed the four cases that
      show a page after a summary.
-5. **Later:** hover help through `CodeEditor.AddMonacoWidget` after a pause (the cost of
+5. **Offline help. Built**, tested by the lane `help-offline` on BETA 995, at the owner's
+   choice (2026-10-05): the add-in's own server, written in twinBASIC, serving one archive
+   embedded in the DLL. The owner's other choices: the archive is a resource; a separate
+   script makes it; the pane uses it when the DLL has it, and the live site otherwise; the
+   symbol index stays a resource of its own.
+   - **The archive** is `add-in/Resources/HELP/site.zip`, gitignored, written from
+     `docs/_site-offline` by `scripts/build_help_archive.mjs` (about 21 MB, 1,466 files;
+     the DLL builds with it for win32 and win64). An add-in built without it serves nothing
+     and uses the live site, as before. The offline tree is the one served: its links are
+     relative, so they work on any origin, and its pages hold only their part of the nav
+     tree.
+   - **No inflating in twinBASIC.** A deflated entry is sent as it is, between a 10-byte
+     gzip header and the CRC32 and size from the central directory, with
+     `Content-Encoding: gzip`; an image or font is stored and sent plain. So the format is
+     fixed by the script: no zip64, no data descriptors.
+   - **`HelpServer`** listens on 127.0.0.1 at a port Windows picks, on the add-in's own
+     thread: Winsock posts each socket's events to a message-only window
+     (`WSAAsyncSelect`), so there is no second thread. It reads the archive with
+     `LoadResDataInternal` once, at project load. A path is found as GitHub Pages finds it
+     (`/a/b` is `a/b.html`, or a 301 to `/a/b/` for a folder, keeping the query), the query
+     is ignored, and every reply closes its connection. It prints `serving site.zip, <n>
+     files, at <origin>`, which the lane reads, since the port changes with every compiler
+     restart.
+   - **The origin is `http://localhost:<port>`, not 127.0.0.1.** The IDE's page is on
+     localhost, so a frame on another localhost port is same-site and in its frame tree; a
+     frame on 127.0.0.1 is not there at all, and every case that reads the page failed.
+   - *Open in browser* still opens the live site.
+   - **The lane.** `help.test.mjs` runs twice: `help` builds a copy of `add-in/` without
+     `Resources/HELP`, whatever the working tree holds, and `help-offline` builds it with an
+     archive made by the script. A page's status is read from the page itself
+     (`PerformanceNavigationTiming.responseStatus`), so a 404 fails a case either way. An
+     offline-only case asks the server from Node: a page's gzip body and a stored image
+     byte for byte, a folder's 301, a 404 and `HEAD`.
+6. **Later:** hover help through `CodeEditor.AddMonacoWidget` after a pause (the cost of
    adding and removing widgets is not measured); offering only the packages the project
-   references; offline use.
+   references; how a user gets an add-in with the archive.
 
 **Lookup:**
 
diff --git a/WIP.md b/WIP.md
index f783c8e44..1cbeb3741 100644
--- a/WIP.md
+++ b/WIP.md
@@ -458,9 +458,10 @@ Why the report separates the wedged task from the merely blocked ones, and why
 - `book.bat` — renders the PDF from `docs\_site-pdf\book.html` via `node book\render-book.mjs` into `docs\_pdf\twinBASIC Book.pdf`. Run `build.bat` first to populate `_site-pdf/`; `book.bat` refuses a tree older than its sources rather than rendering the previous book (see [The book refuses a stale source tree](WIP.Build.md#the-book-refuses-a-stale-source-tree)).
 
 - `examples.bat` — compiles the documentation's own twinBASIC code samples, every `tb` fence marked `check_build`, and reports the ones the compiler refuses against the line in the page they came from; a statement sample also marked `check_run` is built and run, and what it prints is checked against the page. Needs a twinBASIC install and Windows, so it is outside every gate and outside CI; ~110 s over the 1,197 samples marked (33 of them `check_run`). `--build` also builds each project that compiles clean, and `--llvm` builds it with LLVM (see [WIP.ExamplesBuild.md](WIP.ExamplesBuild.md)). Two modes need no compiler at all: `--census` classifies every fence and says how many classifiable ones are still unmarked, and `--report <survey.json>` groups a saved `--propose --json` survey by diagnostic, section and unresolved name. `--propose` itself does compile. See [Compiling the reference's own code samples](#compiling-the-references-own-code-samples) and [WIP.ExamplesBuild.md](WIP.ExamplesBuild.md).
-- `addin-test.bat` — tests IDE add-ins by operating an IDE: every lane in `test/addin/lanes.mjs` builds the add-ins it tests into a private copy of the install, opens a project and checks what the add-in does. Outside every gate and outside CI for the same reasons as `examples.bat`; about two minutes for the twelve lanes today (BETA 995): Samples 10 and 15, the nine probe lanes behind Stage 2's answers in [WIP.HelpAddin.md](WIP.HelpAddin.md), and the help add-in in `add-in/`, built with its committed copy of the symbol index, `add-in/Resources/SYMBOLS/symbols.json`, which a local build rewrites whenever the index changes. The help lane serves the built `docs/_site` on localhost to the add-in's pane, so run `build.bat` first. Exit 0 every lane passed and the registry is as it was found, 1 a lane failed, 2 the harness failed, 3 the registry or a work folder was not put back. See [Driving the twinBASIC compiler](#driving-the-twinbasic-compiler) for its rules.
+- `addin-test.bat` — tests IDE add-ins by operating an IDE: every lane in `test/addin/lanes.mjs` builds the add-ins it tests into a private copy of the install, opens a project and checks what the add-in does. Outside every gate and outside CI for the same reasons as `examples.bat`; about two minutes for the thirteen lanes today (BETA 995): Samples 10 and 15, the nine probe lanes behind Stage 2's answers in [WIP.HelpAddin.md](WIP.HelpAddin.md), and the help add-in in `add-in/` twice, built with its committed copy of the symbol index, `add-in/Resources/SYMBOLS/symbols.json`, which a local build rewrites whenever the index changes. The `help` lane serves the built `docs/_site` on localhost to the add-in's pane; `help-offline` builds the add-in with a help archive of `docs/_site-offline` and the pane's pages come from the add-in's own server. So run `build.bat` first. Exit 0 every lane passed and the registry is as it was found, 1 a lane failed, 2 the harness failed, 3 the registry or a work folder was not put back. See [Driving the twinBASIC compiler](#driving-the-twinbasic-compiler) for its rules.
 - `ide-test.bat` --- the same runner for scenarios that operate the IDE itself rather than an add-in: every lane in `test/ide/lanes.mjs`, base port 9660. Same exit codes, same standing outside every gate and outside CI, same rules.
 - `try-help-addin.bat` --- opens one IDE on the user's desktop with the help add-in built and loaded, to try it by hand, and puts the registry back once it is closed (see [Driving the twinBASIC compiler](#driving-the-twinbasic-compiler)). Needs `build.bat` first. Exit 0 closed and put back, 1 the add-in or the project did not compile, 2 the tool could not run, 3 not put back.
+- `node scripts/build_help_archive.mjs` --- writes `add-in/Resources/HELP/site.zip` from `docs/_site-offline` (refusing a stale tree) and reads it back to verify it. The help add-in embeds it as a resource and serves the pages from it with its own server; a build of the add-in without it uses the live site. The file is gitignored (about 21 MB), so a build of the add-in from a clean clone is the online one; run `build.bat` and then this to get the offline one. The zip's format is fixed by the add-in's reader, which does no inflating ([WIP.HelpAddin.md](WIP.HelpAddin.md), Stage 4, increment 5).
 - `node scripts/bug_repro.mjs` --- the reproducer projects under `bugs/<slug>/` for the entries of [BUGS-TO-REPORT.md](BUGS-TO-REPORT.md): `new`, `pack` (impexp, then the zip, written in Node), `compile`, `build` and `run` through `tbbuild` and `tbrun`, `vb6` (builds the optional `vb6/` VB6 project beside the twinBASIC one in a temp copy, runs its exe on a private desktop, and prints its `out.txt`; a project with a form or a user control is built without Unattended Execution, which VB6 refuses for it; `pack` zips its sources into `<slug>-vb6.zip`; VB6 is started only by `scripts/lib/vb6.mjs`, never from a shell; a graphical defect's `images` key makes `run` and `vb6` keep what the `PngDump` modules of `test/repro-templates/png/` draw as `images/<name>-tb.png` and `-vb6.png`, with a `-compare.png` of both, tested by `test/png.test.mjs`), `file` (moves a filed entry and its reproducer to `bugs/filed/<slug>/`; `file --marked` does every marked entry), and `verify`, which reads each `bugs/*/repro.json` and `bugs/filed/*/repro.json` and says whether the bug still reproduces on the newest beta. It has no wrapper. **`verify` is run by a person only**, never by a gate or CI: it needs a twinBASIC install, like `examples.bat`. Default port 9440, and `--jobs N` takes N ports from there. Its command-line cases are in `scripts/lib/cli-cases.mjs`, and need no IDE.
 - `node scripts/vb6run.mjs <file | ->` and `node scripts/vb6run.mjs --docs [--only <regex>]` --- build and run VB6 code, so that what a sample prints in twinBASIC can be compared with VB6: a stand-alone file of statements or a `.bas` module, or `--docs`, which builds the documentation's `check_run` fences in VB6 and says for each whether it prints what its page says (`same`, `differs`, `not VB6`, `error`, `refused`; a `projname=` group is built as a project of its own, its `slot=file` fences translated into VB6 `.cls` and `.bas` components). It has no wrapper and is outside every gate and outside CI: it needs VB6 (`--vb6`, `VB6_EXE`, or the standard install folder). **Never start `VB6.EXE` from a shell**: in Git Bash `/make` is rewritten as a path and VB6 answers with a modal box on the desktop; the tool spawns it from Node with an argument array, and a sample that calls `MsgBox` or `InputBox` or contains `End` is refused. Its `Debug.Print` rewrite and its file translation have probes in `test/example-batches.test.mjs`, and its command-line cases are in `scripts/lib/cli-cases.mjs`; both need no VB6. What it relies on is in [WIP.ExamplesBuild.md](WIP.ExamplesBuild.md).
 
diff --git a/add-in/Settings b/add-in/Settings
index 016d3ed78..6b835f144 100644
--- a/add-in/Settings
+++ b/add-in/Settings
@@ -3,7 +3,7 @@
 	"project.appTitle": "tbDocsHelp",
 	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
 	"project.buildType": "Standard DLL",
-	"project.description": "The twinBASIC documentation help add-in: F1 shows the page for the name under the cursor in a help pane, which can also search the index. WIP.HelpAddin.md is its plan. The symbol index is embedded as Resources/SYMBOLS/symbols.json, a committed copy of a docs build's tB/symbols.json.",
+	"project.description": "The twinBASIC documentation help add-in: F1 shows the page for the name under the cursor in a help pane, which can also search the index. WIP.HelpAddin.md is its plan. The symbol index is embedded as Resources/SYMBOLS/symbols.json, a committed copy of a docs build's tB/symbols.json. With Resources/HELP/site.zip, which scripts/build_help_archive.mjs writes and git ignores, the pane's pages come from the add-in's own server instead of the live site.",
 	"project.exportPathIsV2": true,
 	"project.id": "{4581D804-116B-436E-B7AB-1E4417F9703C}",
 	"project.name": "tbDocsHelp",
diff --git a/add-in/Sources/HelpAddIn.twin b/add-in/Sources/HelpAddIn.twin
index 573a1f316..c9638491a 100644
--- a/add-in/Sources/HelpAddIn.twin
+++ b/add-in/Sources/HelpAddIn.twin
@@ -4,6 +4,8 @@
 ' search. For the name under the cursor the compiler is asked where it is
 ' declared, through its hover (CompilerHover), so that c.Add finds
 ' Collection.Add when c is a Collection; a selection is looked up as it is.
+' The pages come from the add-in's own server when it was built with the help
+' archive (HelpServer), and from the live site otherwise.
 ' Every line it prints to the DEBUG CONSOLE starts "[tbDocsHelp] ", except
 ' "open <url>" (see OpenUrl).
 Private Class HelpAddIn
@@ -25,6 +27,7 @@ Private Class HelpAddIn
     Private HoverSink As HtmlElement        ' where the compiler's answers come
     Private AskSeq As Long                  ' the number of the last question
     Private Asked As String                 ' its word, "" once answered
+    Private Server As HelpServer            ' Nothing unless the add-in has the archive
 
     Private Const BASE_URL As String = "https://docs.twinbasic.com"
     Private Const TAG As String = "[tbDocsHelp] "
@@ -48,6 +51,7 @@ Private Class HelpAddIn
         Set HelpButton = Host.Toolbars(0).AddButton("tbDocsHelp", "Help")
         Host.KeyboardShortcuts.Add "f1", AddressOf OnF1
         Dim indexState As String = LoadIndex()
+        StartServer
         PageUrl = GetSetting(SETTINGS_APP, "Pane", "Page", "")
         BuildPane
         ' The scenarios wait for this line, and check the switch in it before
@@ -67,8 +71,30 @@ Private Class HelpAddIn
         Return "no index (" & Err.Description & ")"
     End Function
 
-    ' The site the pages come from. Under the test harness TB_DOCS_HELP_SITE
-    ' can name another, a copy of the site the lane serves itself.
+    ' Serves the pages from the archive, when the add-in was built with one
+    ' (HelpServer). The line it prints names the origin, which the scenarios
+    ' read.
+    Private Sub StartServer()
+        Set Server = New HelpServer
+        Dim serving As String = Server.Start()
+        If Len(serving) > 0 Then Host.DebugConsole.PrintText TAG & serving
+        If Len(Server.Origin) = 0 Then Set Server = Nothing
+    End Sub
+
+    Private Sub Class_Terminate()
+        If Not Server Is Nothing Then Server.CloseAll
+    End Sub
+
+    ' Where the pane's pages come from: the add-in's own server when it has the
+    ' archive, otherwise the site.
+    Private Function PagesUrl() As String
+        If Not Server Is Nothing Then Return Server.Origin
+        Return SiteUrl()
+    End Function
+
+    ' The site, which Open in browser always opens. Under the test harness
+    ' TB_DOCS_HELP_SITE can name another, a copy of the site the lane serves
+    ' itself.
     Private Function SiteUrl() As String
         If TestSwitchOn() Then
             Dim site As String = Environ$("TB_DOCS_HELP_SITE")
@@ -90,7 +116,7 @@ Private Class HelpAddIn
         If group = "light" Or group = "dark" Then query = "?theme=" & group & "&pane=1"
         Dim hash As Long = InStr(url, "#")
         If hash = 0 Then hash = Len(url) + 1
-        Return SiteUrl() & Left$(url, hash - 1) & query & Mid$(url, hash)
+        Return PagesUrl() & Left$(url, hash - 1) & query & Mid$(url, hash)
     End Function
 
     ' A theme change loads the page again with the new theme. The pane itself
diff --git a/add-in/Sources/HelpServer.twin b/add-in/Sources/HelpServer.twin
new file mode 100644
index 000000000..f99dbf0a5
--- /dev/null
+++ b/add-in/Sources/HelpServer.twin
@@ -0,0 +1,464 @@
+' Serves the documentation from the archive the add-in embeds as
+' Resources/HELP/site.zip, on 127.0.0.1 at a port Windows picks, so the help
+' pane needs no network. The archive is the site's offline tree, written by
+' scripts/build_help_archive.mjs. A path is found as GitHub Pages finds it:
+' /a/b is a/b.html, or a redirect to /a/b/ when a/b/index.html exists, and the
+' query string is ignored. An entry the zip deflated is sent as it is, in a
+' gzip wrapper (Content-Encoding: gzip), so nothing is inflated here.
+'
+' It listens on 127.0.0.1 and names itself http://localhost:<port>: a frame
+' on 127.0.0.1 is missing from the IDE page's frame tree, where the help lane
+' looks for the pane's page, and one on localhost is not.
+'
+' The sockets belong to the thread that starts the server, the IDE's: Winsock
+' posts their events to a message-only window (WSAAsyncSelect), so no request
+' blocks the thread. Every reply closes its connection.
+Private Class HelpServer
+    Private Declare PtrSafe Function WSAStartup Lib "ws2_32" (ByVal wVersionRequested As Integer, ByRef lpWSAData As Any) As Long
+    Private Declare PtrSafe Function WSAGetLastError Lib "ws2_32" () As Long
+    Private Declare PtrSafe Function WSAAsyncSelect Lib "ws2_32" (ByVal s As LongPtr, ByVal hWnd As LongPtr, _
+        ByVal wMsg As Long, ByVal lEvent As Long) As Long
+    Private Declare PtrSafe Function OpenSocket Lib "ws2_32" Alias "socket" (ByVal af As Long, ByVal kind As Long, _
+        ByVal protocol As Long) As LongPtr
+    Private Declare PtrSafe Function BindSocket Lib "ws2_32" Alias "bind" (ByVal s As LongPtr, ByRef name As Any, _
+        ByVal nameLength As Long) As Long
+    Private Declare PtrSafe Function ListenOn Lib "ws2_32" Alias "listen" (ByVal s As LongPtr, ByVal backlog As Long) As Long
+    Private Declare PtrSafe Function GetSockName Lib "ws2_32" Alias "getsockname" (ByVal s As LongPtr, ByRef name As Any, _
+        ByRef nameLength As Long) As Long
+    Private Declare PtrSafe Function AcceptOn Lib "ws2_32" Alias "accept" (ByVal s As LongPtr, ByVal addr As LongPtr, _
+        ByVal addrLength As LongPtr) As LongPtr
+    Private Declare PtrSafe Function Recv Lib "ws2_32" Alias "recv" (ByVal s As LongPtr, ByRef buf As Any, _
+        ByVal length As Long, ByVal flags As Long) As Long
+    Private Declare PtrSafe Function Send Lib "ws2_32" Alias "send" (ByVal s As LongPtr, ByRef buf As Any, _
+        ByVal length As Long, ByVal flags As Long) As Long
+    Private Declare PtrSafe Function ShutdownSocket Lib "ws2_32" Alias "shutdown" (ByVal s As LongPtr, ByVal how As Long) As Long
+    Private Declare PtrSafe Function CloseSocket Lib "ws2_32" Alias "closesocket" (ByVal s As LongPtr) As Long
+    Private Declare PtrSafe Function CreateWindowExW Lib "user32" (ByVal dwExStyle As Long, ByVal lpClassName As LongPtr, _
+        ByVal lpWindowName As LongPtr, ByVal dwStyle As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, _
+        ByVal nHeight As Long, ByVal hWndParent As LongPtr, ByVal hMenu As LongPtr, ByVal hInstance As LongPtr, _
+        ByVal lpParam As LongPtr) As LongPtr
+    Private Declare PtrSafe Function DestroyWindow Lib "user32" (ByVal hWnd As LongPtr) As Long
+    #If Win64 Then
+        Private Declare PtrSafe Function SetWindowProc Lib "user32" Alias "SetWindowLongPtrW" (ByVal hWnd As LongPtr, _
+            ByVal nIndex As Long, ByVal dwNewLong As LongPtr) As LongPtr
+    #Else
+        Private Declare PtrSafe Function SetWindowProc Lib "user32" Alias "SetWindowLongW" (ByVal hWnd As LongPtr, _
+            ByVal nIndex As Long, ByVal dwNewLong As LongPtr) As LongPtr
+    #End If
+    Private Declare PtrSafe Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (ByRef Destination As Any, _
+        ByRef Source As Any, ByVal Length As LongPtr)
+
+    Private Const FD_READ As Long = 1
+    Private Const FD_WRITE As Long = 2
+    Private Const FD_ACCEPT As Long = 8
+    Private Const FD_CLOSE As Long = 32
+    Private Const WSAEWOULDBLOCK As Long = 10035
+    Private Const INVALID_SOCKET As LongPtr = -1
+    Private Const SOCKET_ERROR As Long = -1
+    Private Const SD_SEND As Long = 1
+    Private Const HWND_MESSAGE As LongPtr = -3
+    Private Const GWLP_WNDPROC As Long = -4
+    Private Const MAX_REQUEST As Long = 16384   ' a request's head, at most
+    Private Const CHUNK As Long = 65536         ' sent at a time
+
+    ' A connection's state: reading its request, sending its reply, or sent and
+    ' waiting for the browser to close it.
+    Private Const READING As Long = 0
+    Private Const SENDING As Long = 1
+    Private Const SENT As Long = 2
+
+    Private Type Connection
+        Sock As LongPtr          ' 0 in a free slot
+        State As Long
+        Request As String        ' as received, one character a byte
+        Reply() As Byte
+        Done As Long             ' bytes of Reply sent
+    End Type
+
+    Private Zip() As Byte
+    Private Entries As Collection   ' an entry's number by its name
+    Private Names() As String
+    Private Method() As Long        ' 0 stored, 8 deflated
+    Private DataAt() As Long        ' where its data starts in Zip
+    Private Packed() As Long        ' its size in Zip
+    Private CentralAt() As Long     ' its central directory record, for the CRC and size
+
+    Private Listener As LongPtr
+    Private Window As LongPtr
+    Private Conns() As Connection
+    Private ConnCount As Long
+
+    ' "http://127.0.0.1:<port>" while serving, else "".
+    Public Origin As String
+    Public FileCount As Long
+
+    ' Starts serving and returns what it serves, for the DEBUG CONSOLE, or ""
+    ' when the add-in has no archive. Origin stays "" unless it is serving.
+    Public Function Start() As String
+        On Error GoTo NoArchive
+        Zip = LoadResDataInternal("site.zip", "HELP")
+        On Error GoTo Failed
+        If Not ReadDirectory() Then Err.Raise 5, , "site.zip is not an archive this add-in reads"
+        Dim wsa(1023) As Byte
+        If WSAStartup(&H202, wsa(0)) <> 0 Then Err.Raise 5, , "WSAStartup failed"
+        Listener = OpenSocket(2, 1, 6)   ' AF_INET, SOCK_STREAM, IPPROTO_TCP
+        If Listener = INVALID_SOCKET Then
+            Listener = 0
+            Fail "socket"
+        End If
+        Dim addr(15) As Byte              ' sockaddr_in for 127.0.0.1, port 0
+        addr(0) = 2
+        addr(4) = 127
+        addr(7) = 1
+        If BindSocket(Listener, addr(0), 16) <> 0 Then Fail "bind"
+        If ListenOn(Listener, 64) <> 0 Then Fail "listen"
+        Dim size As Long = 16
+        If GetSockName(Listener, addr(0), size) <> 0 Then Fail "getsockname"
+        Window = CreateWindowExW(0, StrPtr("STATIC"), 0, 0, 0, 0, 0, 0, HWND_MESSAGE, 0, 0, 0)
+        If Window = 0 Then Err.Raise 5, , "CreateWindowExW failed"
+        Set HelpServerWindow.Server = Me
+        HelpServerWindow.PreviousProc = SetWindowProc(Window, GWLP_WNDPROC, AddressOf HelpServerWindow.WndProc)
+        If WSAAsyncSelect(Listener, Window, HelpServerWindow.WM_SOCKET, FD_ACCEPT) <> 0 Then Fail "WSAAsyncSelect"
+        Origin = "http://localhost:" & (CLng(addr(2)) * 256 + addr(3))
+        Return "serving site.zip, " & FileCount & " files, at " & Origin
+    NoArchive:
+        Return ""
+    Failed:
+        Dim message As String = Err.Description
+        CloseAll
+        Return "not serving site.zip (" & message & ")"
+    End Function
+
+    Private Sub Fail(ByVal what As String)
+        Err.Raise 5, , what & " failed, Winsock error " & WSAGetLastError()
+    End Sub
+
+    Public Sub CloseAll()
+        Dim i As Long
+        For i = 0 To ConnCount - 1
+            If Conns(i).Sock <> 0 Then CloseSocket Conns(i).Sock
+        Next
+        ConnCount = 0
+        Erase Conns
+        If Listener <> 0 Then CloseSocket Listener
+        Listener = 0
+        If Window <> 0 Then DestroyWindow Window
+        Window = 0
+        If HelpServerWindow.Server Is Me Then Set HelpServerWindow.Server = Nothing
+        Origin = ""
+    End Sub
+
+    ' ---- the archive ----
+
+    ' Reads the central directory: no zip64, no data descriptors, the entries
+    ' as build_help_archive.mjs writes them.
+    Private Function ReadDirectory() As Boolean
+        Dim eocd As Long = UBound(Zip) + 1 - 22
+        Do While eocd >= 0
+            If U32(eocd) = &H06054B50 Then Exit Do
+            eocd = eocd - 1
+        Loop
+        If eocd < 0 Then Return False
+        Dim count As Long = U16(eocd + 10)
+        If count = 0 Then Return False
+        Dim at As Long = U32(eocd + 16)
+        ReDim Names(count - 1)
+        ReDim Method(count - 1)
+        ReDim DataAt(count - 1)
+        ReDim Packed(count - 1)
+        ReDim CentralAt(count - 1)
+        Set Entries = New Collection
+        Dim i As Long
+        For i = 0 To count - 1
+            If U32(at) <> &H02014B50 Then Return False
+            Dim nameLength As Long = U16(at + 28)
+            Dim header As Long = U32(at + 42)
+            If U32(header) <> &H04034B50 Then Return False
+            Names(i) = Utf8(at + 46, nameLength)
+            Method(i) = U16(at + 10)
+            If Method(i) <> 0 And Method(i) <> 8 Then Return False
+            Packed(i) = U32(at + 20)
+            CentralAt(i) = at
+            DataAt(i) = header + 30 + U16(header + 26) + U16(header + 28)
+            Entries.Add i, Names(i)
+            at = at + 46 + nameLength + U16(at + 30) + U16(at + 32)
+        Next
+        FileCount = count
+        Return True
+    End Function
+
+    Private Function U16(ByVal at As Long) As Long
+        Return Zip(at) Or CLng(Zip(at + 1)) * &H100&
+    End Function
+
+    ' Offsets and sizes only: an archive under 2 GB keeps them below &H80000000.
+    Private Function U32(ByVal at As Long) As Long
+        Return Zip(at) Or CLng(Zip(at + 1)) * &H100& Or CLng(Zip(at + 2)) * &H10000 Or CLng(Zip(at + 3)) * &H1000000
+    End Function
+
+    Private Function Utf8(ByVal at As Long, ByVal length As Long) As String
+        If length = 0 Then Return ""
+        Dim b() As Byte
+        ReDim b(length - 1)
+        CopyMemory b(0), Zip(at), length
+        Return StrConv(b, VbStrConv.vbFromUTF8)
+    End Function
+
+    Private Function Lookup(ByVal name As String) As Long
+        On Error GoTo Missing
+        Return Entries(name)
+    Missing:
+        Return -1
+    End Function
+
+    ' ---- the sockets ----
+
+    ' Called by HelpServerWindow.WndProc for each event Winsock posts.
+    Public Sub OnSocket(ByVal sock As LongPtr, ByVal events As Long, ByVal failure As Long)
+        Dim i As Long = -1
+        On Error GoTo Failed
+        If sock = Listener Then
+            If events = FD_ACCEPT And failure = 0 Then AcceptOne
+            Exit Sub
+        End If
+        i = Slot(sock)
+        If i < 0 Then Exit Sub
+        If failure <> 0 Then
+            Drop i
+            Exit Sub
+        End If
+        Select Case events
+            Case FD_READ
+                Receive i
+            Case FD_WRITE
+                Pump i
+            Case FD_CLOSE
+                Drop i
+        End Select
+        Exit Sub
+    Failed:
+        If i >= 0 Then Drop i
+    End Sub
+
+    Private Sub AcceptOne()
+        Dim s As LongPtr = AcceptOn(Listener, 0, 0)
+        If s = INVALID_SOCKET Then Exit Sub
+        If WSAAsyncSelect(s, Window, HelpServerWindow.WM_SOCKET, FD_READ Or FD_WRITE Or FD_CLOSE) <> 0 Then
+            CloseSocket s
+            Exit Sub
+        End If
+        Dim i As Long = Slot(0)
+        If i < 0 Then
+            i = ConnCount
+            ConnCount = ConnCount + 1
+            ReDim Preserve Conns(ConnCount - 1)
+        End If
+        Conns(i).Sock = s
+        Conns(i).State = READING
+        Conns(i).Request = ""
+        Conns(i).Done = 0
+    End Sub
+
+    Private Function Slot(ByVal sock As LongPtr) As Long
+        Dim i As Long
+        For i = 0 To ConnCount - 1
+            If Conns(i).Sock = sock Then Return i
+        Next
+        Return -1
+    End Function
+
+    Private Sub Drop(ByVal i As Long)
+        If Conns(i).Sock <> 0 Then CloseSocket Conns(i).Sock
+        Conns(i).Sock = 0
+        Conns(i).State = READING
+        Conns(i).Request = ""
+        Erase Conns(i).Reply
+        Conns(i).Done = 0
+    End Sub
+
+    Private Sub Receive(ByVal i As Long)
+        Dim buf(4095) As Byte
+        Dim n As Long = Recv(Conns(i).Sock, buf(0), 4096, 0)
+        If n = 0 Then
+            Drop i
+            Exit Sub
+        End If
+        If n < 0 Then
+            If WSAGetLastError() <> WSAEWOULDBLOCK Then Drop i
+            Exit Sub
+        End If
+        If Conns(i).State <> READING Then Exit Sub   ' anything after the request's head is ignored
+        Dim k As Long
+        For k = 0 To n - 1
+            Conns(i).Request = Conns(i).Request & ChrW$(buf(k))
+        Next
+        If InStr(Conns(i).Request, vbCrLf & vbCrLf) = 0 Then
+            If Len(Conns(i).Request) > MAX_REQUEST Then Drop i
+            Exit Sub
+        End If
+        Conns(i).Reply = Answer(Left$(Conns(i).Request, InStr(Conns(i).Request, vbCrLf) - 1))
+        Conns(i).Request = ""
+        Conns(i).State = SENDING
+        Pump i
+    End Sub
+
+    ' Sends what the socket takes; FD_WRITE calls it again for the rest. Once
+    ' all is sent, the browser closes the connection (FD_CLOSE).
+    Private Sub Pump(ByVal i As Long)
+        If Conns(i).State <> SENDING Then Exit Sub
+        Dim size As Long = UBound(Conns(i).Reply) + 1
+        Do While Conns(i).Done < size
+            Dim length As Long = size - Conns(i).Done
+            If length > CHUNK Then length = CHUNK
+            Dim n As Long = Send(Conns(i).Sock, Conns(i).Reply(Conns(i).Done), length, 0)
+            If n = SOCKET_ERROR Then
+                If WSAGetLastError() <> WSAEWOULDBLOCK Then Drop i
+                Exit Sub
+            End If
+            Conns(i).Done = Conns(i).Done + n
+        Loop
+        Erase Conns(i).Reply
+        Conns(i).State = SENT
+        ShutdownSocket Conns(i).Sock, SD_SEND
+    End Sub
+
+    ' ---- HTTP ----
+
+    Private Function Answer(ByVal requestLine As String) As Byte()
+        On Error GoTo BadRequest
+        Dim parts() As String = Split(requestLine, " ")
+        If UBound(parts) <> 2 Then GoTo BadRequest
+        If parts(0) <> "GET" And parts(0) <> "HEAD" Then Return Reply("405 Method Not Allowed", -1, False)
+        Dim headOnly As Boolean = parts(0) = "HEAD"
+        Dim target As String = parts(1)
+        Dim query As String
+        Dim q As Long = InStr(target, "?")
+        If q > 0 Then
+            query = Mid$(target, q)
+            target = Left$(target, q - 1)
+        End If
+        Dim path As String = Unescape(target)
+        If Left$(path, 1) <> "/" Or InStr(path, "..") > 0 Or InStr(path, "\") > 0 Then
+            Return Reply("404 Not Found", Lookup("404.html"), headOnly)
+        End If
+        Dim name As String = Mid$(path, 2)
+        If Len(name) = 0 Or Right$(name, 1) = "/" Then name = name & "index.html"
+        Dim i As Long = Lookup(name)
+        If i < 0 And InStr(Mid$(name, InStrRev(name, "/") + 1), ".") = 0 Then
+            i = Lookup(name & ".html")
+            If i < 0 And Lookup(name & "/index.html") >= 0 Then
+                Return Reply("301 Moved Permanently", -1, headOnly, target & "/" & query)
+            End If
+        End If
+        If i < 0 Then Return Reply("404 Not Found", Lookup("404.html"), headOnly)
+        Return Reply("200 OK", i, headOnly)
+    BadRequest:
+        Return Reply("400 Bad Request", -1, False)
+    End Function
+
+    ' The reply's bytes: the head and, unless headOnly, the entry's data, which
+    ' a deflated entry sends between a gzip header and its CRC32 and size.
+    Private Function Reply(ByVal status As String, ByVal entry As Long, ByVal headOnly As Boolean, _
+                           Optional ByVal location As String = "") As Byte()
+        Dim head As String = "HTTP/1.1 " & status & vbCrLf
+        Dim gzip As Boolean
+        Dim bodySize As Long
+        If entry >= 0 Then
+            gzip = Method(entry) = 8
+            bodySize = Packed(entry) + IIf(gzip, 18, 0)
+            head = head & "Content-Type: " & ContentType(Names(entry)) & vbCrLf
+            If gzip Then head = head & "Content-Encoding: gzip" & vbCrLf
+            head = head & "Cache-Control: max-age=3600" & vbCrLf
+        End If
+        If Len(location) > 0 Then head = head & "Location: " & location & vbCrLf
+        head = head & "Content-Length: " & bodySize & vbCrLf & "Connection: close" & vbCrLf & vbCrLf
+        Dim headLength As Long = Len(head)
+        Dim out() As Byte
+        ReDim out(headLength + IIf(headOnly, 0, bodySize) - 1)
+        Dim k As Long
+        For k = 1 To headLength
+            out(k - 1) = AscW(Mid$(head, k, 1)) And &HFF
+        Next
+        If headOnly Or entry < 0 Then Return out
+        Dim p As Long = headLength
+        If gzip Then
+            out(p) = &H1F
+            out(p + 1) = &H8B
+            out(p + 2) = 8
+            out(p + 9) = &HFF   ' flags, time and extra flags 0, OS unknown
+            p = p + 10
+        End If
+        If Packed(entry) > 0 Then CopyMemory out(p), Zip(DataAt(entry)), Packed(entry)
+        p = p + Packed(entry)
+        If gzip Then
+            CopyMemory out(p), Zip(CentralAt(entry) + 16), 4       ' CRC32
+            CopyMemory out(p + 4), Zip(CentralAt(entry) + 24), 4   ' uncompressed size
+        End If
+        Return out
+    End Function
+
+    ' A request path's %XX escapes decoded, as UTF-8.
+    Private Function Unescape(ByVal s As String) As String
+        If Len(s) = 0 Then Return ""
+        Dim b() As Byte
+        ReDim b(Len(s) - 1)
+        Dim n As Long, k As Long = 1
+        Do While k <= Len(s)
+            Dim c As String = Mid$(s, k, 1)
+            If c = "%" Then
+                b(n) = CByte("&H" & Mid$(s, k + 1, 2))
+                k = k + 3
+            Else
+                b(n) = AscW(c) And &HFF
+                k = k + 1
+            End If
+            n = n + 1
+        Loop
+        ReDim Preserve b(n - 1)
+        Return StrConv(b, VbStrConv.vbFromUTF8)
+    End Function
+
+    Private Function ContentType(ByVal name As String) As String
+        Select Case LCase$(Mid$(name, InStrRev(name, ".") + 1))
+            Case "html": Return "text/html; charset=utf-8"
+            Case "css": Return "text/css; charset=utf-8"
+            Case "js": Return "text/javascript; charset=utf-8"
+            Case "json": Return "application/json"
+            Case "svg": Return "image/svg+xml"
+            Case "png": Return "image/png"
+            Case "jpg", "jpeg": Return "image/jpeg"
+            Case "gif": Return "image/gif"
+            Case "webp": Return "image/webp"
+            Case "ico": Return "image/x-icon"
+            Case "woff2": Return "font/woff2"
+            Case "woff": Return "font/woff"
+            Case "txt", "dot": Return "text/plain; charset=utf-8"
+            Case "xml": Return "application/xml"
+            Case "pdf": Return "application/pdf"
+            Case "mp4": Return "video/mp4"
+            Case Else: Return "application/octet-stream"
+        End Select
+    End Function
+End Class
+
+' The procedure of HelpServer's message-only window: Winsock's events go to
+' the server, every other message to the window's own procedure.
+Module HelpServerWindow
+    Private Declare PtrSafe Function CallWindowProcW Lib "user32" (ByVal lpPrevWndFunc As LongPtr, ByVal hWnd As LongPtr, _
+        ByVal uMsg As Long, ByVal wParam As LongPtr, ByVal lParam As LongPtr) As LongPtr
+
+    Public Const WM_SOCKET As Long = &H8001&   ' WM_APP + 1
+    Public Server As HelpServer
+    Public PreviousProc As LongPtr
+
+    Public Function WndProc(ByVal hWnd As LongPtr, ByVal uMsg As Long, ByVal wParam As LongPtr, _
+                            ByVal lParam As LongPtr) As LongPtr
+        If uMsg = WM_SOCKET Then
+            If Not Server Is Nothing Then
+                Server.OnSocket wParam, CLng(lParam And &HFFFF&), CLng((lParam \ &H10000) And &HFFFF&)
+            End If
+            Return 0
+        End If
+        Return CallWindowProcW(PreviousProc, hWnd, uMsg, wParam, lParam)
+    End Function
+End Module
diff --git a/docs/Documentation/Tools.md b/docs/Documentation/Tools.md
index 30aaf64c4..9022e5755 100644
--- a/docs/Documentation/Tools.md
+++ b/docs/Documentation/Tools.md
@@ -802,6 +802,19 @@ It shares [`census_attributes.mjs`](#census-attributes)'s export and cache, and
 
 Exit codes: **0** the file was written (with `--check`, it is up to date); **1** with `--check`, the file is stale; **2** a refused command line, no install, an export that failed, packages that declare different APIs under one name, or a crash.
 
+### build_help_archive.mjs
+{: #build-help-archive }
+
+    node scripts/build_help_archive.mjs [--src <dir>] [--out <file>]
+
+Writes the zip the IDE help add-in serves the documentation from. The add-in embeds `add-in/Resources/HELP/site.zip` in its DLL as a resource, and this tool builds that file from the built offline tree, `docs/_site-offline/` by default. Run [`build.bat`](#buildbat) first: the tool runs [`check_tree_fresh.mjs`](#check-tree-fresh) on the tree, as [`book.bat`](#bookbat) does, and refuses a tree older than its sources. The zip is not committed, because it is too large; `add-in/Resources/HELP/` is listed in `.gitignore`.
+
+The reader on the twinBASIC side does no inflating of its own, so the format is fixed. There is one entry per file and no directory entries. A name is relative to the tree root, uses forward slashes and is UTF-8, with general-purpose flag bit 11 set. Entries are sorted by name in code-unit order, so the same tree gives the same bytes. The DOS date and time are always 1980-01-01 00:00, the version made by and needed is 20, and there are no extra fields, no comments and no data descriptors: the CRC-32 and both sizes are in the local header and in the central directory. There is no zip64, so a tree of more than 65,535 files, or an archive of 4 GB, is refused. Files that are compressed already (`.png`, `.jpg`, `.jpeg`, `.gif`, `.webp`, `.ico`, `.woff2`, `.woff`, `.mp4`, `.zip`, `.pdf`) are stored. Every other file is deflated at level 9, and stored instead when the deflated data is not smaller than the file.
+
+After the file is written, the tool reads it back. It parses the end record and every central-directory entry, checks that each local header agrees with its entry (name, method, sizes, CRC-32), and inflates each deflated entry. It compares each entry's content and CRC-32 with the source file's bytes, and names any entry that differs. This check always runs. The file is written under a temporary name beside the target and renamed, so a failed run never leaves a half-written archive. The summary line gives the number of entries, the raw and zipped sizes in MB (with the part stored as it was), and the time.
+
+Exit codes: **0** the archive was written and verified; **1** the verification found a difference; **2** the tool could not do its job: a refused command line, a stale or missing tree, a tree too large for a zip without zip64, or a crash.
+
 ### convert_em_dash_separators.mjs
 {: #convert-em-dash-separators }
 
@@ -1179,9 +1192,12 @@ build target loads, what a compiler restart does to a loaded add-in, and which e
 names the IDE accepts. They build add-ins for win64 as well as win32, restart the compiler,
 and patch a built DLL's export name. One more checks that the environment variable the
 runner sets, which keeps an add-in under test from opening a browser, reaches the add-in,
-also after a compiler restart. The last lane tests the help add-in in `add-in/`, which opens
-the page for the name under the cursor, with the copy of the symbol index committed in
-`add-in/Resources/SYMBOLS/`. The twelve lanes take about two minutes together.
+also after a compiler restart. The last two lanes test the help add-in in `add-in/`, which
+opens the page for the name under the cursor, with the copy of the symbol index committed in
+`add-in/Resources/SYMBOLS/`: `help` with the pages from the built site, and `help-offline`
+with the pages from the add-in's own server, built with an archive that
+[`build_help_archive.mjs`](#build-help-archive) makes. The thirteen lanes take about two
+minutes together.
 
 | Flag | Effect |
 |---|---|
diff --git a/scripts/build_help_archive.mjs b/scripts/build_help_archive.mjs
new file mode 100644
index 000000000..86b85a080
--- /dev/null
+++ b/scripts/build_help_archive.mjs
@@ -0,0 +1,359 @@
+#!/usr/bin/env node
+// Write the help add-in's documentation archive: the built offline tree as a zip.
+//
+//     node scripts/build_help_archive.mjs [--src <dir>] [--out <file>]
+//
+//       --src <dir>    the tree to archive (default docs/_site-offline)
+//       --out <file>   the zip to write (default add-in/Resources/HELP/site.zip)
+//
+// The IDE help add-in serves the documentation offline from this zip, embedded in
+// its DLL as the resource HELP/site.zip (a twinBASIC project embeds
+// Resources/<TYPE>/<name> as a resource). The reader on the twinBASIC side does no
+// inflating of its own, so the format is a contract, and this tool keeps to the
+// letter of it:
+//
+//   - one entry per file, no directory entries, names relative to the tree root
+//     with forward slashes, UTF-8 with general-purpose flag bit 11 set, sorted by
+//     name in code-unit order, so the same tree gives the same bytes;
+//   - a fixed DOS date and time (1980-01-01 00:00), version made by and needed 20,
+//     no extra fields, no comments, and no data descriptors: the CRC-32 and both
+//     sizes are in the local header and in the central directory;
+//   - no zip64: more than 65,535 entries, or 4 GB, is refused;
+//   - method 0 (stored) for files that are compressed already, method 8 (raw
+//     deflate, level 9) for the rest, unless the deflated data is not smaller than
+//     the file, in which case it is stored.
+//
+// scripts/lib/zip.mjs deflates everything and is shared with other tools, so this
+// writes its own.
+//
+// Nothing here trusts what it wrote. After the rename, the file is read back: the
+// end record, every central-directory entry and every local header are parsed and
+// compared with each other and with the tree, and each deflated entry is inflated
+// and compared, with its CRC-32, with the source file's bytes. That always runs.
+//
+// A stale tree is refused as book.bat refuses one, by running
+// scripts/check_tree_fresh.mjs against it, so the archive is never a previous
+// build's.
+//
+// Exit codes: 0 written and verified, 1 the verification found a difference,
+// 2 the tool could not do its job (a refused command line, a stale or missing
+// tree, a tree too large for a zip without zip64, or a crash).
+
+import { spawnSync } from "node:child_process";
+import { mkdirSync, readdirSync, readFileSync, renameSync, rmSync, statSync, writeFileSync } from "node:fs";
+import path from "node:path";
+import zlib from "node:zlib";
+
+import { die, exitOnCrash, parseCli, printHelpAndExit, withUsageError } from "../lib/cli.mjs";
+import { REPO_ROOT } from "../lib/repo-paths.mjs";
+
+exitOnCrash();
+
+const DEFAULT_SRC = path.join(REPO_ROOT, "docs", "_site-offline");
+const DEFAULT_OUT = path.join(REPO_ROOT, "add-in", "Resources", "HELP", "site.zip");
+
+// Files that are compressed already; deflating them costs time and gains nothing.
+const STORED_EXTENSIONS = new Set([
+  ".png",
+  ".jpg",
+  ".jpeg",
+  ".gif",
+  ".webp",
+  ".ico",
+  ".woff2",
+  ".woff",
+  ".mp4",
+  ".zip",
+  ".pdf",
+]);
+
+const MAX_ENTRIES = 0xffff;
+const MAX_BYTES = 0xffffffff;
+
+// 1980-01-01 00:00: day 1 of month 1 of year 0 since 1980, and time 0.
+const DOS_TIME = 0;
+const DOS_DATE = (0 << 9) | (1 << 5) | 1;
+const VERSION = 20;
+const FLAG_UTF8 = 0x0800;
+
+const SIG_LOCAL = 0x04034b50;
+const SIG_CENTRAL = 0x02014b50;
+const SIG_END = 0x06054b50;
+
+const USAGE = `usage: node scripts/build_help_archive.mjs [--src <dir>] [--out <file>] [-h, --help]
+
+Writes the built offline tree as the zip the IDE help add-in embeds, then reads
+the zip back and checks every entry against the tree.
+
+  --src <dir>    the tree to archive (default docs/_site-offline)
+  --out <file>   the zip to write (default add-in/Resources/HELP/site.zip)
+
+Run build.bat first: a tree older than its sources is refused.
+
+Exit codes:
+  0  the archive was written and verified
+  1  the verification found a difference
+  2  the tool could not do its job: a refused command line, a stale or missing
+     tree, a tree too large for a zip without zip64, or a crash`;
+
+const cli = withUsageError(() =>
+  parseCli(process.argv.slice(2), {
+    options: {
+      src: { type: "string", default: DEFAULT_SRC },
+      out: { type: "string", default: DEFAULT_OUT },
+      help: { type: "boolean", short: "h" },
+    },
+    stopAt: ["help"],
+  }),
+);
+if (cli.stopped === "help") printHelpAndExit(USAGE);
+
+const srcDir = path.resolve(cli.values.src);
+const outFile = path.resolve(cli.values.out);
+const display = (p) => (path.relative(REPO_ROOT, p) || ".").split(path.sep).join("/");
+
+/** Runs the freshness gate book.bat runs, on the tree to archive. */
+function requireFreshTree() {
+  const gate = path.join(REPO_ROOT, "scripts", "check_tree_fresh.mjs");
+  const result = spawnSync(process.execPath, [gate, "--tree", srcDir], { stdio: "inherit" });
+  if (result.error) throw result.error;
+  if (result.status !== 0) die(2, `build_help_archive: ${display(srcDir)} is stale or missing; run build.bat first.`);
+}
+
+/** Every file under `dir`, as { name, file }, `name` relative with forward slashes, in code-unit order. */
+function listFiles(dir) {
+  const found = [];
+  const walk = (d, prefix) => {
+    for (const e of readdirSync(d, { withFileTypes: true })) {
+      const file = path.join(d, e.name);
+      const name = prefix + e.name;
+      if (e.isDirectory()) walk(file, `${name}/`);
+      else if (e.isFile()) found.push({ name, file });
+    }
+  };
+  walk(dir, "");
+  return found.sort((a, b) => (a.name < b.name ? -1 : a.name > b.name ? 1 : 0));
+}
+
+const isStoredType = (name) => STORED_EXTENSIONS.has(path.extname(name).toLowerCase());
+
+/** Builds the archive, and returns it with the counts the summary prints. */
+function buildArchive(files) {
+  const parts = [];
+  const central = [];
+  let offset = 0;
+  let rawBytes = 0;
+  let storedBytes = 0;
+  for (const { name, file } of files) {
+    const nameBytes = Buffer.from(name, "utf8");
+    if (nameBytes.length > 0xffff) die(2, `build_help_archive: the name is too long for a zip entry: ${name}`);
+    const data = readFileSync(file);
+    const crc = zlib.crc32(data);
+    let method = 0;
+    let body = data;
+    if (!isStoredType(name) && data.length > 0) {
+      const deflated = zlib.deflateRawSync(data, { level: 9 });
+      if (deflated.length < data.length) {
+        method = 8;
+        body = deflated;
+      }
+    }
+    if (method === 0) storedBytes += body.length;
+    rawBytes += data.length;
+
+    const local = Buffer.alloc(30);
+    local.writeUInt32LE(SIG_LOCAL, 0);
+    local.writeUInt16LE(VERSION, 4);
+    local.writeUInt16LE(FLAG_UTF8, 6);
+    local.writeUInt16LE(method, 8);
+    local.writeUInt16LE(DOS_TIME, 10);
+    local.writeUInt16LE(DOS_DATE, 12);
+    local.writeUInt32LE(crc, 14);
+    local.writeUInt32LE(body.length, 18);
+    local.writeUInt32LE(data.length, 22);
+    local.writeUInt16LE(nameBytes.length, 26);
+    local.writeUInt16LE(0, 28);
+
+    const entry = Buffer.alloc(46);
+    entry.writeUInt32LE(SIG_CENTRAL, 0);
+    entry.writeUInt16LE(VERSION, 4);
+    entry.writeUInt16LE(VERSION, 6);
+    entry.writeUInt16LE(FLAG_UTF8, 8);
+    entry.writeUInt16LE(method, 10);
+    entry.writeUInt16LE(DOS_TIME, 12);
+    entry.writeUInt16LE(DOS_DATE, 14);
+    entry.writeUInt32LE(crc, 16);
+    entry.writeUInt32LE(body.length, 20);
+    entry.writeUInt32LE(data.length, 24);
+    entry.writeUInt16LE(nameBytes.length, 28);
+    // extra length, comment length, disk number, internal and external attributes: 0
+    entry.writeUInt32LE(offset, 42);
+    central.push(entry, nameBytes);
+
+    parts.push(local, nameBytes, body);
+    offset += local.length + nameBytes.length + body.length;
+    if (offset > MAX_BYTES) die(2, `build_help_archive: the archive passes 4 GB, which needs zip64.`);
+  }
+  const centralBytes = Buffer.concat(central);
+  if (offset + centralBytes.length + 22 > MAX_BYTES)
+    die(2, `build_help_archive: the archive passes 4 GB, which needs zip64.`);
+  const end = Buffer.alloc(22);
+  end.writeUInt32LE(SIG_END, 0);
+  end.writeUInt16LE(files.length, 8);
+  end.writeUInt16LE(files.length, 10);
+  end.writeUInt32LE(centralBytes.length, 12);
+  end.writeUInt32LE(offset, 16);
+  return { zip: Buffer.concat([...parts, centralBytes, end]), rawBytes, storedBytes };
+}
+
+/** Reads the file back and returns the differences found, each naming its entry. */
+function verifyArchive(zipFile, files) {
+  const problems = [];
+  const zip = readFileSync(zipFile);
+  const bad = (name, text) => problems.push(`${name}: ${text}`);
+
+  if (zip.length < 22 || zip.readUInt32LE(zip.length - 22) !== SIG_END) {
+    return ["(archive): the end-of-central-directory record is not where it should be"];
+  }
+  const endAt = zip.length - 22;
+  const total = zip.readUInt16LE(endAt + 10);
+  const cdSize = zip.readUInt32LE(endAt + 12);
+  const cdOffset = zip.readUInt32LE(endAt + 16);
+  if (zip.readUInt16LE(endAt + 8) !== total)
+    bad("(archive)", "the end record counts entries on this disk and in all differently");
+  if (zip.readUInt16LE(endAt + 20) !== 0) bad("(archive)", "the archive has a comment");
+  if (total !== files.length) bad("(archive)", `the archive holds ${total} entries, the tree ${files.length} files`);
+  if (cdOffset + cdSize !== endAt) bad("(archive)", "the central directory does not end at the end record");
+
+  let at = cdOffset;
+  let expectLocal = 0;
+  let previous = null;
+  for (let i = 0; i < total; i++) {
+    if (at + 46 > endAt || zip.readUInt32LE(at) !== SIG_CENTRAL) {
+      bad(`(entry ${i})`, "the central-directory record is missing or malformed");
+      break;
+    }
+    const rec = at;
+    const flags = zip.readUInt16LE(at + 8);
+    const method = zip.readUInt16LE(at + 10);
+    const crc = zip.readUInt32LE(at + 16);
+    const csize = zip.readUInt32LE(at + 20);
+    const usize = zip.readUInt32LE(at + 24);
+    const nameLen = zip.readUInt16LE(at + 28);
+    const extraLen = zip.readUInt16LE(at + 30);
+    const commentLen = zip.readUInt16LE(at + 32);
+    const localAt = zip.readUInt32LE(at + 42);
+    const name = zip.toString("utf8", at + 46, at + 46 + nameLen);
+    const listed = files[i];
+    at += 46 + nameLen + extraLen + commentLen;
+
+    if (!listed || listed.name !== name) {
+      bad(name, `the entry is not the tree's file number ${i + 1}${listed ? ` (${listed.name})` : ""}`);
+      continue;
+    }
+    if (previous !== null && !(previous < name)) bad(name, "the entries are not in name order");
+    previous = name;
+    if (name.endsWith("/")) bad(name, "the entry is a directory");
+    if (flags !== FLAG_UTF8) bad(name, `the flags are 0x${flags.toString(16)}, not 0x800`);
+    if (zip.readUInt16LE(rec + 4) !== VERSION) bad(name, "the version made by is not 20");
+    if (zip.readUInt16LE(rec + 6) !== VERSION) bad(name, "the version needed is not 20");
+    if (extraLen !== 0 || commentLen !== 0) bad(name, "the central record has an extra field or a comment");
+    if (zip.readUInt16LE(rec + 12) !== DOS_TIME) bad(name, "the DOS time is not 00:00");
+    if (zip.readUInt16LE(rec + 14) !== DOS_DATE) bad(name, "the DOS date is not 1980-01-01");
+    if (method !== 0 && method !== 8) bad(name, `the method is ${method}`);
+    if (method === 0 && csize !== usize) bad(name, "a stored entry's sizes differ");
+
+    // The local header must agree with the central record.
+    if (localAt !== expectLocal)
+      bad(name, `the local header is at ${localAt}, not ${expectLocal} where the previous entry ends`);
+    if (localAt + 30 > cdOffset || zip.readUInt32LE(localAt) !== SIG_LOCAL) {
+      bad(name, "the local header is missing or malformed");
+      continue;
+    }
+    const lFlags = zip.readUInt16LE(localAt + 6);
+    const lMethod = zip.readUInt16LE(localAt + 8);
+    const lCrc = zip.readUInt32LE(localAt + 14);
+    const lCsize = zip.readUInt32LE(localAt + 18);
+    const lUsize = zip.readUInt32LE(localAt + 22);
+    const lNameLen = zip.readUInt16LE(localAt + 26);
+    const lExtraLen = zip.readUInt16LE(localAt + 28);
+    const lName = zip.toString("utf8", localAt + 30, localAt + 30 + lNameLen);
+    if (lName !== name) bad(name, `the local header names ${lName}`);
+    if (lFlags !== flags) bad(name, "the local header's flags differ");
+    if (lMethod !== method) bad(name, "the local header's method differs");
+    if (lCrc !== crc) bad(name, "the local header's CRC-32 differs");
+    if (lCsize !== csize || lUsize !== usize) bad(name, "the local header's sizes differ");
+    if (lExtraLen !== 0) bad(name, "the local header has an extra field");
+    const dataAt = localAt + 30 + lNameLen + lExtraLen;
+    expectLocal = dataAt + csize;
+    if (expectLocal > cdOffset) {
+      bad(name, "the data runs past the central directory");
+      continue;
+    }
+
+    // And with the file in the tree.
+    const source = readFileSync(listed.file);
+    const stored = zip.subarray(dataAt, dataAt + csize);
+    let content = null;
+    if (method === 0) content = stored;
+    else if (method === 8) {
+      try {
+        content = zlib.inflateRawSync(stored);
+      } catch (err) {
+        bad(name, `the data does not inflate: ${err.message}`);
+        continue;
+      }
+      if (csize >= source.length) bad(name, "the entry is deflated and not smaller than the file");
+    }
+    if (content === null) continue;
+    if (content.length !== usize) bad(name, `the data is ${content.length} bytes, the record says ${usize}`);
+    if (!content.equals(source)) bad(name, "the content differs from the file in the tree");
+    if (zlib.crc32(source) !== crc) bad(name, "the CRC-32 differs from the file's");
+    if (zlib.crc32(content) !== crc) bad(name, "the CRC-32 differs from the data's");
+  }
+  if (problems.length === 0 && expectLocal !== cdOffset)
+    bad("(archive)", "the entries do not fill the space before the central directory");
+  return problems;
+}
+
+const started = Date.now();
+requireFreshTree();
+
+let files;
+try {
+  files = listFiles(srcDir);
+} catch (err) {
+  die(2, `build_help_archive: cannot read ${display(srcDir)}: ${err.message}`);
+}
+if (files.length === 0) die(2, `build_help_archive: ${display(srcDir)} holds no files.`);
+if (files.length > MAX_ENTRIES) {
+  die(2, `build_help_archive: ${files.length} files is more than a zip without zip64 holds (${MAX_ENTRIES}).`);
+}
+
+const { zip, rawBytes, storedBytes } = buildArchive(files);
+
+mkdirSync(path.dirname(outFile), { recursive: true });
+const temp = `${outFile}.${process.pid}.tmp`;
+try {
+  writeFileSync(temp, zip);
+  renameSync(temp, outFile);
+} catch (err) {
+  rmSync(temp, { force: true });
+  throw err;
+}
+
+const problems = verifyArchive(outFile, files);
+const mb = (n) => (n / 1048576).toFixed(1);
+const seconds = ((Date.now() - started) / 1000).toFixed(1);
+console.log(
+  `build_help_archive: ${files.length} entries, ${mb(rawBytes)} MB raw, ${mb(statSync(outFile).size)} MB zip (${mb(storedBytes)} MB stored), ${seconds} s -> ${display(outFile)}`,
+);
+if (problems.length > 0) {
+  console.error(
+    `build_help_archive: the archive does not match the tree: ${problems.length} problem${problems.length === 1 ? "" : "s"}`,
+  );
+  for (const p of problems.slice(0, 50)) console.error(`  ${p}`);
+  if (problems.length > 50) console.error(`  ... and ${problems.length - 50} more`);
+  process.exit(1);
+}
+console.log("build_help_archive: verified.");
diff --git a/scripts/lib/cli-cases.mjs b/scripts/lib/cli-cases.mjs
index a35214864..d7e6af3ff 100644
--- a/scripts/lib/cli-cases.mjs
+++ b/scripts/lib/cli-cases.mjs
@@ -70,6 +70,7 @@ const CASES = [
   { tool: "scripts/check_tree_fresh.mjs", args: ["--bogus"], exit: 2, stderr: "unknown option: --bogus\n" },
   { tool: "scripts/check_tree_fresh.mjs", args: ["--source"], exit: 2, stderr: "--source needs a value\n" },
   { tool: "scripts/check_tree_fresh.mjs", args: ["--tree"], exit: 2, stderr: "--tree needs a value\n" },
+  { tool: "scripts/build_help_archive.mjs", args: ["--out="], exit: 2, stderr: "--out needs a non-empty value\n" },
   { tool: "scripts/pick_a11y_sample.mjs", args: ["--help"], exit: 0, stdout: /^usage: node scripts\/pick_a11y_sample\.mjs / },
   { tool: "scripts/pick_a11y_sample.mjs", args: ["--bogus"], exit: 2, stderr: "unknown option: --bogus\n" },
   { tool: "scripts/pick_a11y_sample.mjs", args: ["--budget"], exit: 2, stderr: "--budget needs a value\n" },
@@ -339,6 +340,7 @@ const HELP_TOOLS = {
   "scripts/try_help_addin.mjs": null,
   "scripts/bug_repro.mjs": null,
   "scripts/build_dot_metrics.mjs": null,
+  "scripts/build_help_archive.mjs": null,
   "scripts/build_package_api.mjs": null,
   "scripts/census_attributes.mjs": null,
   "scripts/check_a11y.mjs": null,
@@ -413,6 +415,7 @@ const REFUSALS = {
   "scripts/try_help_addin.mjs": ["ide"],
   "scripts/bug_repro.mjs": ["ide"],
   "scripts/build_dot_metrics.mjs": [null],
+  "scripts/build_help_archive.mjs": ["src"],
   "scripts/build_package_api.mjs": ["out"],
   "scripts/census_attributes.mjs": ["out"],
   "scripts/check_a11y.mjs": ["root-dir"],
diff --git a/test/addin/help.test.mjs b/test/addin/help.test.mjs
index 19753344c..ebab7ae77 100644
--- a/test/addin/help.test.mjs
+++ b/test/addin/help.test.mjs
@@ -5,16 +5,21 @@
 // declared.
 //
 // The add-in is built as committed, with its copy of the symbol index,
-// add-in/Resources/SYMBOLS/symbols.json, embedded as a resource. The pane's
-// frame loads the built site, docs/_site, which this file serves on localhost
-// and gives the add-in as TB_DOCS_HELP_SITE: so every page a case reaches is a
-// page of the build, and nothing comes from the network. Run build.bat first.
+// add-in/Resources/SYMBOLS/symbols.json, embedded as a resource. This file
+// serves the built site, docs/_site, on localhost and gives the add-in it as
+// TB_DOCS_HELP_SITE, which Open in browser opens. The lane named help builds
+// the add-in without the help archive, so the pane's frame loads that site
+// too; the lane named help-offline builds it with an archive of the built
+// offline tree (scripts/build_help_archive.mjs), so the frame loads the
+// add-in's own server. Either way every page a case reaches is a page of the
+// build, and nothing comes from the network. Run build.bat first.
 // Each case is a line and column in helphost/Sources/Cases.twin, so a change to
 // that file is a change to this table.
 //
 // Run it with addin-test.bat, which gives it a lane; on its own it is skipped.
 
 import assert from "node:assert/strict";
+import { spawnSync } from "node:child_process";
 import fs from "node:fs";
 import path from "node:path";
 import { before, test } from "node:test";
@@ -44,6 +49,11 @@ const ROOT = path.resolve(HERE, "..", "..");
 const ADDIN = path.join(ROOT, "add-in");
 const INDEX = path.join(ADDIN, "Resources", "SYMBOLS", "symbols.json");
 const BUILT = path.join(ROOT, "docs", "_site");
+const BUILT_OFFLINE = path.join(ROOT, "docs", "_site-offline");
+const ARCHIVE_TOOL = path.join(ROOT, "scripts", "build_help_archive.mjs");
+// "serving site.zip, <n> files, at <origin>", which the add-in prints when it
+// has the archive.
+const SERVING = /^serving site\.zip, \d+ files, at (http:\/\/localhost:\d+)$/;
 const HOST = path.join(HERE, "helphost");
 const FILE = "/HelpHost/Sources/Cases.twin";
 const PANE = "tbDocsHelpPane";
@@ -114,9 +124,10 @@ async function emptySearch(c) {
 scenario("the help add-in: F1 and the help pane", (lane) => {
   let c;
   let entries;
-  let origin;
+  let origin; // the site this file serves
+  let pages; // where the frame's pages come from: origin, or the add-in's server
   let server;
-  const served = []; // { path, status } for every request the site answered
+  const offline = lane.name === "help-offline";
 
   // The frame shows `url` from the built site in the IDE's theme: the add-in
   // gave it that src with ?theme= and ?pane=1, the page it loaded is the
@@ -126,7 +137,7 @@ scenario("the help add-in: F1 and the help pane", (lane) => {
   async function showsPage(url, { fresh = false } = {}) {
     const group = await themeGroup(c);
     const [pagePath, fragment] = url.split("#");
-    const want = `${origin}${pagePath}?theme=${group}&pane=1${fragment ? `#${fragment}` : ""}`;
+    const want = `${pages}${pagePath}?theme=${group}&pane=1${fragment ? `#${fragment}` : ""}`;
     // The frame can have this src already, hidden behind a summary, so the
     // page showing again is waited for too.
     const shown = { summary: "none", frame: "", browserDisabled: false };
@@ -138,20 +149,26 @@ scenario("the help add-in: F1 and the help pane", (lane) => {
     assert.ok((await toolWindow(c, PANE))?.visible, "the pane is not showing");
     assert.deepEqual(await pageState(c), shown);
     const loaded = await waitFor(c, async (c) => {
-      const f = await frameOf(c, origin);
-      const loadedUrl = `${origin}${pagePath.replace(/\/$/, "")}?theme=${group}&pane=1`;
+      const f = await frameOf(c, pages);
+      const loadedUrl = `${pages}${pagePath.replace(/\/$/, "")}?theme=${group}&pane=1`;
       if (!f || f.url.replace(/\/\?/, "?") !== loadedUrl) return false;
       // A src set to the URL the frame already has reloads it, and a question
       // put to the page being replaced fails: that is not loaded yet.
       const ready = `document.readyState === "complete"${fresh ? " && !window.tbDocsTestMark" : ""}`;
-      return (await frameEval(c, origin, ready).catch(() => false)) === true;
+      return (await frameEval(c, pages, ready).catch(() => false)) === true;
     });
-    assert.ok(loaded, `the frame did not load ${want}: ${JSON.stringify(await frameOf(c, origin))}`);
-    if (fragment) assert.equal((await frameOf(c, origin)).urlFragment, `#${fragment}`);
-    const page = served.filter((r) => r.path.replace(/\/$/, "") === pagePath.replace(/\/$/, "")).at(-1);
-    assert.equal(page?.status, 200, `${url} as served: ${JSON.stringify(page)}`);
+    if (!loaded) {
+      const frames = (await c.send("Page.getFrameTree")).frameTree.childFrames ?? [];
+      assert.fail(
+        `the frame did not load ${want}; the page's frames: ${JSON.stringify(frames.map((f) => f.frame.url))}`,
+      );
+    }
+    if (fragment) assert.equal((await frameOf(c, pages)).urlFragment, `#${fragment}`);
+    // The status the page itself came with, after any redirect to its folder.
+    const status = await frameEval(c, pages, `performance.getEntriesByType("navigation")[0]?.responseStatus`);
+    assert.equal(status, 200, `${url} as served`);
     assert.equal(
-      await frameEval(c, origin, `document.documentElement.getAttribute("data-theme")`),
+      await frameEval(c, pages, `document.documentElement.getAttribute("data-theme")`),
       group,
       "the page's theme",
     );
@@ -164,7 +181,7 @@ scenario("the help add-in: F1 and the help pane", (lane) => {
   const paneChrome = () =>
     frameEval(
       c,
-      origin,
+      pages,
       `(() => {
         const shown = (s) => { const e = document.querySelector(s); return e ? getComputedStyle(e).display : "missing"; };
         return { sidebar: shown(".side-bar"), header: shown(".main-header"), breadcrumbs: shown(".breadcrumb-nav"), footer: shown("footer[role=contentinfo]") };
@@ -174,7 +191,23 @@ scenario("the help add-in: F1 and the help pane", (lane) => {
   // Marks the page the frame shows now, so that showsPage can tell a page F1
   // loaded from it: F1 on the name whose page shows already loads it again,
   // and the page before the reload looks loaded until the reload begins.
-  const markFrame = () => frameEval(c, origin, "window.tbDocsTestMark = true").catch(() => {});
+  const markFrame = () => frameEval(c, pages, "window.tbDocsTestMark = true").catch(() => {});
+
+  // The frame's origin once the add-in has loaded after `mark`: the add-in's
+  // server, whose port changes with every start, or the site this file serves.
+  async function pagesOrigin(mark) {
+    const loaded = await waitFor(c, async (c) => (await addinLines(c, mark)).some((l) => l.startsWith("loaded")));
+    assert.ok(loaded, "the add-in never printed its loaded line");
+    const serving = (await addinLines(c, mark)).filter((l) => l.startsWith("serving") || l.startsWith("not serving"));
+    if (!offline) {
+      assert.deepEqual(serving, [], "the add-in built without the archive serves it");
+      return origin;
+    }
+    assert.equal(serving.length, 1, `the add-in's lines about the archive: ${JSON.stringify(serving)}`);
+    const m = serving[0].match(SERVING);
+    assert.ok(m, `the add-in does not serve the archive: ${serving[0]}`);
+    return m[1];
+  }
 
   // Press F1 at line:column, and expect `want` in place of the page, the frame
   // hidden, Open in browser disabled, and nothing printed.
@@ -203,14 +236,23 @@ scenario("the help add-in: F1 and the help pane", (lane) => {
   before(async () => {
     assert.ok(fs.existsSync(path.join(BUILT, "tB", "symbols.json")), `no built site in ${BUILT}: run build.bat`);
     entries = JSON.parse(fs.readFileSync(INDEX, "utf8")).symbols.length;
-    const files = createStaticHandler(BUILT);
-    server = await serveLoopback((req, res) => {
-      res.on("finish", () => served.push({ path: req.url.split(/[?#]/)[0], status: res.statusCode }));
-      return files(req, res);
-    });
+    server = await serveLoopback(createStaticHandler(BUILT));
     origin = `http://localhost:${server.port}`;
-    await lane.addAddin(ADDIN);
+    // The add-in as committed, with the archive only in the offline lane,
+    // whatever add-in/Resources/HELP holds in this working tree.
+    const src = path.join(lane.work, "help-src");
+    fs.rmSync(src, { recursive: true, force: true });
+    const skip = [path.join(ADDIN, "Build"), path.join(ADDIN, "Resources", "HELP")];
+    fs.cpSync(ADDIN, src, { recursive: true, filter: (f) => !skip.includes(f) });
+    if (offline) {
+      const r = spawnSync(process.execPath, [ARCHIVE_TOOL, "--out", path.join(src, "Resources", "HELP", "site.zip")], {
+        encoding: "utf8",
+      });
+      assert.equal(r.status, 0, `build_help_archive failed:\n${r.stdout}${r.stderr}`);
+    }
+    await lane.addAddin(src);
     c = await lane.open(HOST, { env: { TB_DOCS_HELP_SITE: origin } });
+    pages = await pagesOrigin(null);
     await openFile(c, FILE, { line: 5, column: 9 });
   });
 
@@ -226,6 +268,39 @@ scenario("the help add-in: F1 and the help pane", (lane) => {
     assert.equal(await frameSrc(c), null, "a page in the frame before any was asked for");
   });
 
+  // Asked from here, not from the pane: the server finds a path as GitHub
+  // Pages does, and sends each file as the offline tree has it.
+  test("the add-in's server answers as GitHub Pages does", { skip: !offline && "the help lane" }, async () => {
+    const get = (p, o = {}) => fetch(`${pages}${p}`, { redirect: "manual", signal: AbortSignal.timeout(10000), ...o });
+    const tree = (rel) => fs.readFileSync(path.join(BUILT_OFFLINE, rel));
+
+    let r = await get("/tB/Modules/Interaction/MsgBox?theme=dark&pane=1");
+    assert.equal(r.status, 200);
+    assert.equal(r.headers.get("content-type"), "text/html; charset=utf-8");
+    assert.equal(r.headers.get("content-encoding"), "gzip");
+    assert.ok(Buffer.from(await r.arrayBuffer()).equals(tree("tB/Modules/Interaction/MsgBox.html")));
+
+    r = await get("/Documentation/Images/af-vector-studio.png");
+    assert.equal(r.status, 200);
+    assert.equal(r.headers.get("content-type"), "image/png");
+    assert.equal(r.headers.get("content-encoding"), null);
+    assert.ok(Buffer.from(await r.arrayBuffer()).equals(tree("Documentation/Images/af-vector-studio.png")));
+
+    r = await get("/Features/Advanced?pane=1");
+    assert.equal(r.status, 301);
+    assert.equal(r.headers.get("location"), "/Features/Advanced/?pane=1");
+    await r.body?.cancel();
+    r = await get("/Features/Advanced/");
+    assert.ok(Buffer.from(await r.arrayBuffer()).equals(tree("Features/Advanced/index.html")));
+
+    r = await get("/no/such/page");
+    assert.equal(r.status, 404);
+    await r.body?.cancel();
+    r = await get("/tB/Modules/Interaction/MsgBox", { method: "HEAD" });
+    assert.equal(r.status, 200);
+    assert.ok(Number(r.headers.get("content-length")) > 0);
+  });
+
   // [line, column, URL] in Cases.twin; the comment says what the cursor is on.
   // The compiler's hover says where most of these are declared; the ones it
   // says nothing about (Debug.Print, a statement, a comment) take the index's
@@ -419,14 +494,14 @@ scenario("the help add-in: F1 and the help pane", (lane) => {
     await inPane(c, `root.querySelector("#helpPage").dataset.beforeRestart = "1";`);
     const mark = await consoleMark(c);
     await lane.restartCompiler();
-    assert.ok(await waitFor(c, async (c) => (await addinLines(c, mark)).some((l) => l.startsWith("loaded"))));
+    pages = await pagesOrigin(mark);
     const src = await waitFor(c, (c) =>
       inPane(
         c,
         `const f = root.querySelector("#helpPage"); return f && !f.dataset.beforeRestart && f.getAttribute("src");`,
       ),
     );
-    assert.equal(src, `${origin}/tB/Modules/Interaction/MsgBox?theme=${await themeGroup(c)}&pane=1`);
+    assert.equal(src, `${pages}/tB/Modules/Interaction/MsgBox?theme=${await themeGroup(c)}&pane=1`);
   });
 
   // A page reached from the pane's page has no parameters of its own; the site
@@ -434,15 +509,15 @@ scenario("the help add-in: F1 and the help pane", (lane) => {
   test("a page reached by a link keeps the IDE's theme and the pane's layout", async () => {
     await f1Shows("/tB/Modules/Interaction/MsgBox", () => at(c, 5, 9).then(() => pressKey(c, "F1")));
     const next = "/tB/Modules/Strings/Len";
-    await frameEval(c, origin, `location.href = ${JSON.stringify(next)}`);
+    await frameEval(c, pages, `location.href = ${JSON.stringify(next)}`);
     const loaded = await waitFor(c, async (c) => {
-      const f = await frameOf(c, origin);
-      if (f?.url !== `${origin}${next}`) return false;
-      return (await frameEval(c, origin, `document.readyState === "complete"`).catch(() => false)) === true;
+      const f = await frameOf(c, pages);
+      if (f?.url !== `${pages}${next}`) return false;
+      return (await frameEval(c, pages, `document.readyState === "complete"`).catch(() => false)) === true;
     });
-    assert.ok(loaded, `the frame did not load ${next}: ${JSON.stringify(await frameOf(c, origin))}`);
+    assert.ok(loaded, `the frame did not load ${next}: ${JSON.stringify(await frameOf(c, pages))}`);
     assert.equal(
-      await frameEval(c, origin, `document.documentElement.getAttribute("data-theme")`),
+      await frameEval(c, pages, `document.documentElement.getAttribute("data-theme")`),
       await themeGroup(c),
       "the page's theme",
     );
diff --git a/test/addin/lanes.mjs b/test/addin/lanes.mjs
index 45b3a8c5f..1ec03b6a0 100644
--- a/test/addin/lanes.mjs
+++ b/test/addin/lanes.mjs
@@ -34,6 +34,8 @@ export default [
   { file: "entry.test.mjs" },
   { file: "env.test.mjs" },
   // The help add-in, add-in/ at the repository's root. It saves the page its
-  // pane shows.
+  // pane shows. The second lane builds it with the help archive, so its pane's
+  // pages come from the add-in's own server.
   { file: "help.test.mjs", settings: ["tbDocsHelp"] },
+  { file: "help.test.mjs", name: "help-offline", settings: ["tbDocsHelp"] },
 ];

From 5227956c2bde8a596fba56ba49ecb8e498c96cd0 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 17:30:03 +0200
Subject: [PATCH 07/42] BETA 997 fixed 14 filed bugs: verified, their
 reproducers removed, and the pages state the correct behaviour with no
 mention of the defect; #2465 closed as not a bug; a fixed defect's callout
 now goes rather than becoming a NOTE

---
 BUGS-TO-REPORT.md                             |  16 +-
 WIP.ExamplesBuild.md                          |  10 +-
 WIP.Harness.md                                |   7 +-
 WIP.HelpAddin.md                              |   7 +-
 WIP.md                                        |   2 +-
 bugs/filed/asnew-optional-ctor/REPORT.md      |  40 ----
 .../asnew-optional-ctor.twinproj              | Bin 2540 -> 0 bytes
 bugs/filed/asnew-optional-ctor/repro.json     |   9 -
 bugs/filed/asnew-optional-ctor/src/Settings   |  61 -----
 .../src/Sources/Probe.twin                    |  14 --
 .../src/Sources/Startup.twin                  |   6 -
 .../circle-positive-angle-unchecked/REPORT.md |  41 ----
 .../circle-positive-angle-unchecked.twinproj  | Bin 15128 -> 0 bytes
 .../images/main-compare.png                   | Bin 2634 -> 0 bytes
 .../images/main-tb.png                        | Bin 878 -> 0 bytes
 .../images/main-vb6.png                       | Bin 678 -> 0 bytes
 .../images/tb-beta.txt                        |   1 -
 .../repro.json                                |  14 --
 .../src/Settings                              |  61 -----
 .../src/Sources/Form1.tbform                  |  95 --------
 .../src/Sources/Form1.twin                    |   9 -
 .../src/Sources/PngDump.twin                  | 201 ----------------
 .../src/Sources/Startup.twin                  |  25 --
 .../vb6/Form1.frm                             |  19 --
 .../vb6/Module1.bas                           |  34 ---
 .../vb6/PngDump.bas                           | 200 ----------------
 .../vb6/Probe.vbp                             |   9 -
 .../crash-placeholder-interface/REPORT.md     |  37 ---
 .../crash-placeholder-interface.twinproj      | Bin 2403 -> 0 bytes
 .../crash-placeholder-interface/repro.json    |   7 -
 .../crash-placeholder-interface/src/Settings  |  61 -----
 .../src/Sources/Placeholder.twin              |   3 -
 .../src/Sources/Startup.twin                  |   6 -
 .../enum-connection-points-contract/REPORT.md |  44 ----
 .../enum-connection-points-contract.twinproj  | Bin 3782 -> 0 bytes
 .../repro.json                                |  13 --
 .../src/Settings                              |  61 -----
 .../src/Sources/Startup.twin                  |  48 ----
 .../vb6/Holder.cls                            |  20 --
 .../vb6/Probe.vbp                             |   9 -
 .../vb6/ProbeMain.bas                         | 218 ------------------
 .../vb6/Source.cls                            |  13 --
 .../filed/enum-connections-one-item/REPORT.md |  34 ---
 .../enum-connections-one-item.twinproj        | Bin 4466 -> 0 bytes
 .../enum-connections-one-item/repro.json      |  10 -
 .../enum-connections-one-item/src/Settings    |  61 -----
 .../src/Sources/Startup.twin                  |  69 ------
 .../enum-connections-one-item/vb6/Holder.cls  |  20 --
 .../enum-connections-one-item/vb6/Probe.vbp   |   9 -
 .../vb6/ProbeMain.bas                         | 218 ------------------
 .../enum-connections-one-item/vb6/Source.cls  |  13 --
 .../enum-member-description-hover/REPORT.md   |  51 ----
 .../enum-member-description-hover.twinproj    | Bin 2520 -> 0 bytes
 .../enum-member-description-hover/repro.json  |   5 -
 .../src/Settings                              |  61 -----
 .../src/Sources/Startup.twin                  |  17 --
 bugs/filed/export-follows-junction/REPORT.md  |  38 ---
 .../export-follows-junction.twinproj          | Bin 2321 -> 0 bytes
 bugs/filed/export-follows-junction/repro.json |   5 -
 .../export-follows-junction/src/Settings      |  63 -----
 .../src/Sources/Startup.twin                  |   5 -
 bugs/filed/f1-fold-signature-help/REPORT.md   |  28 ---
 .../f1-fold-signature-help.twinproj           | Bin 2576 -> 0 bytes
 bugs/filed/f1-fold-signature-help/repro.json  |   5 -
 .../filed/f1-fold-signature-help/src/Settings |  61 -----
 .../src/Sources/Haystack.twin                 |   8 -
 .../src/Sources/Main.twin                     |   8 -
 bugs/filed/filecopy-open-file/REPORT.md       |  30 ---
 .../filecopy-open-file.twinproj               | Bin 2966 -> 0 bytes
 bugs/filed/filecopy-open-file/repro.json      |  12 -
 bugs/filed/filecopy-open-file/src/Settings    |  61 -----
 .../src/Sources/Startup.twin                  |  30 ---
 bugs/filed/forms-by-index-crash/REPORT.md     |  37 ---
 .../forms-by-index-crash.twinproj             | Bin 4916 -> 0 bytes
 bugs/filed/forms-by-index-crash/repro.json    |   8 -
 bugs/filed/forms-by-index-crash/src/Settings  |  61 -----
 .../src/Sources/Form1.tbform                  |  83 -------
 .../src/Sources/Form1.twin                    |  10 -
 .../src/Sources/Startup.twin                  |  17 --
 .../hover-byval-option-explicit/REPORT.md     |  48 ----
 .../hover-byval-option-explicit.twinproj      | Bin 2037 -> 0 bytes
 .../hover-byval-option-explicit/repro.json    |   5 -
 .../hover-byval-option-explicit/src/Settings  |  42 ----
 .../src/Sources/Symbols.twin                  |   8 -
 bugs/filed/index-error-numbers/REPORT.md      |  36 ---
 .../index-error-numbers.twinproj              | Bin 3207 -> 0 bytes
 bugs/filed/index-error-numbers/repro.json     |  12 -
 bugs/filed/index-error-numbers/src/Settings   |  61 -----
 .../src/Sources/Startup.twin                  |  38 ---
 .../lset-variant-array-element-noop/REPORT.md |   2 +-
 bugs/filed/populatefrom-no-args/REPORT.md     |  39 ----
 .../populatefrom-no-args.twinproj             | Bin 2336 -> 0 bytes
 bugs/filed/populatefrom-no-args/repro.json    |   7 -
 bugs/filed/populatefrom-no-args/src/Settings  |  61 -----
 .../src/Sources/Probe.twin                    |   6 -
 .../src/Sources/Startup.twin                  |   6 -
 .../proper-case-even-separators/REPORT.md     |  31 ---
 .../proper-case-even-separators.twinproj      | Bin 2502 -> 0 bytes
 .../proper-case-even-separators/repro.json    |  13 --
 .../proper-case-even-separators/src/Settings  |  61 -----
 .../src/Sources/Startup.twin                  |  10 -
 .../vb6/Module1.bas                           |  17 --
 .../proper-case-even-separators/vb6/Probe.vbp |   7 -
 .../filed/wv2-headers-foreach-crash/REPORT.md |  36 ---
 .../wv2-headers-foreach-crash/repro.json      |  14 --
 .../wv2-headers-foreach-crash/src/Settings    |  75 ------
 .../src/Sources/Form1.tbform                  | 146 ------------
 .../src/Sources/Form1.twin                    |  32 ---
 .../src/Sources/Startup.twin                  |   8 -
 .../wv2-headers-foreach-crash.twinproj        | Bin 7974 -> 0 bytes
 docs/Documentation/Authoring.md               |   2 +-
 docs/Features/Advanced/Classes-and-Modules.md |   2 +-
 docs/Features/Language/Inheritance.md         |   2 +-
 docs/IDE/Menu/Debug.md                        |   6 +-
 docs/IDE/Menu/File.md                         |   2 +-
 docs/Reference/Attributes.md                  |   2 +-
 .../Built-In/WebView2/WebView2Header.md       |   3 -
 .../WebView2/WebView2HeadersCollection.md     |   3 -
 .../WebView2/WebView2RequestHeaders.md        |   3 -
 .../WebView2/WebView2ResponseHeaders.md       |   3 -
 .../COM-Interfaces/IConnectionPoint.md        |  18 +-
 docs/Reference/Core/Graphics-Methods.md       |   5 +-
 docs/Reference/Core/New.md                    |   2 +-
 docs/Reference/Core/On-Error.md               |   3 -
 docs/Reference/Default/VB/Form/index.md       |   5 +-
 docs/Reference/Default/VB/Global/index.md     |   5 +-
 docs/Reference/Default/VB/PictureBox/index.md |   5 +-
 docs/Reference/Default/VB/Printer/index.md    |   5 +-
 docs/Reference/Default/VB/Printers/index.md   |   6 +-
 .../Default/VB/PropertyPage/index.md          |   5 +-
 docs/Reference/Default/VB/Report/index.md     |   5 +-
 .../Reference/Default/VB/UserControl/index.md |   5 +-
 docs/Reference/Default/VBA/Collection/Item.md |   5 +-
 .../Reference/Default/VBA/ErrObject/Number.md |  16 --
 .../Default/VBA/FileSystem/FileCopy.md        |   5 +-
 .../Reference/Default/VBA/FileSystem/index.md |   2 +-
 docs/Reference/Default/VBA/Strings/StrConv.md |   5 +-
 .../Default/VBRUN/ErrorContext/index.md       |   3 -
 test/addin/keys.test.mjs                      |  12 +-
 test/addin/symbols.test.mjs                   |  19 +-
 test/ide/debugger.test.mjs                    |  12 +
 test/ide/export.test.mjs                      |   9 +-
 test/png.test.mjs                             |   6 +-
 143 files changed, 89 insertions(+), 3482 deletions(-)
 delete mode 100644 bugs/filed/asnew-optional-ctor/REPORT.md
 delete mode 100644 bugs/filed/asnew-optional-ctor/asnew-optional-ctor.twinproj
 delete mode 100644 bugs/filed/asnew-optional-ctor/repro.json
 delete mode 100644 bugs/filed/asnew-optional-ctor/src/Settings
 delete mode 100644 bugs/filed/asnew-optional-ctor/src/Sources/Probe.twin
 delete mode 100644 bugs/filed/asnew-optional-ctor/src/Sources/Startup.twin
 delete mode 100644 bugs/filed/circle-positive-angle-unchecked/REPORT.md
 delete mode 100644 bugs/filed/circle-positive-angle-unchecked/circle-positive-angle-unchecked.twinproj
 delete mode 100644 bugs/filed/circle-positive-angle-unchecked/images/main-compare.png
 delete mode 100644 bugs/filed/circle-positive-angle-unchecked/images/main-tb.png
 delete mode 100644 bugs/filed/circle-positive-angle-unchecked/images/main-vb6.png
 delete mode 100644 bugs/filed/circle-positive-angle-unchecked/images/tb-beta.txt
 delete mode 100644 bugs/filed/circle-positive-angle-unchecked/repro.json
 delete mode 100644 bugs/filed/circle-positive-angle-unchecked/src/Settings
 delete mode 100644 bugs/filed/circle-positive-angle-unchecked/src/Sources/Form1.tbform
 delete mode 100644 bugs/filed/circle-positive-angle-unchecked/src/Sources/Form1.twin
 delete mode 100644 bugs/filed/circle-positive-angle-unchecked/src/Sources/PngDump.twin
 delete mode 100644 bugs/filed/circle-positive-angle-unchecked/src/Sources/Startup.twin
 delete mode 100644 bugs/filed/circle-positive-angle-unchecked/vb6/Form1.frm
 delete mode 100644 bugs/filed/circle-positive-angle-unchecked/vb6/Module1.bas
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 delete mode 100644 bugs/filed/crash-placeholder-interface/REPORT.md
 delete mode 100644 bugs/filed/crash-placeholder-interface/crash-placeholder-interface.twinproj
 delete mode 100644 bugs/filed/crash-placeholder-interface/repro.json
 delete mode 100644 bugs/filed/crash-placeholder-interface/src/Settings
 delete mode 100644 bugs/filed/crash-placeholder-interface/src/Sources/Placeholder.twin
 delete mode 100644 bugs/filed/crash-placeholder-interface/src/Sources/Startup.twin
 delete mode 100644 bugs/filed/enum-connection-points-contract/REPORT.md
 delete mode 100644 bugs/filed/enum-connection-points-contract/enum-connection-points-contract.twinproj
 delete mode 100644 bugs/filed/enum-connection-points-contract/repro.json
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 delete mode 100644 bugs/filed/enum-connection-points-contract/src/Sources/Startup.twin
 delete mode 100644 bugs/filed/enum-connection-points-contract/vb6/Holder.cls
 delete mode 100644 bugs/filed/enum-connection-points-contract/vb6/Probe.vbp
 delete mode 100644 bugs/filed/enum-connection-points-contract/vb6/ProbeMain.bas
 delete mode 100644 bugs/filed/enum-connection-points-contract/vb6/Source.cls
 delete mode 100644 bugs/filed/enum-connections-one-item/REPORT.md
 delete mode 100644 bugs/filed/enum-connections-one-item/enum-connections-one-item.twinproj
 delete mode 100644 bugs/filed/enum-connections-one-item/repro.json
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 delete mode 100644 bugs/filed/enum-connections-one-item/src/Sources/Startup.twin
 delete mode 100644 bugs/filed/enum-connections-one-item/vb6/Holder.cls
 delete mode 100644 bugs/filed/enum-connections-one-item/vb6/Probe.vbp
 delete mode 100644 bugs/filed/enum-connections-one-item/vb6/ProbeMain.bas
 delete mode 100644 bugs/filed/enum-connections-one-item/vb6/Source.cls
 delete mode 100644 bugs/filed/enum-member-description-hover/REPORT.md
 delete mode 100644 bugs/filed/enum-member-description-hover/enum-member-description-hover.twinproj
 delete mode 100644 bugs/filed/enum-member-description-hover/repro.json
 delete mode 100644 bugs/filed/enum-member-description-hover/src/Settings
 delete mode 100644 bugs/filed/enum-member-description-hover/src/Sources/Startup.twin
 delete mode 100644 bugs/filed/export-follows-junction/REPORT.md
 delete mode 100644 bugs/filed/export-follows-junction/export-follows-junction.twinproj
 delete mode 100644 bugs/filed/export-follows-junction/repro.json
 delete mode 100644 bugs/filed/export-follows-junction/src/Settings
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diff --git a/BUGS-TO-REPORT.md b/BUGS-TO-REPORT.md
index 1be9c9b2f..2f770f074 100644
--- a/BUGS-TO-REPORT.md
+++ b/BUGS-TO-REPORT.md
@@ -867,7 +867,7 @@ What was tried:
 - An interface with three `[PreserveSig]` members declared in `IUnknown`'s order, `QueryInterface`, `AddRef` and `Release`, behaves the same way: `Set` succeeds, and the calls go to the wrong slots (one `AddRef` returned 0, and the next call crashed).
 - `Interface IUnk Extends stdole.IUnknown` with that identifier compiles, and `u.AddRef` is then reported as `TB5027 Unrecognized member 'AddRef' on type 'IUnk'`, as it is for `stdole.IUnknown` itself, which has no members that twinBASIC code can call.
 
-<!-- Reproducer: bugs/iunknown-iid-interface/ (mode run, expects tbrun exit 5, the output `ok` and the native exception); verified on 995. Stated in docs/Reference/COM-Interfaces/IUnknown.md, section "Implementing it" (the WARNING, which names BETA 995, after the paragraph that begins "A project's own Interface that carries the identifier of IUnknown also compiles"): when fixed, replace it with a NOTE saying since which build and what the compiler now does (a diagnostic, or a working call). -->
+<!-- Reproducer: bugs/iunknown-iid-interface/ (mode run, expects tbrun exit 5, the output `ok` and the native exception); verified on 995. Stated in docs/Reference/COM-Interfaces/IUnknown.md, section "Implementing it" (the WARNING, which names BETA 995, after the paragraph that begins "A project's own Interface that carries the identifier of IUnknown also compiles"): when fixed, remove it and state what the compiler does (a diagnostic, or a working call). -->
 
 ---
 
@@ -1085,7 +1085,7 @@ Severity: low for a program that passes all the arguments; for one that does not
 
 Related and also different from VB6: `Err.Raise 65536` is accepted, and `Err.Number` is 65536, where VB6 raises error 5. `Err.Raise 0` raises error 5 in both. An explicit empty string for the source or the description gives an empty `Source` or `Description`, in VB6 as well. `Err.HelpContext` is 0 in twinBASIC, and VB6 sets it to 1000000 plus the number for a `Raise` without one (`1000005` for 5).
 
-<!-- Reproducer: bugs/err-raise-defaults/ (mode run, expects the five lines above in twinBASIC); verified on 995. VB6 side from the same program, in bugs/err-raise-defaults/vb6/; the full sweep and the per-number lists are in s71/raise/ (out-tb-995.txt, out-vb6.txt, analyze.mjs), local scratch files that are not in the repository. Stated in docs/Reference/Default/VBA/ErrObject/Raise.md (the table under *description* and the WARNING after it, which names BETA 995, plus the check_run sample), in Source.md (the WARNING) and in Description.md (the WARNING); docs/Reference/COM-Interfaces/IErrorInfo.md says GetSource returns an empty string and GetDescription the standard text when Raise gets neither. When fixed, replace those WARNINGs with NOTEs saying since which build, delete the table, restore the sentences about the project's programmatic ID, the generic message and the carried-over values, and rewrite the sample's expected output. docs/Reference/Default/VBRUN/ErrorContext/index.md says Source is the project name for errors raised inside a project; that is not what Err.Source holds and should be checked when this is fixed. -->
+<!-- Reproducer: bugs/err-raise-defaults/ (mode run, expects the five lines above in twinBASIC); verified on 995. VB6 side from the same program, in bugs/err-raise-defaults/vb6/; the full sweep and the per-number lists are in s71/raise/ (out-tb-995.txt, out-vb6.txt, analyze.mjs), local scratch files that are not in the repository. Stated in docs/Reference/Default/VBA/ErrObject/Raise.md (the table under *description* and the WARNING after it, which names BETA 995, plus the check_run sample), in Source.md (the WARNING) and in Description.md (the WARNING); docs/Reference/COM-Interfaces/IErrorInfo.md says GetSource returns an empty string and GetDescription the standard text when Raise gets neither. When fixed, remove those WARNINGs, delete the table, restore the sentences about the project's programmatic ID, the generic message and the carried-over values, and rewrite the sample's expected output. docs/Reference/Default/VBRUN/ErrorContext/index.md says Source is the project name for errors raised inside a project; that is not what Err.Source holds and should be checked when this is fixed. -->
 
 ---
 
@@ -1122,7 +1122,7 @@ The two symptoms are one bug because the object is the same: `ObjPtr` of what `G
 What does not reproduce it: a fresh thread (`GetErrorInfo` returns `S_FALSE`); a caller that makes the call through an interface whose methods are declared `[PreserveSig]` and reads the slot itself, where the first `GetErrorInfo` returns the values and the second returns `S_FALSE`; the second `GetErrorInfo` after the object has been read from the slot (it returns `S_FALSE`, so `GetErrorInfo` does empty the slot).
 Severity: low. The slot is not a documented twinBASIC interface, but a program that reads error information with the COM functions, or a library that does, sees values that change under it, and a program cannot rely on the description of a failure that came with no error information.
 
-<!-- Reproducer: bugs/err-info-live-view/ (mode run, expects the lines above); verified on 995. The VB6 slot results (empty after Err.Raise 5 in the procedure, after a raise in a class method handled by the caller, and after a class method that handled its own error) are from bugs/err-info-live-view/vb6/; the full set of probes (T1 to T10, with ObjPtr) is in s71/liveview/, a local scratch folder that is not in the repository. Stated in docs/Reference/COM-Interfaces/IErrorInfo.md, in two WARNINGs that name BETA 995: the one after "**GetErrorInfo** empties the slot" in *A method that raises an error*, and the one that begins "the slot is not always empty" under *A failure with no error information*. When fixed, replace each with a NOTE saying since which build, or delete it; the table of Automation error and the `emptySlot` samples need no change except the sentence about a stale object. -->
+<!-- Reproducer: bugs/err-info-live-view/ (mode run, expects the lines above); verified on 995. The VB6 slot results (empty after Err.Raise 5 in the procedure, after a raise in a class method handled by the caller, and after a class method that handled its own error) are from bugs/err-info-live-view/vb6/; the full set of probes (T1 to T10, with ObjPtr) is in s71/liveview/, a local scratch folder that is not in the repository. Stated in docs/Reference/COM-Interfaces/IErrorInfo.md, in two WARNINGs that name BETA 995: the one after "**GetErrorInfo** empties the slot" in *A method that raises an error*, and the one that begins "the slot is not always empty" under *A failure with no error information*. When fixed, remove each; the table of Automation error and the `emptySlot` samples need no change except the sentence about a stale object. -->
 
 ---
 
@@ -1167,7 +1167,7 @@ What was tried: an object that is not a sink gives an ordinary error (`E_NOINTER
 
 VB6 crashes too. The same call on the connection point of a VB6 class with an event, made through `DispCallFunc` (the VB6 project is attached as `advise-nothing-crashes-vb6.zip`), ends the exe with an access violation (`0xC0000005` in `MSVBVM60.DLL`, in the Application event log) after it writes `before`. A fix therefore costs no compatibility: no program depends on the crash.
 
-<!-- Reproducer: bugs/advise-nothing-crashes/ (mode run, expects tbrun exit 5, the output `before` and the native exception); verified on 995. VB6 side in bugs/advise-nothing-crashes/vb6/ (VB6 6.0): out.txt ends at `before`, and `vb6` reports the crash. Stated in docs/Reference/COM-Interfaces/IConnectionPoint.md, section Advise, the last bullet of "In twinBASIC" and the WARNING after it, which names BETA 995 ("Advise with Nothing as the sink ends the program with an access violation"): when fixed, replace the WARNING with a NOTE saying since which build and what error it raises, and add Nothing to the example if it fits. -->
+<!-- Reproducer: bugs/advise-nothing-crashes/ (mode run, expects tbrun exit 5, the output `before` and the native exception); verified on 995. VB6 side in bugs/advise-nothing-crashes/vb6/ (VB6 6.0): out.txt ends at `before`, and `vb6` reports the crash. Stated in docs/Reference/COM-Interfaces/IConnectionPoint.md, section Advise, the last bullet of "In twinBASIC" and the WARNING after it, which names BETA 995 ("Advise with Nothing as the sink ends the program with an access violation"): when fixed, remove the WARNING, state what error it raises, and add Nothing to the example if it fits. -->
 
 ---
 
@@ -1212,7 +1212,7 @@ before Unadvise 0
 Severity: low. A client that releases a connection twice, or with a wrong cookie, is told it worked.
 
 `Advise` with a sink that does not answer `QueryInterface` for the outgoing interface fails with `E_NOINTERFACE` (`&H80004002`), where the Windows SDK page for [IConnectionPoint::Advise](https://learn.microsoft.com/en-us/windows/win32/api/ocidl/nf-ocidl-iconnectionpoint-advise) says the method "must return CONNECT_E_CANNOTCONNECT" (`&H80040201`). VB6 returns `E_NOINTERFACE` too, so that is not reported here; the reproducer prints it as a control. A sink that is an ordinary twinBASIC class gives the same `E_NOINTERFACE` whether it has no members or implements `IDispatch` (the outgoing interface's identifier is generated for each build, so a twinBASIC class cannot answer for it). Nothing is connected afterwards, and no event reaches the sink. Calling `Unadvise` a second time with the cookie of the failed `Advise`, which is 0, also returns without an error.
-<!-- Reproducer: bugs/advise-unadvise-hresults/ (mode run, expects tbrun exit 0 and the three lines above); verified on 995. VB6 side in bugs/advise-unadvise-hresults/vb6/ (VB6 6.0), the output above; it ends at `before Unadvise 0` because that call crashes the exe. Narrowed to Unadvise at the owner's word (2026-10-04), since VB6 also returns E_NOINTERFACE from Advise. Stated in docs/Reference/COM-Interfaces/IConnectionPoint.md, sections Advise (the second bullet of "In twinBASIC", which says VB6 returns E_NOINTERFACE too: no change when this is fixed) and Unadvise (the WARNING, which names BETA 995, about a cookie that names no connection) and the last example, whose comments show 80004002 and 0: when fixed, replace the WARNING with a NOTE saying since which build, and change the rest. When the page is updated, state the code twinBASIC returns for a bad cookie. -->
+<!-- Reproducer: bugs/advise-unadvise-hresults/ (mode run, expects tbrun exit 0 and the three lines above); verified on 995. VB6 side in bugs/advise-unadvise-hresults/vb6/ (VB6 6.0), the output above; it ends at `before Unadvise 0` because that call crashes the exe. Narrowed to Unadvise at the owner's word (2026-10-04), since VB6 also returns E_NOINTERFACE from Advise. Stated in docs/Reference/COM-Interfaces/IConnectionPoint.md, sections Advise (the second bullet of "In twinBASIC", which says VB6 returns E_NOINTERFACE too: no change when this is fixed) and Unadvise (the WARNING, which names BETA 995, about a cookie that names no connection) and the last example, whose comments show 80004002 and 0: when fixed, remove the WARNING, and change the rest. When the page is updated, state the code twinBASIC returns for a bad cookie. -->
 
 ---
 
@@ -1417,7 +1417,7 @@ The same difference exists for the high end of the index range: VB6 draws `&H800
 
 The change is `TranslateColor2` in the VB package's `Graphics.twin`, which `Line`, `Circle` and `PSet` call on `Color`: for a top byte of `&H80` it returns the system colour when the value minus `&H80000000` is 0 to 30 and 0 otherwise, and for any other value it returns the low 24 bits.
 
-<!-- Reproducer: bugs/system-colour-extra-bytes-black/ (mode run, expects the three lines above in twinBASIC); verified on 995, with 983 as the control (F0F0F0, F0F0F0, DBCDBF). The VB6 project is in bugs/system-colour-extra-bytes-black/vb6/ (`bug_repro.mjs vb6 system-colour-extra-bytes-black` prints the three lines above). The fuller sweep (about 45 colour values on 995, 983 and VB6) is in .claude/tooling-review-scratch/beta995-probes/s73/forms/ (c1.out995.txt, c1.out983.txt, c1.outvb6.txt), local scratch files that are not in the repository. Stated in docs/Reference/Core/Graphics-Methods.md, section "Colour values" (the first bullet and the WARNING after it, which names BETA 995; the NOTE below the WARNING is the deliberate difference for indexes 25 to 30): when fixed, replace the WARNING with a NOTE saying since which build twinBASIC takes the index from the low 16 bits, and change the bullet. -->
+<!-- Reproducer: bugs/system-colour-extra-bytes-black/ (mode run, expects the three lines above in twinBASIC); verified on 995, with 983 as the control (F0F0F0, F0F0F0, DBCDBF). The VB6 project is in bugs/system-colour-extra-bytes-black/vb6/ (`bug_repro.mjs vb6 system-colour-extra-bytes-black` prints the three lines above). The fuller sweep (about 45 colour values on 995, 983 and VB6) is in .claude/tooling-review-scratch/beta995-probes/s73/forms/ (c1.out995.txt, c1.out983.txt, c1.outvb6.txt), local scratch files that are not in the repository. Stated in docs/Reference/Core/Graphics-Methods.md, section "Colour values" (the first bullet and the WARNING after it, which names BETA 995; the NOTE below the WARNING is the deliberate difference for indexes 25 to 30): when fixed, remove the WARNING, and change the bullet to say twinBASIC takes the index from the low 16 bits. -->
 
 ---
 
@@ -1482,7 +1482,7 @@ Severity: low. `ForeColor` raises the error on the surfaces and the other proper
 
 What was tried: the same lines on BETA 983 print the same, so this is not a change of BETA 984. A value that is a valid colour, such as `&H100FF00` or `&H20000FF`, is accepted by `ForeColor` with no error, as in VB6. Besides the attached project, each of `-1`, `&H8000001F` and `&HFF0000FF` was assigned to every colour property of a UserControl (placed on the form), CheckBox, Frame, ListBox, Shape, ComboBox, DirListBox, DriveListBox, FileListBox, OptionButton and OLE in a project of its own, on BETA 995 and 983 and in VB6: the results are the same as above, error 5 for the UserControl's `ForeColor` and none for the rest in twinBASIC, error 380 and the old value kept in VB6. The twinBASIC-only controls behave the same (`QRCode.ForeColor` raises error 5, `CheckMark.BackColor` and `MultiFrame.BackColor` raise nothing), and so do `CommandButton.ForeColor` and the Data control's colours, which VB6 has no counterpart or no loadable project for. The package source explains the pattern: the colour properties are plain stored fields (`Public ForeColor As OLE_COLOR` and so on, in `GraphicsBase` for Form, PictureBox, UserControl, PropertyPage and Report, and declared again in each control), with nothing that validates the value; the error 5 comes from the `ForeColor` change handler of `GraphicsBase`, which runs after the value is stored.
 
-<!-- Reproducer: bugs/forecolor-invalid-value-stored/ (mode run, expects the seventeen lines above in twinBASIC); verified on 995 and 983. The VB6 project is in bugs/forecolor-invalid-value-stored/vb6/ (`bug_repro.mjs vb6 forecolor-invalid-value-stored` prints the seventeen lines above). The wider sweep (every colour property of the classes named under "What was tried", three values each, on 995, 983 and VB6) is in .claude/tooling-review-scratch/beta995-probes/s73/colours/ (c4.out995.txt, c4.out983.txt, c5.outvb6.txt, c6.Data.outvb6.txt, c3.out*.txt for the UserControl), local scratch files that are not in the repository. Stated in a WARNING naming BETA 995 under each of the colour properties on the pages under docs/Reference/Default/VB/ for: Form, PictureBox, UserControl, PropertyPage, Report, Printer, Label, TextBox, CommandButton, CheckBox, OptionButton, Frame, ListBox, ComboBox, DirListBox, DriveListBox, FileListBox, Shape, OLE (the VB6 comparison is in the WARNING) and Data, CheckMark, MultiFrame, QRCode (twinBASIC behaviour only; CommandButton.ForeColor likewise). PropertyPage and Report were not run: they inherit GraphicsBase, as Form does. MDIForm carries none: its BackColor assigns a separate field and its ForeColor and FillColor raise an unsupported-property error, and none was run. When fixed, replace each WARNING with a NOTE saying since which build. -->
+<!-- Reproducer: bugs/forecolor-invalid-value-stored/ (mode run, expects the seventeen lines above in twinBASIC); verified on 995 and 983. The VB6 project is in bugs/forecolor-invalid-value-stored/vb6/ (`bug_repro.mjs vb6 forecolor-invalid-value-stored` prints the seventeen lines above). The wider sweep (every colour property of the classes named under "What was tried", three values each, on 995, 983 and VB6) is in .claude/tooling-review-scratch/beta995-probes/s73/colours/ (c4.out995.txt, c4.out983.txt, c5.outvb6.txt, c6.Data.outvb6.txt, c3.out*.txt for the UserControl), local scratch files that are not in the repository. Stated in a WARNING naming BETA 995 under each of the colour properties on the pages under docs/Reference/Default/VB/ for: Form, PictureBox, UserControl, PropertyPage, Report, Printer, Label, TextBox, CommandButton, CheckBox, OptionButton, Frame, ListBox, ComboBox, DirListBox, DriveListBox, FileListBox, Shape, OLE (the VB6 comparison is in the WARNING) and Data, CheckMark, MultiFrame, QRCode (twinBASIC behaviour only; CommandButton.ForeColor likewise). PropertyPage and Report were not run: they inherit GraphicsBase, as Form does. MDIForm carries none: its BackColor assigns a separate field and its ForeColor and FillColor raise an unsupported-property error, and none was run. When fixed, remove each WARNING. -->
 
 ---
 
@@ -1517,7 +1517,7 @@ Severity: low to medium. Typing into the box was not tried; the gap is the assig
 
 What was tried: BETA 983 prints the same two lines. Assigning the same long text a second time raises no `Change` event, in twinBASIC and in VB6.
 
-<!-- Reproducer: bugs/textbox-text-ignores-maxlength/ (mode run, expects the two lines above in twinBASIC); verified on 995 and 983. The VB6 project is in bugs/textbox-text-ignores-maxlength/vb6/ (`bug_repro.mjs vb6 textbox-text-ignores-maxlength` prints the two lines above). Stated in docs/Reference/Default/VB/TextBox/index.md, the MaxLength section, in a WARNING that names BETA 995 ("assigning Text in code is not limited by MaxLength"): when fixed, replace it with a NOTE saying since which build Text is truncated. -->
+<!-- Reproducer: bugs/textbox-text-ignores-maxlength/ (mode run, expects the two lines above in twinBASIC); verified on 995 and 983. The VB6 project is in bugs/textbox-text-ignores-maxlength/vb6/ (`bug_repro.mjs vb6 textbox-text-ignores-maxlength` prints the two lines above). Stated in docs/Reference/Default/VB/TextBox/index.md, the MaxLength section, in a WARNING that names BETA 995 ("assigning Text in code is not limited by MaxLength"): when fixed, remove it and state that Text is truncated. -->
 
 ---
 
diff --git a/WIP.ExamplesBuild.md b/WIP.ExamplesBuild.md
index 2b9ff4920..19fbf9856 100644
--- a/WIP.ExamplesBuild.md
+++ b/WIP.ExamplesBuild.md
@@ -746,12 +746,10 @@ that fails only the second is one LLVM cannot generate code for.
   reads the DEBUG CONSOLE, which nothing removes an entry from, and exits 4 naming the file
   the compiler died parsing. **Treat any tooling that infers "finished" from "stopped
   changing" as suspect on this compiler.**
-- **A two-line syntax skeleton crashes the compiler**, and it is in the corpus:
-  `Interface <name> Extends <base-interface>` / `End Interface`, in
-  `Reference/Attributes.md`. The placeholder name does it, given any `Extends` clause:
-  `Extends IBase` crashes it too. Recorded in [BUGS-TO-REPORT.md](BUGS-TO-REPORT.md). The
-  classifier refuses a `<placeholder>` as a declaration name, so it takes an explicit
-  `slot=` to reach the compiler with one.
+- **The classifier refuses a `<placeholder>` as a declaration name**, so a syntax skeleton
+  such as `Interface <name> Extends <base-interface>` / `End Interface` (in
+  `Reference/Attributes.md`) takes an explicit `slot=` to reach the compiler. Through BETA
+  995 that skeleton crashed the compiler (twinbasic/twinbasic#2453, fixed in 997).
 - **`project.buildPath` must be an explicit file.** The default `${SourcePath}\Build\...`
   template opens a native Save dialog, which on the private desktop is invisible and
   unreachable, so the build silently never happens --- and the WebView2 renderer stays
diff --git a/WIP.Harness.md b/WIP.Harness.md
index c0ca6ccdd..78319254c 100644
--- a/WIP.Harness.md
+++ b/WIP.Harness.md
@@ -216,9 +216,10 @@ other 193 are refused at every site.
   one form able to pass never compiled is inconclusive, not refused, and the same holds for a
   run cut short.
 
-**It found a compiler crash the documentation never would:** a bare `[PopulateFrom]` on an
-Enum kills the compiler, at all three Enum sites; the tool isolated it by halving to one
-probe beside the canaries. It is in [BUGS-TO-REPORT.md](BUGS-TO-REPORT.md).
+**It finds compiler crashes the documentation never would:** a crash in a batch is
+isolated by halving down to one probe beside the canaries, which is how a bare
+`[PopulateFrom]` on an Enum was found to kill the compiler (twinbasic/twinbasic#2450, fixed
+in BETA 997).
 
 **Read the report's "accepted at most sites" section before believing an acceptance.**
 `[Description]` is taken at 53 of 61 sites and `[Hidden]` and `[Restricted]` at 42: either
diff --git a/WIP.HelpAddin.md b/WIP.HelpAddin.md
index d172f2058..96279ae78 100644
--- a/WIP.HelpAddin.md
+++ b/WIP.HelpAddin.md
@@ -625,8 +625,7 @@ run, and the failure says what to update. The lanes and what rests on each:
 - [panes.test.mjs](test/addin/panes.test.mjs) (P3, P4, P12, and the shared id `""` found
   with P9): the NOTEs on the HtmlElement, HtmlElementProperties, HtmlElements and ToolWindow
   pages.
-- [symbols.test.mjs](test/addin/symbols.test.mjs) (P5): Stage 4's context and an entry in
-  BUGS-TO-REPORT.md. It needs no add-in, only the project in `probes/symbols`.
+- [symbols.test.mjs](test/addin/symbols.test.mjs) (P5, P15): Stage 4's context. It needs no add-in, only the project in `probes/symbols`.
 - [ideserver.test.mjs](test/addin/ideserver.test.mjs) (P13): the offline route.
 - [appdata.test.mjs](test/addin/appdata.test.mjs) (P6): the lanes' own `APPDATA` and the
   FAQ's answer on where add-ins go.
@@ -648,7 +647,7 @@ The table gives each answer in brief; the sections above have the detail.
 | # | Question | What it decides |
 |---|---|---|
 | P1 | Do `{ctrl}` and `{alt}` add-in shortcuts ever fire? **Answered, BETA 983 and 995: no.** `d`, `{shift}d`, `f1` and `{shift}f1` fire; `{ctrl}{shift}d`, `{ctrl}d` and `{alt}f` fire only when the same key was pressed on its own less than 500 ms before. Queued in BUGS-TO-REPORT.md; the KeyboardShortcuts page has a NOTE. | the bug report; which key the add-in uses; the NOTE on the KeyboardShortcuts page |
-| P2 | Does the add-in's `f1` fire with focus in the code editor, and what happens with signature help showing? **Answered, BETA 983 and 995: yes.** It fires with the focus in the code editor, in the DEBUG CONSOLE and on nothing, and types nothing. With signature help showing, the IDE expands or collapses it as well, and logs `command failed: "tbHelp_ToggleExpandSignatureHelp"`. | F1 or another key --- F1 |
+| P2 | Does the add-in's `f1` fire with focus in the code editor, and what happens with signature help showing? **Answered, BETA 983 and 995: yes.** It fires with the focus in the code editor, in the DEBUG CONSOLE and on nothing, and types nothing. With signature help showing, the IDE expands or collapses it as well. | F1 or another key --- F1 |
 | P3 | Does an `iframe` of a documentation page load and navigate inside a tool window? **Answered, BETA 983 and 995: yes.** It loads, follows its own links, moves when the add-in sets `src`, scrolls, and fills the window under a wrapper's flex layout; the live site works too. Keys in the frame never reach the add-in, and the page's colour scheme is Windows', not the IDE's. | how pages are shown --- in the pane |
 | P4 | Does `innerHTML` render, and do inline handlers in it run page script? **Answered, BETA 983 and 995: yes, and yes.** Inline handlers run as the IDE page's own script, with its globals in reach. A property whose name starts with `on` is dropped, and the add-in hears no error. | how summaries are drawn; whether the page-internals route exists --- it does |
 | P5 | What does hover return for `MsgBox`, `Collection.Add`, `ToolWindows.Add` and a symbol declared in the project? What does definition return for a package symbol? **Answered, BETA 983 and 995:** hover gives the declaration, then a heading naming where it is declared: `in VBA.Interaction`, `in VBA._Collection`, `in tbIDE.IToolWindowsV1`, `in SymbolsProbe.Symbols` --- a class's members by its default interface, not by the class's name. Definition gives the declaration in the package's own source, which the IDE opens. Nothing for `Debug.Print` or a statement. Only page script can ask. | compiler-assisted context is possible; which route is [Stage 4](#stage-4-the-add-in-in-increments), increment 3 |
@@ -661,7 +660,7 @@ The table gives each answer in brief; the sections above have the detail.
 | P12 | Does `raiseEvent` from plain tool-window HTML throw? **Answered, BETA 983 and 995: yes** --- `TypeError: Cannot read properties of null (reading 'rootEventHandler')`, and the listener is not called. An inline handler that calls the listener `AddEventListener` stored on its parent, `this.parentNode.<name>(event)`, reaches the add-in. | how the pane's events are written |
 | P13 | Does the compiler's HTTP server serve any file placed under `ide\`? **Answered, BETA 983 and 995: yes**, and it is the page server, `twinBASIC_win32.exe --ide=<pid>`, not the compiler. A frame with a relative `src` shows the file on the IDE page's own origin. A query string makes a 404, and `.html` has no `Content-Type`. | an offline route --- it exists ([Offline](#ways-to-show-a-page)) |
 | P14 | What do `tbCreateCompilerAddin_v2` and `_v3` expect? **Answered, BETA 983 and 995: what `tbCreateCompilerAddin` does.** The names are version stamps: the linker exports a function named `tbCreateCompilerAddin` as `tbCreateCompilerAddin_v3` alone, and an IDE that knows none of a DLL's names refuses it as `compiled for a newer version of the twinBASIC IDE`, as a patched `_v4` was. | nothing in the design --- the add-in declares `tbCreateCompilerAddin` as the package says; the tbIDE page has a NOTE |
-| P15 | Does the compiler say anything about a name's `[Description]`, or a COM type library's help string? **Answered, BETA 995: hover gives it**, after the line naming where the name is declared, for a procedure, a member, a constant, a module variable, an enumeration, a `Type`, a class and a module, and a type library's member (`Scripting.IDictionary.Add`: "Add a new key and item to the dictionary."). Classes and modules, the project's and a type library's, are `in library <name>`. A procedure with none gets the IDE's tip, `*no further info available. Tip: use [Description("")] ...*`. On a procedure's name where it is declared, hover gives a block of code-generation details (`TB-DEBUG CODEGEN SIZE: [NOT-READY]`) instead. Signature help gives the same text. A member of an enumeration is the exception: its `[Description]` is listed as a member of the enumeration and not shown on the member (filed as twinbasic/twinbasic#2465, `bugs/filed/enum-member-description-hover/`). | Stage 4, increment 4: a name with no page shows its declaration and description from the hover; no parser of the project's source is needed |
+| P15 | Does the compiler say anything about a name's `[Description]`, or a COM type library's help string? **Answered, BETA 995: hover gives it**, after the line naming where the name is declared, for a procedure, a member, a constant, a module variable, an enumeration, a `Type`, a class and a module, and a type library's member (`Scripting.IDictionary.Add`: "Add a new key and item to the dictionary."). Classes and modules, the project's and a type library's, are `in library <name>`. A procedure with none gets the IDE's tip, `*no further info available. Tip: use [Description("")] ...*`. On a procedure's name where it is declared, hover gives a block of code-generation details (`TB-DEBUG CODEGEN SIZE: [NOT-READY]`) instead. Signature help gives the same text. A member of an enumeration has none: a `[Description(...)]` line inside an `Enum` is not an attribute but a member of its own, named by a bracketed identifier, as VB6 allows (`Debug.Print Shade.[Description("The light one.")]` prints its value), so hover lists it as a member of the enumeration (twinbasic/twinbasic#2465, closed as not a bug). | Stage 4, increment 4: a name with no page shows its declaration and description from the hover; no parser of the project's source is needed |
 
 ### Stage 3: the symbol index, generated by the docs build
 
diff --git a/WIP.md b/WIP.md
index 1cbeb3741..3c769eccf 100644
--- a/WIP.md
+++ b/WIP.md
@@ -216,7 +216,7 @@ The vocabulary tables further down cover word choice. The rules in this subsecti
 
    One callout per concern; don't stack a NOTE and an IMPORTANT for the same point.
 
-   **A known twinBASIC defect that silently gives a wrong result is a `> [!WARNING]` until a fixed build is released** (owner's rule): a wrong value with no error raised is data corruption the reader cannot see. A crash is a WARNING too (unsaved data is lost), and so is an error that hides a silent part (a procedure run twice before the error). A defect the reader cannot miss and that loses nothing --- an error raised, a statement refused --- is a `> [!NOTE]`. Name the build in either; once fixed, it becomes a NOTE saying since which build. The defect's BUGS-TO-REPORT entry says in its HTML comment which page carries the callout, so the callout is changed when the entry is retired.
+   **A known twinBASIC defect that silently gives a wrong result is a `> [!WARNING]` until a fixed build is released** (owner's rule): a wrong value with no error raised is data corruption the reader cannot see. A crash is a WARNING too (unsaved data is lost), and so is an error that hides a silent part (a procedure run twice before the error). A defect the reader cannot miss and that loses nothing --- an error raised, a statement refused --- is a `> [!NOTE]`. Name the build in either. **Once a fixed build is released, the callout goes** (owner's rule, 2026-10-05): the documentation is not a record of past defects, so the page then states the correct behaviour with no mention of the defect. The defect's BUGS-TO-REPORT entry says in its HTML comment which page carries the callout, so the callout is removed when the entry is retired.
 
 7. **See Also.** Last section on the page, after `Example`. Format: `- [Symbol](Symbol) <noun>` where `<noun>` is the kind: statement, function, property, method, class, module, package. Pages with annotations use `- [Symbol](Symbol) -- short description` — the `--` source renders as a typographic dash via markdown-it's typographer (en-dash for `--`, em-dash for `---`). Don't write literal `—` in source; keep `--` for consistency across the docs. Order by conceptual proximity, not strict alphabetical.
 
diff --git a/bugs/filed/asnew-optional-ctor/REPORT.md b/bugs/filed/asnew-optional-ctor/REPORT.md
deleted file mode 100644
index 639f9bd08..000000000
--- a/bugs/filed/asnew-optional-ctor/REPORT.md
+++ /dev/null
@@ -1,40 +0,0 @@
-Filed as [twinbasic/twinbasic#2459](https://github.com/twinbasic/twinbasic/issues/2459).
-
-## `As New` refuses a class whose only constructor has all-`Optional` arguments
-
-**Describe the bug**
-`Dim x As New C` fails with TB5121 when the only constructor of `C` has nothing but `Optional` arguments, so it can be called with none. The same class passes TB5135, the check for COM exposure: it compiles as a public class without `[COMCreatable(False)]`, so that check counts the constructor as one that takes no arguments. The two checks for "can this class be created without arguments" disagree.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `asnew-optional-ctor.twinproj` (attached as `asnew-optional-ctor.zip`). Its one source file, `Probe.twin`, holds the whole bug:
-   ```
-   Class COpt
-       Public V As Long
-       Public Sub New(Optional ByVal n As Long = 3)
-           V = n
-       End Sub
-   End Class
-   
-   Module Probe
-       Public Sub T()
-           Dim x As New COpt
-           Debug.Print x.V
-       End Sub
-   End Module
-   ```
-2. See the project fail to compile, on the `Dim`, with `TB5121 can't use this type with As-New syntax as it doesn't have a parameterless constructor`.
-
-What does not reproduce it: a class with a `Class_Initialize` beside a `Sub New` that takes a required argument, or with a second `Sub New` with no parameters, is accepted. A class whose only `Sub New` takes a required argument is refused, `Private` or `[COMCreatable(False)]` alike, which is the diagnostic working as intended.
-
-**Expected behavior**
-The project compiles, and `x.V` prints `3`, as it does on BETA 983. A constructor whose arguments are all `Optional` can be called without arguments, which is what `As New` needs.
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-BETA 983 accepts the reproducer and runs it. TB5121 is the diagnostic BETA 993's notes describe ("classes with [COMCreatable(False)] set on them cannot be used as an As-New datatype"), corrected in 995. Severity: code that compiled before BETA 993 stops compiling.
-
-<!-- Reproducer: bugs/asnew-optional-ctor/ (mode compile, expects TB5121); on 983 it compiles clean, so verify there reports NO LONGER REPRODUCES, as it should. Observed on 2026-10-01 with compile probes through tbbuild, each case a project of its own, on BETA 995 and BETA 983; the run on 983 was a compiled EXE through tbrun. docs/Reference/Core/New.md states that a class whose only Sub New takes arguments, even if every argument is Optional, fails As New with TB5121; when this is fixed, that sentence is wrong for the Optional case. -->
diff --git a/bugs/filed/asnew-optional-ctor/asnew-optional-ctor.twinproj b/bugs/filed/asnew-optional-ctor/asnew-optional-ctor.twinproj
deleted file mode 100644
index 96098ce6db43bee291b4711026a3a8023144dd82..0000000000000000000000000000000000000000
GIT binary patch
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diff --git a/bugs/filed/asnew-optional-ctor/repro.json b/bugs/filed/asnew-optional-ctor/repro.json
deleted file mode 100644
index 8d3ed22b9..000000000
--- a/bugs/filed/asnew-optional-ctor/repro.json
+++ /dev/null
@@ -1,9 +0,0 @@
-{
-  "mode": "compile",
-  "expect": {
-    "diagnostics": [
-      "TB5121"
-    ]
-  },
-  "issue": 2459
-}
diff --git a/bugs/filed/asnew-optional-ctor/src/Settings b/bugs/filed/asnew-optional-ctor/src/Settings
deleted file mode 100644
index d1f654b73..000000000
--- a/bugs/filed/asnew-optional-ctor/src/Settings
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "AsnewOptionalCtor",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard EXE",
-	"project.description": "Reproduces: `As New` refuses a class whose only constructor has all-`Optional` arguments",
-	"project.exportPathIsV2": true,
-	"project.id": "{3E2698F7-6F1E-4F69-B66D-7135C879453E}",
-	"project.name": "AsnewOptionalCtor",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"symbolId": "stdole",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "VB",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 31
-		},
-		{
-			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "AppGlobalClassProject",
-			"versionBuild": 0,
-			"versionMajor": 1,
-			"versionMinor": 0,
-			"versionRevision": 0
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.startupObject": "Sub Main",
-	"project.warnings": {
-		"errors": [],
-		"hints": [],
-		"ignored": [],
-		"info": [],
-		"warnings": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/asnew-optional-ctor/src/Sources/Probe.twin b/bugs/filed/asnew-optional-ctor/src/Sources/Probe.twin
deleted file mode 100644
index 16a1482a4..000000000
--- a/bugs/filed/asnew-optional-ctor/src/Sources/Probe.twin
+++ /dev/null
@@ -1,14 +0,0 @@
-' As New refuses a class whose only constructor has all-Optional arguments (TB5121), though the same class passes the COM-exposure check.
-Class COpt
-    Public V As Long
-    Public Sub New(Optional ByVal n As Long = 3)
-        V = n
-    End Sub
-End Class
-
-Module Probe
-    Public Sub T()
-        Dim x As New COpt
-        Debug.Print x.V
-    End Sub
-End Module
diff --git a/bugs/filed/asnew-optional-ctor/src/Sources/Startup.twin b/bugs/filed/asnew-optional-ctor/src/Sources/Startup.twin
deleted file mode 100644
index 20233b3a9..000000000
--- a/bugs/filed/asnew-optional-ctor/src/Sources/Startup.twin
+++ /dev/null
@@ -1,6 +0,0 @@
-Module Startup
-
-    Public Sub Main()
-    End Sub
-
-End Module
diff --git a/bugs/filed/circle-positive-angle-unchecked/REPORT.md b/bugs/filed/circle-positive-angle-unchecked/REPORT.md
deleted file mode 100644
index c2a2ad4e3..000000000
--- a/bugs/filed/circle-positive-angle-unchecked/REPORT.md
+++ /dev/null
@@ -1,41 +0,0 @@
-Filed as [twinbasic/twinbasic#2463](https://github.com/twinbasic/twinbasic/issues/2463).
-
-## `Circle` with a positive angle above 2 pi raises no error and draws an arc, where VB6 raises error 5
-
-**Describe the bug**
-`Circle` does not check a positive *Start* or *End*. VB6 accepts angles from -2 pi to 2 pi and raises error 5 (*Invalid procedure call or argument*) for any other, drawing nothing. twinBASIC raises error 5 for a negative angle below -2 pi, as VB6 does, but a positive angle above 2 pi raises nothing and is drawn as if 2 pi had been subtracted from it: `Form1.Circle (195, 65), 50, vbRed, 7, 3` draws the arc from 0.72 to 3 radians. Observed by drawing on a form with `AutoRedraw` on, printing `Err.Number`, and saving what the form holds as a picture.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `circle-positive-angle-unchecked.twinproj` (attached as `circle-positive-angle-unchecked.zip`). Its `Sub Main` loads `Form1` without showing it, sets `AutoRedraw`, `ScaleMode = vbPixels`, a white background and a client area of 260 x 130 pixels, and then runs:
-   ```
-   Form1.Circle (65, 65), 50, vbBlue, -0.5, -2
-   On Error Resume Next
-   Form1.Circle (195, 65), 50, vbRed, 7, 3
-   n = Err.Number
-   On Error GoTo 0
-   Debug.Print "Circle Start 7: Err " & n
-   PngDump.Surface Form1, "main"
-   ```
-   The blue pie is a valid call, there to give the picture a reference. `PngDump` is a module in the project that copies the form's pixels with `BitBlt` and saves them as `main.png` with GDI+, so the picture does not depend on twinBASIC's own picture code.
-2. Run it.
-3. The DEBUG CONSOLE shows `Circle Start 7: Err 0`, and `main.png` shows a red arc beside the pie.
-
-**Expected behavior**
-Error 5, and nothing drawn by the second call, as VB6 does. The VB6 project (attached as `circle-positive-angle-unchecked-vb6.zip`, the same code with the same `PngDump` module) prints `Circle Start 7: Err 5`, and its picture holds the pie alone.
-
-**Screenshots**
-What twinBASIC BETA 995 drew on the left, what VB6 drew in the middle, and on the right the 101 pixels that differ, in red over a grey copy of the VB6 picture:
-
-![Circle drawn by twinBASIC BETA 995 and by VB6, and the pixels that differ](images/main-compare.png)
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-Severity: low. A program whose angle grows past 2 pi by mistake gets a drawing instead of the error that would show the mistake.
-
-What was tried: BETA 983 behaves the same. A *Start* of 2 pi + 0.001 and an *End* of 7 are drawn the same way; -7 and -2 pi - 0.001, as *Start* or *End*, raise error 5 and draw nothing in both twinBASIC and VB6. VB6's limit is a little above 2 pi, the same for either sign: the **Single** 6.283186 is accepted and 6.283187 refused, and twinBASIC refuses the same negative values. The rest of `Circle`'s angle handling matches VB6: a negative angle draws the radius to that end, a pie (both negative) is filled with `FillColor` and `FillStyle`, and an arc with one radius or none is not. The package source shows the cause: `Circle` in the VB package's `Graphics.twin` compares the angle with `6.28318619728` only inside `If Start < 0 Then` (and `If _End < 0 Then`), after taking its absolute value, so a positive angle is never compared.
-
-<!-- Reproducer: bugs/circle-positive-angle-unchecked/ (mode run, expects the line `Circle Start 7: Err 0`, and expect.imagesDiffer: the picture differs from images/main-vb6.png); run on 995. The VB6 project is in vb6/ (`bug_repro.mjs vb6 circle-positive-angle-unchecked`). The sweep behind "What was tried" (every case on 995, 983 and VB6) is in .claude/tooling-review-scratch/beta995-probes/s75/ (circle.out995.txt, circle.out983.txt, circle.outvb6.txt), local scratch files that are not in the repository. Stated in a WARNING naming BETA 995 in docs/Reference/Core/Graphics-Methods.md (section "What the built-in surfaces do with the flags") and under Circle's Start/End on the pages for Form, PictureBox, Printer, UserControl, Report and PropertyPage under docs/Reference/Default/VB/. Only Form was run; the other five share the same implementation. When fixed, replace each WARNING with a NOTE saying since which build. -->
diff --git a/bugs/filed/circle-positive-angle-unchecked/circle-positive-angle-unchecked.twinproj b/bugs/filed/circle-positive-angle-unchecked/circle-positive-angle-unchecked.twinproj
deleted file mode 100644
index 4867f70d4a54ffbfb8c7d7990d7257cada4ca03d..0000000000000000000000000000000000000000
GIT binary patch
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z>-&XIfx5wm@}3nQDe&39d}{>H>`e7lJ64{$e*I16+VDep*4JAWcRt);#-DRlXqo0N
zecL%pTOJ?zu;h}k)<ezG?O}hMUiU3;N$-4EDXJcFh;wQA^7g|=3YsL&X_+h$I=6D)
zzF*&?Q=L@jsI@VA@o2VPmde@iLpT5N-a04M9)-5xRcF-N1gms5K8Vd%)=V@^vRD(q
zW^KrGDXm{LZ%+)Hv}%uXTYJcv1ogJUBOi8Odhg5gxFqW7*YErOE)u%eF0n7%wt22Z
zTh_L-+<E)mLCV$I_Lo#8BuT8j@1(xB@oo0(y?TZ~!8XY^M+~A)xAs-B#TwtxNNh6i
zU04XT$>&1p@^rbwT>PFq!h6DbZtstJBHEeQbj;fJi`=!74Vl;a9ocMFd^i62b?WJc
z<GRw#{{<{o{jL7_{pjh2=Q^UzJQm5V+c%plF#AQRuvwh9Zo-#zu%ssX2z_|^`7?j&
X;YE+FgPlZxd4$2!)z4*}Q$iB}U^Ho#

diff --git a/bugs/filed/circle-positive-angle-unchecked/images/main-vb6.png b/bugs/filed/circle-positive-angle-unchecked/images/main-vb6.png
deleted file mode 100644
index 1c2dc4ceb38c9d6c3ab1762caee97df92bc15451..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

literal 678
zcmeAS@N?(olHy`uVBq!ia0y~yU}OQZn>d(&r2ZF09U#S69OUlAu<o49OCX0O-O<;P
zfnj4m_n$;oAfL0qBeIx*f$uN~Gak=hk;1^hWbNtV7*Y}U_Uc2wLk<G1f%pC|op^#b
z(B*c}ip`s!FR|w}ocTM|KmEaE356pJifkN)4jqh6JOW7#0?aL_LW_?TSlRx2kjZ@J
zdEUG0@6F5W%YG*W-krIp?D+b>rcqkk`^wjUySxAVj#WL6e)M`ZS*t$#(7$+(+Cnb9
zwEl-~LLocrCn|a+r6pB3@E2>9l-YjRf8>L<?U`lQ4sw4}=&bBWoGGWK*cST5pt;C>
z-JNEYD&fOsRT*m@<!bZ$@$_~k8rznHe%Vm<pdzValH9MA)j|Et?81jXf4SiEvien{
za%ZBx?Uum5ljPX>l-tBFIP){l+4$p%-v4<LRRV|gj9#SlB#Ygd!@f}7Fh{L<UE9vA
z*1sngm>aH9YL*0A&7)>`X>Py#QuaixqzWH4VW~F{*m*+OE(;wtH=1#?;&}b#I9rYm
zN46sqv@5Qbr5*^Md`yA4PO4O}dYKNh+$?Q2ex`bf3aQy?y3Ar<`yJWVn0)gQ3)f@5
zmMz`P-nh2y{^|2aPd7Z@(&fnZ=3=7tb+(iPe!fW!f8TIm4{a<FKu@6q%Rm2Qc9P4{
Vc>AzV5}39aJYD@<);T3K0RUi~^y&Zr

diff --git a/bugs/filed/circle-positive-angle-unchecked/images/tb-beta.txt b/bugs/filed/circle-positive-angle-unchecked/images/tb-beta.txt
deleted file mode 100644
index 6e1fc58db..000000000
--- a/bugs/filed/circle-positive-angle-unchecked/images/tb-beta.txt
+++ /dev/null
@@ -1 +0,0 @@
-995
diff --git a/bugs/filed/circle-positive-angle-unchecked/repro.json b/bugs/filed/circle-positive-angle-unchecked/repro.json
deleted file mode 100644
index 77c46636c..000000000
--- a/bugs/filed/circle-positive-angle-unchecked/repro.json
+++ /dev/null
@@ -1,14 +0,0 @@
-{
-  "mode": "run",
-  "images": [
-    "main"
-  ],
-  "expect": {
-    "exit": 0,
-    "output": [
-      "^Circle Start 7: Err 0$"
-    ],
-    "imagesDiffer": true
-  },
-  "issue": 2462
-}
diff --git a/bugs/filed/circle-positive-angle-unchecked/src/Settings b/bugs/filed/circle-positive-angle-unchecked/src/Settings
deleted file mode 100644
index 98af685ba..000000000
--- a/bugs/filed/circle-positive-angle-unchecked/src/Settings
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "CirclePositiveAngleUnchecked",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard EXE",
-	"project.description": "Reproduces: Circle accepts a Start or End above 2 pi, and draws a short arc where VB6 raises error 5",
-	"project.exportPathIsV2": true,
-	"project.id": "{6E04B665-A7E0-4612-AA05-759573420612}",
-	"project.name": "CirclePositiveAngleUnchecked",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"symbolId": "stdole",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "VB",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 31
-		},
-		{
-			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "AppGlobalClassProject",
-			"versionBuild": 0,
-			"versionMajor": 1,
-			"versionMinor": 0,
-			"versionRevision": 0
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.startupObject": "Sub Main",
-	"project.warnings": {
-		"errors": [],
-		"hints": [],
-		"ignored": [],
-		"info": [],
-		"warnings": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/circle-positive-angle-unchecked/src/Sources/Form1.tbform b/bugs/filed/circle-positive-angle-unchecked/src/Sources/Form1.tbform
deleted file mode 100644
index 7fb728da5..000000000
--- a/bugs/filed/circle-positive-angle-unchecked/src/Sources/Form1.tbform
+++ /dev/null
@@ -1,95 +0,0 @@
-[
-	{
-		"AlwaysShowKeyboardCues": false,
-		"Appearance": "vbAppear3d",
-		"AutoRedraw": false,
-		"BackColor": -2147483633,
-		"BorderStyle": "vbSizable",
-		"Caption": "Form1",
-		"ClipControls": true,
-		"ControlBox": true,
-		"DrawMode": "vbCopyPen",
-		"DrawStyle": "vbSolid",
-		"DrawWidth": 1,
-		"Enabled": true,
-		"FillColor": 0,
-		"FillStyle": "vbFSTransparent",
-		"FontBold": false,
-		"FontItalic": false,
-		"FontName": "Segoe UI",
-		"FontSize": 8,
-		"FontStrikethru": false,
-		"FontTransparent": true,
-		"FontUnderline": false,
-		"ForeColor": -2147483630,
-		"FormDesignerId": "{EAEAEAEA-EAEA-EAEA-EAEA-EAEAEAEAEA01}",
-		"HasDC": true,
-		"Height": 300,
-		"HelpContextID": 0,
-		"Icon": [],
-		"KeyPreview": false,
-		"Left": 0,
-		"LinkMode": "vbLinkNone",
-		"LinkTopic": null,
-		"MDIChild": false,
-		"MaxButton": true,
-		"MaxHeight": 0,
-		"MaxWidth": 0,
-		"MinButton": true,
-		"MinHeight": 0,
-		"MinWidth": 0,
-		"MouseIcon": [],
-		"MousePointer": "vbDefault",
-		"Moveable": true,
-		"Name": "Form1",
-		"NegotiateMenus": false,
-		"OLEDropMode": "vbOLEDropNone",
-		"Opacity": 100,
-		"Palette": [],
-		"PaletteMode": "vbPaletteModeHalftone",
-		"Picture": [],
-		"PictureDpiScaling": false,
-		"RightToLeft": false,
-		"ScaleHeight": 4500,
-		"ScaleLeft": 0,
-		"ScaleMode": "vbTwips",
-		"ScaleTop": 0,
-		"ScaleWidth": 4500,
-		"ShowInTaskbar": true,
-		"StartUpPosition": "vbStartUpScreen",
-		"TabFocusAutoSelect": false,
-		"Tag": null,
-		"Top": 0,
-		"TopMost": false,
-		"TransparencyKey": -1,
-		"Visible": true,
-		"WhatsThisButton": false,
-		"WhatsThisHelp": false,
-		"Width": 300,
-		"WindowState": "vbNormal",
-		"__IDEOptions": {
-			"alignToGrid": false,
-			"gridHeight": 10,
-			"gridWidth": 10,
-			"lockedControls": [],
-			"multiColoredGrabbers": false,
-			"showGrid": true,
-			"showOutlines": false
-		},
-		"__lastUpdateMarker": 2061908507,
-		"_className": "Form",
-		"_clsid": "{33AD4F38-6699-11CF-B70C-00AA0060D393}",
-		"_children": [
-			{
-				"Index": -1,
-				"Name": "Label1",
-				"Left": 20,
-				"Top": 60,
-				"Width": 100,
-				"Height": 30,
-				"_className": "Label",
-				"_clsid": "{33AD4ED8-6699-11CF-B70C-00AA0060D393}"
-			}
-		]
-	}
-]
diff --git a/bugs/filed/circle-positive-angle-unchecked/src/Sources/Form1.twin b/bugs/filed/circle-positive-angle-unchecked/src/Sources/Form1.twin
deleted file mode 100644
index fa6a1c3a9..000000000
--- a/bugs/filed/circle-positive-angle-unchecked/src/Sources/Form1.twin
+++ /dev/null
@@ -1,9 +0,0 @@
-[Description("")]
-[FormDesignerId("EAEAEAEA-EAEA-EAEA-EAEA-EAEAEAEAEA01")]
-[PredeclaredId]
-Class Form1
-
-    Sub New()
-    End Sub
-
-End Class
diff --git a/bugs/filed/circle-positive-angle-unchecked/src/Sources/PngDump.twin b/bugs/filed/circle-positive-angle-unchecked/src/Sources/PngDump.twin
deleted file mode 100644
index 766d74baa..000000000
--- a/bugs/filed/circle-positive-angle-unchecked/src/Sources/PngDump.twin
+++ /dev/null
@@ -1,201 +0,0 @@
-Module PngDump
-
-    ' Saves what a surface or a window shows as a PNG file, for a bug report that is
-    ' best shown by a picture. The same module, as PngDump.bas, runs in VB6, so that the
-    ' two pictures can be put side by side (node scripts/bug_repro.mjs run, then vb6).
-    '
-    '     PngDump.Surface Form1, "main"       ' an object with an hDC: a Form, PictureBox, UserControl
-    '     PngDump.Window Text1.hWnd, "text"   ' a control with no hDC; its client area
-    '
-    ' The file is <folder>\<Name>.png. The folder is the BUGREPRO_IMAGES environment
-    ' variable, which bug_repro.mjs sets, or else App.Path. Name uses letters, digits,
-    ' - and _. Any failure raises error 5, whose Description says which call failed.
-    '
-    ' The pixels are copied with BitBlt (or PrintWindow) into a bitmap of this module's own
-    ' and saved with GDI+, so the picture is what was drawn, not what the object's Image
-    ' property or SavePicture would make of it.
-    '
-    ' The Declares are aliased to Png... names, so that a reproducer's own BitBlt or
-    ' SelectObject cannot collide with them.
-
-    Private Type PngGuid
-        Data1 As Long
-        Data2 As Integer
-        Data3 As Integer
-        Data4(0 To 7) As Byte
-    End Type
-
-    Private Type PngGdipInput
-        GdiplusVersion As Long
-        DebugEventCallback As LongPtr
-        SuppressBackgroundThread As Long
-        SuppressExternalCodecs As Long
-    End Type
-
-    Private Type PngRect
-        Left As Long
-        Top As Long
-        Right As Long
-        Bottom As Long
-    End Type
-
-    Private Type PngBmpHeader
-        biSize As Long
-        biWidth As Long
-        biHeight As Long
-        biPlanes As Integer
-        biBitCount As Integer
-        biCompression As Long
-        biSizeImage As Long
-        biXPelsPerMeter As Long
-        biYPelsPerMeter As Long
-        biClrUsed As Long
-        biClrImportant As Long
-    End Type
-
-    Private Declare PtrSafe Function PngGdiplusStartup Lib "gdiplus" Alias "GdiplusStartup" ( _
-        ByRef token As LongPtr, ByRef startInput As PngGdipInput, ByVal startOutput As LongPtr) As Long
-    Private Declare PtrSafe Sub PngGdiplusShutdown Lib "gdiplus" Alias "GdiplusShutdown" ( _
-        ByVal token As LongPtr)
-    Private Declare PtrSafe Function PngGdipCreateBitmapFromHBITMAP Lib "gdiplus" Alias "GdipCreateBitmapFromHBITMAP" ( _
-        ByVal hbm As LongPtr, ByVal hpal As LongPtr, ByRef bitmap As LongPtr) As Long
-    Private Declare PtrSafe Function PngGdipSaveImageToFile Lib "gdiplus" Alias "GdipSaveImageToFile" ( _
-        ByVal image As LongPtr, ByVal fileName As LongPtr, ByRef clsidEncoder As PngGuid, ByVal encoderParams As LongPtr) As Long
-    Private Declare PtrSafe Function PngGdipDisposeImage Lib "gdiplus" Alias "GdipDisposeImage" ( _
-        ByVal image As LongPtr) As Long
-    Private Declare PtrSafe Function PngCLSIDFromString Lib "ole32" Alias "CLSIDFromString" ( _
-        ByVal lpsz As LongPtr, ByRef pclsid As PngGuid) As Long
-    Private Declare PtrSafe Function PngCreateCompatibleDC Lib "gdi32" Alias "CreateCompatibleDC" ( _
-        ByVal hdc As LongPtr) As LongPtr
-    Private Declare PtrSafe Function PngCreateDIBSection Lib "gdi32" Alias "CreateDIBSection" ( _
-        ByVal hdc As LongPtr, ByRef pbmi As PngBmpHeader, ByVal usage As Long, ByRef ppvBits As LongPtr, _
-        ByVal hSection As LongPtr, ByVal offset As Long) As LongPtr
-    Private Declare PtrSafe Function PngSelectObject Lib "gdi32" Alias "SelectObject" ( _
-        ByVal hdc As LongPtr, ByVal hObject As LongPtr) As LongPtr
-    Private Declare PtrSafe Function PngDeleteObject Lib "gdi32" Alias "DeleteObject" ( _
-        ByVal hObject As LongPtr) As Long
-    Private Declare PtrSafe Function PngDeleteDC Lib "gdi32" Alias "DeleteDC" ( _
-        ByVal hdc As LongPtr) As Long
-    Private Declare PtrSafe Function PngBitBlt Lib "gdi32" Alias "BitBlt" ( _
-        ByVal hdcDest As LongPtr, ByVal xDest As Long, ByVal yDest As Long, ByVal cx As Long, ByVal cy As Long, _
-        ByVal hdcSrc As LongPtr, ByVal xSrc As Long, ByVal ySrc As Long, ByVal rop As Long) As Long
-    Private Declare PtrSafe Function PngGetClientRect Lib "user32" Alias "GetClientRect" ( _
-        ByVal hwnd As LongPtr, ByRef rc As PngRect) As Long
-    Private Declare PtrSafe Function PngPrintWindow Lib "user32" Alias "PrintWindow" ( _
-        ByVal hwnd As LongPtr, ByVal hdcBlt As LongPtr, ByVal flags As Long) As Long
-
-    ' Saves the pixels an object with an hDC has drawn, <Name>.png.
-    Public Sub Surface(ByVal Obj As Object, ByVal Name As String)
-        Dim target As String
-        Dim w As Long
-        Dim h As Long
-        Dim src As LongPtr
-        target = TargetFile(Name)
-        w = CLng(Obj.ScaleX(Obj.ScaleWidth, Obj.ScaleMode, vbPixels))
-        h = CLng(Obj.ScaleY(Obj.ScaleHeight, Obj.ScaleMode, vbPixels))
-        src = CLngPtr(Obj.hDC)
-        Capture 0, src, w, h, target
-    End Sub
-
-    ' Saves the client area of a window, <Name>.png: for a control with no hDC.
-    Public Sub Window(ByVal hWnd As LongPtr, ByVal Name As String)
-        Dim target As String
-        Dim rc As PngRect
-        target = TargetFile(Name)
-        If hWnd = 0 Then Err.Raise 5, "PngDump", "the window handle is 0"
-        If PngGetClientRect(hWnd, rc) = 0 Then
-            Err.Raise 5, "PngDump", "GetClientRect failed, error " & Err.LastDllError
-        End If
-        Capture hWnd, 0, rc.Right - rc.Left, rc.Bottom - rc.Top, target
-    End Sub
-
-    ' The file's path, or error 5 for a name that is empty or uses a character outside
-    ' letters, digits, - and _.
-    Private Function TargetFile(ByVal Name As String) As String
-        Dim i As Long
-        Dim c As Long
-        Dim folder As String
-        If Len(Name) = 0 Then Err.Raise 5, "PngDump", "the image name is empty"
-        For i = 1 To Len(Name)
-            c = AscW(Mid$(Name, i, 1))
-            If Not ((c >= 48 And c <= 57) Or (c >= 65 And c <= 90) Or (c >= 97 And c <= 122) Or c = 45 Or c = 95) Then
-                Err.Raise 5, "PngDump", "the image name """ & Name & """ must use only letters, digits, - and _"
-            End If
-        Next i
-        folder = Environ$("BUGREPRO_IMAGES")
-        If Len(folder) = 0 Then folder = App.Path
-        If Right$(folder, 1) = "\" Then folder = Left$(folder, Len(folder) - 1)
-        TargetFile = folder & "\" & Name & ".png"
-    End Function
-
-    ' Copies w by h pixels, from the DC srcDC or, when hWnd is not 0, with PrintWindow, into a
-    ' 24-bit bitmap of our own and saves it as target. Every GDI object and the GDI+ token
-    ' are released on every path, and the error is raised after that.
-    Private Sub Capture(ByVal hWnd As LongPtr, ByVal srcDC As LongPtr, ByVal w As Long, ByVal h As Long, ByVal target As String)
-        Dim token As LongPtr
-        Dim memDC As LongPtr
-        Dim dib As LongPtr
-        Dim oldBmp As LongPtr
-        Dim image As LongPtr
-        Dim bits As LongPtr
-        Dim hdr As PngBmpHeader
-        Dim gdipIn As PngGdipInput
-        Dim encoder As PngGuid
-        Dim status As Long
-        Dim failure As String
-
-        If w < 1 Or h < 1 Then failure = "the surface is " & w & " by " & h & " pixels: nothing to capture": GoTo Done
-
-        gdipIn.GdiplusVersion = 1
-        status = PngGdiplusStartup(token, gdipIn, 0)
-        If status <> 0 Then token = 0: failure = "GdiplusStartup failed, status " & status: GoTo Done
-
-        status = PngCLSIDFromString(StrPtr("{557CF406-1A04-11D3-9A73-0000F81EF32E}"), encoder)
-        If status <> 0 Then failure = "CLSIDFromString failed for the PNG encoder, HRESULT " & Hex$(status): GoTo Done
-
-        memDC = PngCreateCompatibleDC(0)
-        If memDC = 0 Then failure = "CreateCompatibleDC failed, error " & Err.LastDllError: GoTo Done
-
-        hdr.biSize = 40
-        hdr.biWidth = w
-        hdr.biHeight = h
-        hdr.biPlanes = 1
-        hdr.biBitCount = 24
-        dib = PngCreateDIBSection(memDC, hdr, 0, bits, 0, 0)
-        If dib = 0 Then failure = "CreateDIBSection failed, error " & Err.LastDllError: GoTo Done
-
-        oldBmp = PngSelectObject(memDC, dib)
-        If oldBmp = 0 Then failure = "SelectObject failed, error " & Err.LastDllError: GoTo Done
-
-        If hWnd = 0 Then
-            If PngBitBlt(memDC, 0, 0, w, h, srcDC, 0, 0, &HCC0020&) = 0 Then
-                failure = "BitBlt failed, error " & Err.LastDllError: GoTo Done
-            End If
-        Else
-            If PngPrintWindow(hWnd, memDC, 3) = 0 Then
-                failure = "PrintWindow failed, error " & Err.LastDllError: GoTo Done
-            End If
-        End If
-
-        ' GDI+ must not be given a bitmap that is selected into a device context.
-        PngSelectObject memDC, oldBmp
-        oldBmp = 0
-
-        status = PngGdipCreateBitmapFromHBITMAP(dib, 0, image)
-        If status <> 0 Then image = 0: failure = "GdipCreateBitmapFromHBITMAP failed, status " & status: GoTo Done
-
-        status = PngGdipSaveImageToFile(image, StrPtr(target), encoder, 0)
-        If status <> 0 Then failure = "GdipSaveImageToFile failed for " & target & ", status " & status
-
-Done:
-        If image <> 0 Then PngGdipDisposeImage image
-        If memDC <> 0 Then
-            If oldBmp <> 0 Then PngSelectObject memDC, oldBmp
-            If dib <> 0 Then PngDeleteObject dib
-            PngDeleteDC memDC
-        End If
-        If token <> 0 Then PngGdiplusShutdown token
-        If Len(failure) > 0 Then Err.Raise 5, "PngDump", failure
-    End Sub
-
-End Module
diff --git a/bugs/filed/circle-positive-angle-unchecked/src/Sources/Startup.twin b/bugs/filed/circle-positive-angle-unchecked/src/Sources/Startup.twin
deleted file mode 100644
index 6f0f3b872..000000000
--- a/bugs/filed/circle-positive-angle-unchecked/src/Sources/Startup.twin
+++ /dev/null
@@ -1,25 +0,0 @@
-Module Startup
-
-    Public Sub Main()
-        Dim n As Long
-        Load Form1
-        Form1.AutoRedraw = True
-        Form1.ScaleMode = vbPixels
-        Form1.BackColor = vbWhite
-        Form1.Width = Form1.Width + (260 - Form1.ScaleWidth) * Screen.TwipsPerPixelX
-        Form1.Height = Form1.Height + (130 - Form1.ScaleHeight) * Screen.TwipsPerPixelY
-        Form1.Cls
-        Debug.Print "Client area " & Form1.ScaleWidth & " x " & Form1.ScaleHeight & " pixels"
-        ' A valid pie, as the picture's context: a negative Start and End draw the radius lines.
-        Form1.Circle (65, 65), 50, vbBlue, -0.5, -2
-        ' A Start above 2 * pi: VB6 raises error 5 and draws nothing.
-        On Error Resume Next
-        Form1.Circle (195, 65), 50, vbRed, 7, 3
-        n = Err.Number
-        On Error GoTo 0
-        Debug.Print "Circle Start 7: Err " & n
-        PngDump.Surface Form1, "main"
-        Unload Form1
-    End Sub
-
-End Module
diff --git a/bugs/filed/circle-positive-angle-unchecked/vb6/Form1.frm b/bugs/filed/circle-positive-angle-unchecked/vb6/Form1.frm
deleted file mode 100644
index 69b0b2971..000000000
--- a/bugs/filed/circle-positive-angle-unchecked/vb6/Form1.frm
+++ /dev/null
@@ -1,19 +0,0 @@
-VERSION 5.00
-Begin VB.Form Form1
-   Caption         =   "Form1"
-   ClientHeight    =   1950
-   ClientLeft      =   60
-   ClientTop       =   345
-   ClientWidth     =   3900
-   LinkTopic       =   "Form1"
-   ScaleHeight     =   1950
-   ScaleWidth      =   3900
-   StartUpPosition =   3  'Windows Default
-   Visible         =   0   'False
-End
-Attribute VB_Name = "Form1"
-Attribute VB_GlobalNameSpace = False
-Attribute VB_Creatable = False
-Attribute VB_PredeclaredId = True
-Attribute VB_Exposed = False
-Option Explicit
diff --git a/bugs/filed/circle-positive-angle-unchecked/vb6/Module1.bas b/bugs/filed/circle-positive-angle-unchecked/vb6/Module1.bas
deleted file mode 100644
index 2fb9744b7..000000000
--- a/bugs/filed/circle-positive-angle-unchecked/vb6/Module1.bas
+++ /dev/null
@@ -1,34 +0,0 @@
-Attribute VB_Name = "Module1"
-Option Explicit
-
-' The VB6 side of the reproducer: node scripts/bug_repro.mjs vb6 circle-positive-angle-unchecked
-
-Sub Main()
-    Dim n As Long
-    On Error GoTo Fail
-    Open App.Path & "\out.txt" For Output As #9
-    Load Form1
-    Form1.AutoRedraw = True
-    Form1.ScaleMode = vbPixels
-    Form1.BackColor = vbWhite
-    Form1.Width = Form1.Width + (260 - Form1.ScaleWidth) * Screen.TwipsPerPixelX
-    Form1.Height = Form1.Height + (130 - Form1.ScaleHeight) * Screen.TwipsPerPixelY
-    Form1.Cls
-    Print #9, "Client area " & Form1.ScaleWidth & " x " & Form1.ScaleHeight & " pixels"
-    ' A valid pie, as the picture's context: a negative Start and End draw the radius lines.
-    Form1.Circle (65, 65), 50, vbBlue, -0.5, -2
-    ' A Start above 2 * pi: VB6 raises error 5 and draws nothing.
-    On Error Resume Next
-    Form1.Circle (195, 65), 50, vbRed, 7, 3
-    n = Err.Number
-    On Error GoTo Fail
-    Print #9, "Circle Start 7: Err " & n
-    PngDump.Surface Form1, "main"
-    Unload Form1
-    Close #9
-    Exit Sub
-Fail:
-    On Error Resume Next
-    Print #9, "unhandled error " & Err.Number & ": " & Err.Description
-    Close #9
-End Sub
diff --git a/bugs/filed/circle-positive-angle-unchecked/vb6/PngDump.bas b/bugs/filed/circle-positive-angle-unchecked/vb6/PngDump.bas
deleted file mode 100644
index 181d5e68c..000000000
--- a/bugs/filed/circle-positive-angle-unchecked/vb6/PngDump.bas
+++ /dev/null
@@ -1,200 +0,0 @@
-Attribute VB_Name = "PngDump"
-Option Explicit
-
-' Saves what a surface or a window shows as a PNG file, for a bug report that is
-' best shown by a picture. The same module, as PngDump.twin, runs in twinBASIC, so that
-' the two pictures can be put side by side (node scripts/bug_repro.mjs run, then vb6).
-'
-'     PngDump.Surface Form1, "main"       ' an object with an hDC: a Form, PictureBox, UserControl
-'     PngDump.Window Text1.hWnd, "text"   ' a control with no hDC; its client area
-'
-' The file is <folder>\<Name>.png. The folder is the BUGREPRO_IMAGES environment
-' variable, which bug_repro.mjs sets, or else App.Path. Name uses letters, digits,
-' - and _. Any failure raises error 5, whose Description says which call failed.
-'
-' The pixels are copied with BitBlt (or PrintWindow) into a bitmap of this module's own
-' and saved with GDI+, so the picture is what was drawn, not what the object's Image
-' property or SavePicture would make of it.
-'
-' The Declares are aliased to Png... names, so that a reproducer's own BitBlt or
-' SelectObject cannot collide with them.
-
-Private Type PngGuid
-    Data1 As Long
-    Data2 As Integer
-    Data3 As Integer
-    Data4(0 To 7) As Byte
-End Type
-
-Private Type PngGdipInput
-    GdiplusVersion As Long
-    DebugEventCallback As Long
-    SuppressBackgroundThread As Long
-    SuppressExternalCodecs As Long
-End Type
-
-Private Type PngRect
-    Left As Long
-    Top As Long
-    Right As Long
-    Bottom As Long
-End Type
-
-Private Type PngBmpHeader
-    biSize As Long
-    biWidth As Long
-    biHeight As Long
-    biPlanes As Integer
-    biBitCount As Integer
-    biCompression As Long
-    biSizeImage As Long
-    biXPelsPerMeter As Long
-    biYPelsPerMeter As Long
-    biClrUsed As Long
-    biClrImportant As Long
-End Type
-
-Private Declare Function PngGdiplusStartup Lib "gdiplus" Alias "GdiplusStartup" ( _
-    ByRef token As Long, ByRef startInput As PngGdipInput, ByVal startOutput As Long) As Long
-Private Declare Sub PngGdiplusShutdown Lib "gdiplus" Alias "GdiplusShutdown" ( _
-    ByVal token As Long)
-Private Declare Function PngGdipCreateBitmapFromHBITMAP Lib "gdiplus" Alias "GdipCreateBitmapFromHBITMAP" ( _
-    ByVal hbm As Long, ByVal hpal As Long, ByRef bitmap As Long) As Long
-Private Declare Function PngGdipSaveImageToFile Lib "gdiplus" Alias "GdipSaveImageToFile" ( _
-    ByVal image As Long, ByVal fileName As Long, ByRef clsidEncoder As PngGuid, ByVal encoderParams As Long) As Long
-Private Declare Function PngGdipDisposeImage Lib "gdiplus" Alias "GdipDisposeImage" ( _
-    ByVal image As Long) As Long
-Private Declare Function PngCLSIDFromString Lib "ole32" Alias "CLSIDFromString" ( _
-    ByVal lpsz As Long, ByRef pclsid As PngGuid) As Long
-Private Declare Function PngCreateCompatibleDC Lib "gdi32" Alias "CreateCompatibleDC" ( _
-    ByVal hdc As Long) As Long
-Private Declare Function PngCreateDIBSection Lib "gdi32" Alias "CreateDIBSection" ( _
-    ByVal hdc As Long, ByRef pbmi As PngBmpHeader, ByVal usage As Long, ByRef ppvBits As Long, _
-    ByVal hSection As Long, ByVal offset As Long) As Long
-Private Declare Function PngSelectObject Lib "gdi32" Alias "SelectObject" ( _
-    ByVal hdc As Long, ByVal hObject As Long) As Long
-Private Declare Function PngDeleteObject Lib "gdi32" Alias "DeleteObject" ( _
-    ByVal hObject As Long) As Long
-Private Declare Function PngDeleteDC Lib "gdi32" Alias "DeleteDC" ( _
-    ByVal hdc As Long) As Long
-Private Declare Function PngBitBlt Lib "gdi32" Alias "BitBlt" ( _
-    ByVal hdcDest As Long, ByVal xDest As Long, ByVal yDest As Long, ByVal cx As Long, ByVal cy As Long, _
-    ByVal hdcSrc As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal rop As Long) As Long
-Private Declare Function PngGetClientRect Lib "user32" Alias "GetClientRect" ( _
-    ByVal hwnd As Long, ByRef rc As PngRect) As Long
-Private Declare Function PngPrintWindow Lib "user32" Alias "PrintWindow" ( _
-    ByVal hwnd As Long, ByVal hdcBlt As Long, ByVal flags As Long) As Long
-
-' Saves the pixels an object with an hDC has drawn, <Name>.png.
-Public Sub Surface(ByVal Obj As Object, ByVal Name As String)
-    Dim target As String
-    Dim w As Long
-    Dim h As Long
-    Dim src As Long
-    target = TargetFile(Name)
-    w = CLng(Obj.ScaleX(Obj.ScaleWidth, Obj.ScaleMode, vbPixels))
-    h = CLng(Obj.ScaleY(Obj.ScaleHeight, Obj.ScaleMode, vbPixels))
-    src = CLng(Obj.hDC)
-    Capture 0, src, w, h, target
-End Sub
-
-' Saves the client area of a window, <Name>.png: for a control with no hDC.
-Public Sub Window(ByVal hWnd As Long, ByVal Name As String)
-    Dim target As String
-    Dim rc As PngRect
-    target = TargetFile(Name)
-    If hWnd = 0 Then Err.Raise 5, "PngDump", "the window handle is 0"
-    If PngGetClientRect(hWnd, rc) = 0 Then
-        Err.Raise 5, "PngDump", "GetClientRect failed, error " & Err.LastDllError
-    End If
-    Capture hWnd, 0, rc.Right - rc.Left, rc.Bottom - rc.Top, target
-End Sub
-
-' The file's path, or error 5 for a name that is empty or uses a character outside
-' letters, digits, - and _.
-Private Function TargetFile(ByVal Name As String) As String
-    Dim i As Long
-    Dim c As Long
-    Dim folder As String
-    If Len(Name) = 0 Then Err.Raise 5, "PngDump", "the image name is empty"
-    For i = 1 To Len(Name)
-        c = AscW(Mid$(Name, i, 1))
-        If Not ((c >= 48 And c <= 57) Or (c >= 65 And c <= 90) Or (c >= 97 And c <= 122) Or c = 45 Or c = 95) Then
-            Err.Raise 5, "PngDump", "the image name """ & Name & """ must use only letters, digits, - and _"
-        End If
-    Next i
-    folder = Environ$("BUGREPRO_IMAGES")
-    If Len(folder) = 0 Then folder = App.Path
-    If Right$(folder, 1) = "\" Then folder = Left$(folder, Len(folder) - 1)
-    TargetFile = folder & "\" & Name & ".png"
-End Function
-
-' Copies w by h pixels, from the DC srcDC or, when hWnd is not 0, with PrintWindow, into a
-' 24-bit bitmap of our own and saves it as target. Every GDI object and the GDI+ token
-' are released on every path, and the error is raised after that.
-Private Sub Capture(ByVal hWnd As Long, ByVal srcDC As Long, ByVal w As Long, ByVal h As Long, ByVal target As String)
-    Dim token As Long
-    Dim memDC As Long
-    Dim dib As Long
-    Dim oldBmp As Long
-    Dim image As Long
-    Dim bits As Long
-    Dim hdr As PngBmpHeader
-    Dim gdipIn As PngGdipInput
-    Dim encoder As PngGuid
-    Dim status As Long
-    Dim failure As String
-
-    If w < 1 Or h < 1 Then failure = "the surface is " & w & " by " & h & " pixels: nothing to capture": GoTo Done
-
-    gdipIn.GdiplusVersion = 1
-    status = PngGdiplusStartup(token, gdipIn, 0)
-    If status <> 0 Then token = 0: failure = "GdiplusStartup failed, status " & status: GoTo Done
-
-    status = PngCLSIDFromString(StrPtr("{557CF406-1A04-11D3-9A73-0000F81EF32E}"), encoder)
-    If status <> 0 Then failure = "CLSIDFromString failed for the PNG encoder, HRESULT " & Hex$(status): GoTo Done
-
-    memDC = PngCreateCompatibleDC(0)
-    If memDC = 0 Then failure = "CreateCompatibleDC failed, error " & Err.LastDllError: GoTo Done
-
-    hdr.biSize = 40
-    hdr.biWidth = w
-    hdr.biHeight = h
-    hdr.biPlanes = 1
-    hdr.biBitCount = 24
-    dib = PngCreateDIBSection(memDC, hdr, 0, bits, 0, 0)
-    If dib = 0 Then failure = "CreateDIBSection failed, error " & Err.LastDllError: GoTo Done
-
-    oldBmp = PngSelectObject(memDC, dib)
-    If oldBmp = 0 Then failure = "SelectObject failed, error " & Err.LastDllError: GoTo Done
-
-    If hWnd = 0 Then
-        If PngBitBlt(memDC, 0, 0, w, h, srcDC, 0, 0, &HCC0020) = 0 Then
-            failure = "BitBlt failed, error " & Err.LastDllError: GoTo Done
-        End If
-    Else
-        If PngPrintWindow(hWnd, memDC, 3) = 0 Then
-            failure = "PrintWindow failed, error " & Err.LastDllError: GoTo Done
-        End If
-    End If
-
-    ' GDI+ must not be given a bitmap that is selected into a device context.
-    PngSelectObject memDC, oldBmp
-    oldBmp = 0
-
-    status = PngGdipCreateBitmapFromHBITMAP(dib, 0, image)
-    If status <> 0 Then image = 0: failure = "GdipCreateBitmapFromHBITMAP failed, status " & status: GoTo Done
-
-    status = PngGdipSaveImageToFile(image, StrPtr(target), encoder, 0)
-    If status <> 0 Then failure = "GdipSaveImageToFile failed for " & target & ", status " & status
-
-Done:
-    If image <> 0 Then PngGdipDisposeImage image
-    If memDC <> 0 Then
-        If oldBmp <> 0 Then PngSelectObject memDC, oldBmp
-        If dib <> 0 Then PngDeleteObject dib
-        PngDeleteDC memDC
-    End If
-    If token <> 0 Then PngGdiplusShutdown token
-    If Len(failure) > 0 Then Err.Raise 5, "PngDump", failure
-End Sub
diff --git a/bugs/filed/circle-positive-angle-unchecked/vb6/Probe.vbp b/bugs/filed/circle-positive-angle-unchecked/vb6/Probe.vbp
deleted file mode 100644
index 58915ee0b..000000000
--- a/bugs/filed/circle-positive-angle-unchecked/vb6/Probe.vbp
+++ /dev/null
@@ -1,9 +0,0 @@
-Type=Exe
-Form=Form1.frm
-Module=Module1; Module1.bas
-Module=PngDump; PngDump.bas
-Startup="Sub Main"
-ExeName32="Probe.exe"
-Name="Probe"
-CompilationType=0
-OptimizationType=0
diff --git a/bugs/filed/crash-placeholder-interface/REPORT.md b/bugs/filed/crash-placeholder-interface/REPORT.md
deleted file mode 100644
index aa7620cec..000000000
--- a/bugs/filed/crash-placeholder-interface/REPORT.md
+++ /dev/null
@@ -1,37 +0,0 @@
-Filed as [twinbasic/twinbasic#2453](https://github.com/twinbasic/twinbasic/issues/2453).
-
-## Compiler crashes on an `Interface` named by an angle-bracket placeholder that has an `Extends` clause
-
-**Describe the bug**
-A source file holding an `Interface` whose name is an angle-bracket placeholder and that has an `Extends` clause crashes the compiler while it parses the file. The DEBUG CONSOLE shows `NATIVE EXCEPTION: ACCESS_VIOLATION {no-basic-code}` with `>>> thread 0004: ParsingFileStart, <that file>`, then `restarting from MEMORY`, three times over, and then the IDE gives up. The input is not real code (it is a syntax skeleton, the shape the documentation uses to show where an attribute goes), but a parser given nonsense should report a diagnostic, and this one dereferences something instead.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `crash-placeholder-interface.twinproj` (attached as `crash-placeholder-interface.zip`). Its one source file, `Placeholder.twin`, is the whole reproduction:
-   ```
-   Interface <name> Extends <base-interface>
-   End Interface
-   ```
-2. See the compiler crash with `NATIVE EXCEPTION: ACCESS_VIOLATION {no-basic-code}` in the DEBUG CONSOLE, restart from memory three times, and then stop restarting.
-
-It takes a placeholder name and an `Extends` clause, and what the clause names does not matter:
-
-| source | result |
-|---|---|
-| `Interface <name>` + `End Interface` | TB5182 Syntax error, no crash |
-| `Interface IFoo Extends <base-interface>` + `End Interface` | TB5182 + TB5079 + TB5127, no crash |
-| `Interface <name> Extends <base-interface>` + `End Interface` | **crash** |
-| `Interface <name> Extends IBase` + `End Interface`, no `IBase` anywhere | **crash** |
-| the same, with `Interface IBase` or `Class IBase` declared in another file | **crash** |
-
-**Expected behavior**
-A syntax error (TB5182, as for the same line without the `Extends` clause), not a crash.
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-Also on BETA 983, at `twinBASIC_win32.dll+00141F7A`. Severity: crash. It takes the compiler down, three restarts, then the IDE gives up. A crash in a batch of projects costs the whole batch its result, so a tool that compiles many files at once has to isolate the file that does it. An earlier version of this report said the crash needs a placeholder in both positions, the name and the base; the last two rows of the table, each measured with a project of its own, show the base can be a real name or missing entirely.
-
-<!-- Reproducer: bugs/crash-placeholder-interface/ (mode compile, expects tbbuild exit 4). Found by pointing scripts/check_examples.mjs at the documentation's own code samples: the skeleton is one of the `tb` fences under docs/ (the one in Reference/Attributes.md that shows where an attribute goes); that tool isolates the sample on exit code 4. The table rows were measured on 2026-09-24, each in a project of its own; the crash reproduced on 995 and 983 with bug_repro verify. -->
diff --git a/bugs/filed/crash-placeholder-interface/crash-placeholder-interface.twinproj b/bugs/filed/crash-placeholder-interface/crash-placeholder-interface.twinproj
deleted file mode 100644
index 9ac459e8c7012032a2b4f86be7de7b25a3756017..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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diff --git a/bugs/filed/crash-placeholder-interface/repro.json b/bugs/filed/crash-placeholder-interface/repro.json
deleted file mode 100644
index facbed9b0..000000000
--- a/bugs/filed/crash-placeholder-interface/repro.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "mode": "compile",
-  "expect": {
-    "exit": 4
-  },
-  "issue": 2453
-}
diff --git a/bugs/filed/crash-placeholder-interface/src/Settings b/bugs/filed/crash-placeholder-interface/src/Settings
deleted file mode 100644
index 75407d390..000000000
--- a/bugs/filed/crash-placeholder-interface/src/Settings
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "CrashPlaceholderInterface",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard EXE",
-	"project.description": "Reproduces: Compiler crashes on an `Interface` named by an angle-bracket placeholder that has an `Extends` clause",
-	"project.exportPathIsV2": true,
-	"project.id": "{51505D43-8F7F-448C-B5F9-370DF2631F41}",
-	"project.name": "CrashPlaceholderInterface",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"symbolId": "stdole",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "VB",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 31
-		},
-		{
-			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "AppGlobalClassProject",
-			"versionBuild": 0,
-			"versionMajor": 1,
-			"versionMinor": 0,
-			"versionRevision": 0
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.startupObject": "Sub Main",
-	"project.warnings": {
-		"errors": [],
-		"hints": [],
-		"ignored": [],
-		"info": [],
-		"warnings": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/crash-placeholder-interface/src/Sources/Placeholder.twin b/bugs/filed/crash-placeholder-interface/src/Sources/Placeholder.twin
deleted file mode 100644
index f224906cf..000000000
--- a/bugs/filed/crash-placeholder-interface/src/Sources/Placeholder.twin
+++ /dev/null
@@ -1,3 +0,0 @@
-' An Interface named by an angle-bracket placeholder, with an Extends clause: the compiler crashes while parsing this file.
-Interface <name> Extends <base-interface>
-End Interface
diff --git a/bugs/filed/crash-placeholder-interface/src/Sources/Startup.twin b/bugs/filed/crash-placeholder-interface/src/Sources/Startup.twin
deleted file mode 100644
index 20233b3a9..000000000
--- a/bugs/filed/crash-placeholder-interface/src/Sources/Startup.twin
+++ /dev/null
@@ -1,6 +0,0 @@
-Module Startup
-
-    Public Sub Main()
-    End Sub
-
-End Module
diff --git a/bugs/filed/enum-connection-points-contract/REPORT.md b/bugs/filed/enum-connection-points-contract/REPORT.md
deleted file mode 100644
index 06d0ba8fb..000000000
--- a/bugs/filed/enum-connection-points-contract/REPORT.md
+++ /dev/null
@@ -1,44 +0,0 @@
-Filed as [twinbasic/twinbasic#2462](https://github.com/twinbasic/twinbasic/issues/2462).
-
-## The `IEnumConnectionPoints` of a twinBASIC class raises `E_FAIL` at the end of the list, and `Skip` and `Clone` raise `E_NOTIMPL`
-
-**Describe the bug**
-The enumerator that `IConnectionPointContainer.EnumConnectionPoints` returns for a class with an `Event` does not follow the `IEnum` contract. `Next` raises `E_FAIL` when no item is left, and when more items are asked for than remain, where `S_FALSE` is expected. `Skip` and `Clone` both raise `E_NOTIMPL`. `Reset`, and `Next` with exactly one item left, work.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `enum-connection-points-contract.twinproj` (attached as `enum-connection-points-contract.zip`). Its one source file, `Startup.twin`, declares the project's own copies of `IConnectionPointContainer` and `IEnumConnectionPoints` (`stdole` has neither) and a class with one event. `Sub Main` gets the enumerator and calls it with `On Error Resume Next`:
-   ```
-   points.Next 1, item, fetched      ' the one point
-   points.Next 1, item, fetched      ' at the end
-   points.Reset
-   points.Next 2, item, fetched      ' two asked for, one left
-   points.Reset
-   points.Skip 1
-   Dim copy As IEnumConnectionPoints = points.Clone()
-   ```
-2. Run the project in the IDE (F5).
-3. See in the DEBUG CONSOLE:
-   ```
-   Next 1, one point: error=0 LastHresult=0 fetched=1
-   Next 1, at the end: error=80004005 LastHresult=0 fetched=0
-   Next 2, one point: error=80004005 LastHresult=0 fetched=0
-   Skip 1: error=80004001 LastHresult=0 fetched=0
-   Clone: error=80004001 LastHresult=0 fetched=0
-   ```
-
-**Expected behavior**
-The enumerator follows the contract, as the Windows SDK pages state it. [IEnumConnectionPoints::Next](https://learn.microsoft.com/en-us/windows/win32/api/ocidl/nf-ocidl-ienumconnectionpoints-next): "If there are fewer than the requested number of items left in the sequence, this method retrieves the remaining elements", *pcFetched* is the number retrieved, and "If the method retrieves the number of items requested, the return value is S_OK. Otherwise, it is S_FALSE." So the second call returns `S_FALSE` with 0 items and the third returns `S_FALSE` with 1. [Skip](https://learn.microsoft.com/en-us/windows/win32/api/ocidl/nf-ocidl-ienumconnectionpoints-skip) returns `S_OK`, or `S_FALSE` when it could not skip as many as asked. [Clone](https://learn.microsoft.com/en-us/windows/win32/api/ocidl/nf-ocidl-ienumconnectionpoints-clone) returns a new enumerator with the same state, and lists `E_INVALIDARG`, `E_OUTOFMEMORY`, `E_UNEXPECTED` and `S_OK`, not `E_NOTIMPL`. The sibling `IEnumConnections` of the same connection points does return `S_FALSE` at its end and implements `Skip` and `Clone`. VB6 follows the contract. For a VB6 class with one `Event`, the same calls through the vtable return: `Next 1` with one point: `S_OK`, fetched=1; `Next 1` at the end: `S_FALSE` (`00000001`), fetched=0; after `Reset`, `Next 2` with one point: `S_FALSE`, fetched=1; `Skip 1`: `S_OK`; `Clone`: `S_OK` and a new enumerator. No call fails.
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-Severity: low for twinBASIC code, which knows there is one connection point, but a client written for the contract, such as a C++ loop that runs while `Next` returns `S_OK` and treats any failure as fatal, gets an error where it expects the end of the list.
-
-What was tried: a class with one event has exactly one connection point, so `Next 1` returning it and `Reset` followed by another `Next` both work. Reading `LastHresult` after the failing call gives 0, because the call raised its error instead of returning a success code. The same calls from a probe that passed raw pointers instead of typed variables gave the same codes.
-
-VB6 comparison: the VB6 project is attached as `enum-connection-points-contract-vb6.zip`. VB6 cannot declare these interfaces, so it calls them through the vtable with `DispCallFunc` on raw pointers. It was built with VB6 SP6 and run, and writes `out.txt` beside the exe. Its output for this entry's calls is `Next 1, one point: hr=00000000 fetched=1`, `Next 1, at the end: hr=00000001 fetched=0`, `Next 2, one point: hr=00000001 fetched=1`, `Skip 1: hr=00000000`, `Clone: hr=00000000`, against twinBASIC's `80004005`, `80004005`, `80004001` and `80004001` for the last four.
-
-<!-- Reproducer: bugs/enum-connection-points-contract/ (mode run, expects tbrun exit 0 and the four error codes above); verified on 995. Stated in docs/Reference/COM-Interfaces/IConnectionPoint.md, section "The enumerators" (the IEnumConnectionPoints column of the table, and the closing paragraph), and in the last example, whose comment says Next raises E_FAIL: when fixed, change both, and the sentence in the declarations section that says the enumerators of the page return one item per call whatever the count asked for. -->
diff --git a/bugs/filed/enum-connection-points-contract/enum-connection-points-contract.twinproj b/bugs/filed/enum-connection-points-contract/enum-connection-points-contract.twinproj
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diff --git a/bugs/filed/enum-connection-points-contract/repro.json b/bugs/filed/enum-connection-points-contract/repro.json
deleted file mode 100644
index 7a974f1d6..000000000
--- a/bugs/filed/enum-connection-points-contract/repro.json
+++ /dev/null
@@ -1,13 +0,0 @@
-{
-  "mode": "run",
-  "expect": {
-    "exit": 0,
-    "output": [
-      "^Next 1, at the end: error=80004005 ",
-      "^Next 2, one point: error=80004005 ",
-      "^Skip 1: error=80004001 ",
-      "^Clone: error=80004001 "
-    ]
-  },
-  "issue": 2462
-}
diff --git a/bugs/filed/enum-connection-points-contract/src/Settings b/bugs/filed/enum-connection-points-contract/src/Settings
deleted file mode 100644
index cf6fae592..000000000
--- a/bugs/filed/enum-connection-points-contract/src/Settings
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "EnumConnectionPointsContract",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard EXE",
-	"project.description": "Reproduces: t",
-	"project.exportPathIsV2": true,
-	"project.id": "{33636B5C-756D-47E6-81D5-B030D3D8F9B9}",
-	"project.name": "EnumConnectionPointsContract",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"symbolId": "stdole",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "VB",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 31
-		},
-		{
-			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "AppGlobalClassProject",
-			"versionBuild": 0,
-			"versionMajor": 1,
-			"versionMinor": 0,
-			"versionRevision": 0
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.startupObject": "Sub Main",
-	"project.warnings": {
-		"errors": [],
-		"hints": [],
-		"ignored": [],
-		"info": [],
-		"warnings": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/enum-connection-points-contract/src/Sources/Startup.twin b/bugs/filed/enum-connection-points-contract/src/Sources/Startup.twin
deleted file mode 100644
index 494a12845..000000000
--- a/bugs/filed/enum-connection-points-contract/src/Sources/Startup.twin
+++ /dev/null
@@ -1,48 +0,0 @@
-' The IEnumConnectionPoints that a class with an Event returns:
-' Next raises E_FAIL at the end of the list (S_FALSE expected), and Skip and Clone raise E_NOTIMPL.
-[InterfaceId("B196B284-BAB4-101A-B69C-00AA00341D07")]
-Private Interface IConnectionPointContainer Extends stdole.IUnknown
-    Function EnumConnectionPoints() As IEnumConnectionPoints
-End Interface
-
-[InterfaceId("B196B285-BAB4-101A-B69C-00AA00341D07")]
-Private Interface IEnumConnectionPoints Extends stdole.IUnknown
-    Sub Next(ByVal cConnections As Long, ByRef ppCP As stdole.IUnknown, ByRef pcFetched As Long)
-    Sub Skip(ByVal cConnections As Long)
-    Sub Reset()
-    Function Clone() As IEnumConnectionPoints
-End Interface
-
-Private Class Source
-    Public Event Ping()
-End Class
-
-Module Startup
-
-    Private Sub Report(ByVal What As String, ByVal Fetched As Long)
-        Debug.Print What & ": error=" & Hex$(Err.Number) & " LastHresult=" & Hex$(Err.LastHresult) & " fetched=" & Fetched
-        Err.Clear
-    End Sub
-
-    Public Sub Main()
-        Dim src As New Source
-        Dim container As IConnectionPointContainer = src
-        Dim points As IEnumConnectionPoints = container.EnumConnectionPoints()
-        Dim item As stdole.IUnknown, fetched As Long
-        On Error Resume Next
-
-        points.Next 1, item, fetched
-        Report "Next 1, one point", fetched
-        points.Next 1, item, fetched
-        Report "Next 1, at the end", fetched
-        points.Reset
-        points.Next 2, item, fetched
-        Report "Next 2, one point", fetched
-        points.Reset
-        points.Skip 1
-        Report "Skip 1", fetched
-        Dim copy As IEnumConnectionPoints = points.Clone()
-        Report "Clone", fetched
-    End Sub
-
-End Module
diff --git a/bugs/filed/enum-connection-points-contract/vb6/Holder.cls b/bugs/filed/enum-connection-points-contract/vb6/Holder.cls
deleted file mode 100644
index e2db21fa3..000000000
--- a/bugs/filed/enum-connection-points-contract/vb6/Holder.cls
+++ /dev/null
@@ -1,20 +0,0 @@
-VERSION 1.0 CLASS
-BEGIN
-  MultiUse = -1  'True
-END
-Attribute VB_Name = "Holder"
-Attribute VB_GlobalNameSpace = False
-Attribute VB_Creatable = False
-Attribute VB_PredeclaredId = False
-Attribute VB_Exposed = False
-Option Explicit
-
-' Each Holder with a WithEvents variable set to the source is one connection.
-Private WithEvents Src As Source
-
-Public Sub Attach(ByVal Target As Source)
-    Set Src = Target
-End Sub
-
-Private Sub Src_Ping()
-End Sub
diff --git a/bugs/filed/enum-connection-points-contract/vb6/Probe.vbp b/bugs/filed/enum-connection-points-contract/vb6/Probe.vbp
deleted file mode 100644
index f4a01c6eb..000000000
--- a/bugs/filed/enum-connection-points-contract/vb6/Probe.vbp
+++ /dev/null
@@ -1,9 +0,0 @@
-Type=Exe
-Module=ProbeMain; ProbeMain.bas
-Class=Source; Source.cls
-Class=Holder; Holder.cls
-Startup="Sub Main"
-ExeName32="Probe.exe"
-Name="Probe"
-CompilationType=0
-OptimizationType=0
diff --git a/bugs/filed/enum-connection-points-contract/vb6/ProbeMain.bas b/bugs/filed/enum-connection-points-contract/vb6/ProbeMain.bas
deleted file mode 100644
index 6e7c357bc..000000000
--- a/bugs/filed/enum-connection-points-contract/vb6/ProbeMain.bas
+++ /dev/null
@@ -1,218 +0,0 @@
-Attribute VB_Name = "ProbeMain"
-Option Explicit
-
-' The VB6 counterpart of bugs/enum-connections-one-item and bugs/enum-connection-points-contract.
-' VB6 cannot declare IConnectionPointContainer, IEnumConnectionPoints, IConnectionPoint or
-' IEnumConnections, so each call goes through the vtable with DispCallFunc on raw pointers.
-' Vtable slots: IUnknown 0..2; IConnectionPointContainer.EnumConnectionPoints 3;
-' IEnumConnectionPoints / IEnumConnections Next 3, Skip 4, Reset 5, Clone 6;
-' IConnectionPoint.EnumConnections 7. Output goes to out.txt beside the exe.
-
-Private Declare Function DispCallFunc Lib "oleaut32" (ByVal pvInstance As Long, ByVal oVft As Long, ByVal cc As Long, ByVal vtReturn As Integer, ByVal cActuals As Long, prgvt As Integer, prgpvarg As Long, pvargResult As Variant) As Long
-Private Declare Function IIDFromString Lib "ole32" (ByVal lpsz As Long, lpiid As GUID) As Long
-
-Private Type GUID
-    Data1 As Long
-    Data2 As Integer
-    Data3 As Integer
-    Data4(0 To 7) As Byte
-End Type
-
-Private Type CONNECTDATA
-    pUnk As Long
-    dwCookie As Long
-End Type
-
-Private Const CC_STDCALL As Long = 4
-Private Const VT_I4 As Integer = 3
-
-Private Items(0 To 3) As CONNECTDATA
-Private Points(0 To 3) As Long
-
-Sub Main()
-    On Error GoTo Fail
-    Open App.Path & "\out.txt" For Output As #9
-    Run
-    Close #9
-    Exit Sub
-Fail:
-    On Error Resume Next
-    Print #9, "unhandled error " & Err.Number & ": " & Err.Description
-    Close #9
-End Sub
-
-Private Sub Emit(ByVal s As String)
-    Print #9, s
-End Sub
-
-Private Function H(ByVal v As Long) As String
-    H = Right$("00000000" & Hex$(v), 8)
-End Function
-
-' Calls vtable slot Slot of the object at pObj with up to four Long arguments; returns the HRESULT.
-Private Function VCall(ByVal pObj As Long, ByVal Slot As Long, ParamArray A() As Variant) As Long
-    Dim n As Long, i As Long
-    Dim vars(0 To 3) As Variant
-    Dim vts(0 To 3) As Integer
-    Dim ptrs(0 To 3) As Long
-    Dim res As Variant
-    Dim rc As Long
-    n = UBound(A) + 1
-    For i = 0 To n - 1
-        vars(i) = CLng(A(i))
-        vts(i) = VT_I4
-        ptrs(i) = VarPtr(vars(i))
-    Next i
-    res = Empty
-    rc = DispCallFunc(pObj, Slot * 4, CC_STDCALL, VT_I4, n, vts(0), ptrs(0), res)
-    If rc <> 0 Then
-        VCall = rc
-    Else
-        VCall = CLng(res)
-    End If
-End Function
-
-Private Sub ReleasePtr(ByVal p As Long)
-    If p <> 0 Then VCall p, 2
-End Sub
-
-Private Sub Run()
-    Dim src As Source
-    Dim a As Holder, b As Holder
-    Dim iid As GUID
-    Dim pCPC As Long, pEnumPts As Long, pPoint As Long
-    Dim hr As Long
-
-    Set src = New Source
-    Set a = New Holder
-    Set b = New Holder
-    a.Attach src
-    b.Attach src
-
-    hr = IIDFromString(StrPtr("{B196B284-BAB4-101A-B69C-00AA00341D07}"), iid)
-    Emit "IIDFromString: hr=" & H(hr)
-    hr = VCall(ObjPtr(src), 0, VarPtr(iid), VarPtr(pCPC))
-    Emit "QueryInterface(IConnectionPointContainer): hr=" & H(hr) & " ptr<>0: " & (pCPC <> 0)
-    If pCPC = 0 Then Exit Sub
-
-    ' --- IEnumConnectionPoints: the sequence of enum-connection-points-contract ---
-    hr = VCall(pCPC, 3, VarPtr(pEnumPts))
-    Emit "EnumConnectionPoints: hr=" & H(hr)
-    If pEnumPts = 0 Then Exit Sub
-    PointsNext pEnumPts, 1, "Next 1, one point"
-    PointsNext pEnumPts, 1, "Next 1, at the end"
-    Emit "Reset: hr=" & H(VCall(pEnumPts, 5))
-    PointsNext pEnumPts, 2, "Next 2, one point"
-    Emit "Reset: hr=" & H(VCall(pEnumPts, 5))
-    Emit "Skip 1: hr=" & H(VCall(pEnumPts, 4, 1))
-    Dim pCopy As Long
-    hr = VCall(pEnumPts, 6, VarPtr(pCopy))
-    Emit "Clone: hr=" & H(hr) & " ptr<>0: " & (pCopy <> 0)
-    ReleasePtr pCopy
-    ReleasePtr pEnumPts
-
-    ' --- IEnumConnections: the sequence of enum-connections-one-item ---
-    hr = VCall(pCPC, 3, VarPtr(pEnumPts))
-    Emit "EnumConnectionPoints (again): hr=" & H(hr)
-    PointsNext pEnumPts, 1, "Next 1, one point (to get the point)"
-    pPoint = Points(0)
-    Points(0) = 0
-    ReleasePtr pEnumPts
-    If pPoint = 0 Then Exit Sub
-
-    Dim pEnum As Long, pClone As Long
-
-    pEnum = NewConnEnum(pPoint)
-    ConnNext pEnum, 2, "Next 2, two connections"
-    ConnNext pEnum, 1, "Next 1, after Next 2 took both"
-    ReleasePtr pEnum
-
-    pEnum = NewConnEnum(pPoint)
-    ConnNext pEnum, 3, "Next 3, two connections"
-    ReleasePtr pEnum
-
-    pEnum = NewConnEnum(pPoint)
-    ConnNext pEnum, 1, "Next 1, first"
-    ConnNext pEnum, 1, "Next 1, second"
-    ConnNext pEnum, 1, "Next 1, at the end"
-    Emit "Reset: hr=" & H(VCall(pEnum, 5))
-    ConnNext pEnum, 2, "Next 2, after Reset"
-    ReleasePtr pEnum
-
-    pEnum = NewConnEnum(pPoint)
-    Emit "Skip 1: hr=" & H(VCall(pEnum, 4, 1))
-    ConnNext pEnum, 1, "Next 1, after Skip 1"
-    ReleasePtr pEnum
-
-    pEnum = NewConnEnum(pPoint)
-    ConnNext pEnum, 1, "Next 1, before Clone"
-    pClone = 0
-    hr = VCall(pEnum, 6, VarPtr(pClone))
-    Emit "Clone: hr=" & H(hr) & " ptr<>0: " & (pClone <> 0)
-    If pClone <> 0 Then ConnNext pClone, 2, "Next 2 on the clone, one left"
-    ReleasePtr pClone
-    ReleasePtr pEnum
-
-    pEnum = NewConnEnum(pPoint)
-    ClearItems
-    hr = VCall(pEnum, 3, 1, VarPtr(Items(0)), 0)
-    Emit "Next 1 with null pcFetched: hr=" & H(hr) & " cookie=" & Items(0).dwCookie
-    ReleaseItems
-    ReleasePtr pEnum
-
-    ReleasePtr pPoint
-    ReleasePtr pCPC
-End Sub
-
-Private Sub PointsNext(ByVal pEnumPts As Long, ByVal Count As Long, ByVal Label As String)
-    Dim i As Long, hr As Long, fetched As Long
-    For i = 0 To 3
-        Points(i) = 0
-    Next i
-    fetched = -1
-    hr = VCall(pEnumPts, 3, Count, VarPtr(Points(0)), VarPtr(fetched))
-    Emit Label & ": hr=" & H(hr) & " fetched=" & fetched
-    ' Points(0) stays set for the caller that wants the point; release every other pointer.
-    Dim keep As Long
-    If InStr(Label, "to get the point") > 0 Then keep = 1 Else keep = 0
-    For i = keep To 3
-        ReleasePtr Points(i)
-        Points(i) = 0
-    Next i
-End Sub
-
-Private Function NewConnEnum(ByVal pPoint As Long) As Long
-    Dim hr As Long, p As Long
-    hr = VCall(pPoint, 7, VarPtr(p))
-    If hr <> 0 Then Emit "EnumConnections: hr=" & H(hr)
-    NewConnEnum = p
-End Function
-
-Private Sub ClearItems()
-    Dim i As Long
-    For i = 0 To 3
-        Items(i).pUnk = 0
-        Items(i).dwCookie = 0
-    Next i
-End Sub
-
-Private Sub ReleaseItems()
-    Dim i As Long
-    For i = 0 To 3
-        ReleasePtr Items(i).pUnk
-        Items(i).pUnk = 0
-    Next i
-End Sub
-
-Private Sub ConnNext(ByVal pEnum As Long, ByVal Count As Long, ByVal Label As String)
-    Dim hr As Long, fetched As Long, i As Long, s As String
-    ClearItems
-    fetched = -1
-    hr = VCall(pEnum, 3, Count, VarPtr(Items(0)), VarPtr(fetched))
-    s = ""
-    For i = 0 To Count - 1
-        s = s & " " & Items(i).dwCookie
-    Next i
-    Emit Label & ": hr=" & H(hr) & " fetched=" & fetched & ", cookies" & s
-    ReleaseItems
-End Sub
diff --git a/bugs/filed/enum-connection-points-contract/vb6/Source.cls b/bugs/filed/enum-connection-points-contract/vb6/Source.cls
deleted file mode 100644
index 59f1b368c..000000000
--- a/bugs/filed/enum-connection-points-contract/vb6/Source.cls
+++ /dev/null
@@ -1,13 +0,0 @@
-VERSION 1.0 CLASS
-BEGIN
-  MultiUse = -1  'True
-END
-Attribute VB_Name = "Source"
-Attribute VB_GlobalNameSpace = False
-Attribute VB_Creatable = False
-Attribute VB_PredeclaredId = False
-Attribute VB_Exposed = False
-Option Explicit
-
-' A class with one event, so one connection point.
-Public Event Ping()
diff --git a/bugs/filed/enum-connections-one-item/REPORT.md b/bugs/filed/enum-connections-one-item/REPORT.md
deleted file mode 100644
index 3e2846d9b..000000000
--- a/bugs/filed/enum-connections-one-item/REPORT.md
+++ /dev/null
@@ -1,34 +0,0 @@
-Filed as [twinbasic/twinbasic#2461](https://github.com/twinbasic/twinbasic/issues/2461).
-
-## `IEnumConnections.Next` returns one item when asked for two with two connections present
-
-**Describe the bug**
-The enumerator that `IConnectionPoint.EnumConnections` returns for a twinBASIC class's connection point returns at most one item per `Next` call, whatever the count asked for. With two sinks connected, `Next 2` fills one `CONNECTDATA`, reports `pcFetched` as 1, and leaves the second element of the array untouched.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `enum-connections-one-item.twinproj` (attached as `enum-connections-one-item.zip`). Its one source file, `Startup.twin`, declares the project's own copies of the connection-point interfaces (`stdole` has none of them), a class `Source` with one event, and a class `Listener` with a `WithEvents` variable of type `Source`. `Sub Main` attaches two listeners to one source, takes the connection point, and asks for both connections at once:
-   ```
-   Dim items(0 To 1) As CONNECTDATA
-   Dim connections As IEnumConnections = point.EnumConnections()
-   connections.Next 2, items(0), fetched
-   Debug.Print "asked for 2, two connections present: fetched=" & fetched & ", cookies " & items(0).dwCookie & " and " & items(1).dwCookie
-   ```
-2. Run the project in the IDE (F5).
-3. See `asked for 2, two connections present: fetched=1, cookies 1 and 0`.
-
-**Expected behavior**
-`fetched` is 2 and the cookies are 1 and 2. The Windows SDK page for [IEnumConnections::Next](https://learn.microsoft.com/en-us/windows/win32/api/ocidl/nf-ocidl-ienumconnections-next) says *cConnections* is "The number of items to be retrieved. If there are fewer than the requested number of items left in the sequence, this method retrieves the remaining elements", *pcFetched* is "The number of items that were retrieved", and the return value is `S_OK` "If the method retrieves the number of items requested". A caller that passes an array and a count, as the page says it may, loses every connection after the first, and does not know it, because the call returns `S_OK`. VB6 follows the contract. With two `WithEvents` holders on one source object, `Next 2` returns `S_OK` with fetched=2 and both `CONNECTDATA` elements filled (the cookies are two different values, `4685276` and `4686156` in that run); `Next 3` returns `S_FALSE` with fetched=2; `Next 1` called three times returns the two items in turn, then `S_FALSE` with fetched=0, and `Next 2` after `Reset` returns both again.
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-Severity: low; the interface is mostly read one item at a time, which works, and the call at the end of the list is correct. It matters to a client that reads in blocks.
-
-What was tried: `Next 3` with two connections returns 1 item as well. `Next 1` called repeatedly returns the items in turn, and returns `S_FALSE` with 0 items at the end. `Skip` and `Clone` work, and a null *pcFetched* is accepted for a request of 1. `IEnumConnectionPoints`, the sibling enumerator, has a different fault (see the entry about its `E_FAIL`), so the two are separate.
-
-VB6 comparison: the VB6 project is attached as `enum-connections-one-item-vb6.zip`. VB6 cannot declare these interfaces, so it calls them through the vtable with `DispCallFunc` on raw pointers: a `Source` class with one `Event`, two `Holder` classes each with a `WithEvents` variable set to the one source, then the same calls. It was built with VB6 SP6 and run, and writes `out.txt` beside the exe. Its output for the call of this entry is `Next 2, two connections: hr=00000000 fetched=2, cookies 4685276 4686156`, against twinBASIC's `fetched=1, cookies 1 and 0`. The other calls match twinBASIC: `Skip 1` and `Clone` return `S_OK`, a null *pcFetched* is accepted for `Next 1`, and `Next 1` at the end returns `S_FALSE` with fetched=0. VB6's cookies are large values, not 1 and 2, so only the count and the two distinct non-zero cookies are the expectation, not the values 1 and 2.
-
-<!-- Reproducer: bugs/enum-connections-one-item/ (mode run, expects tbrun exit 0 and the line above); verified on 995. Stated in docs/Reference/COM-Interfaces/IConnectionPoint.md, section "The enumerators" (the IEnumConnections column of the table, and the closing paragraph) and the sentence after the declarations that says the enumerators return one item per call: when fixed, change them. -->
diff --git a/bugs/filed/enum-connections-one-item/enum-connections-one-item.twinproj b/bugs/filed/enum-connections-one-item/enum-connections-one-item.twinproj
deleted file mode 100644
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diff --git a/bugs/filed/enum-connections-one-item/repro.json b/bugs/filed/enum-connections-one-item/repro.json
deleted file mode 100644
index 2ddfc55fc..000000000
--- a/bugs/filed/enum-connections-one-item/repro.json
+++ /dev/null
@@ -1,10 +0,0 @@
-{
-  "mode": "run",
-  "expect": {
-    "exit": 0,
-    "output": [
-      "^asked for 2, two connections present: fetched=1, cookies 1 and 0$"
-    ]
-  },
-  "issue": 2461
-}
diff --git a/bugs/filed/enum-connections-one-item/src/Settings b/bugs/filed/enum-connections-one-item/src/Settings
deleted file mode 100644
index e67c99a84..000000000
--- a/bugs/filed/enum-connections-one-item/src/Settings
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "EnumConnectionsOneItem",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard EXE",
-	"project.description": "Reproduces: t",
-	"project.exportPathIsV2": true,
-	"project.id": "{56E42A1F-E0AB-43A8-AEC4-446D3A1833A9}",
-	"project.name": "EnumConnectionsOneItem",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"symbolId": "stdole",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "VB",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 31
-		},
-		{
-			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "AppGlobalClassProject",
-			"versionBuild": 0,
-			"versionMajor": 1,
-			"versionMinor": 0,
-			"versionRevision": 0
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.startupObject": "Sub Main",
-	"project.warnings": {
-		"errors": [],
-		"hints": [],
-		"ignored": [],
-		"info": [],
-		"warnings": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/enum-connections-one-item/src/Sources/Startup.twin b/bugs/filed/enum-connections-one-item/src/Sources/Startup.twin
deleted file mode 100644
index f4f098a23..000000000
--- a/bugs/filed/enum-connections-one-item/src/Sources/Startup.twin
+++ /dev/null
@@ -1,69 +0,0 @@
-' The IEnumConnections that a connection point returns hands back one item per Next call,
-' even when asked for two with two connections present.
-Public Module Types
-    Public Type CONNECTDATA
-        pUnk As stdole.IUnknown
-        dwCookie As Long
-    End Type
-End Module
-
-[InterfaceId("B196B284-BAB4-101A-B69C-00AA00341D07")]
-Private Interface IConnectionPointContainer Extends stdole.IUnknown
-    Function EnumConnectionPoints() As IEnumConnectionPoints
-End Interface
-
-[InterfaceId("B196B285-BAB4-101A-B69C-00AA00341D07")]
-Private Interface IEnumConnectionPoints Extends stdole.IUnknown
-    Sub Next(ByVal cConnections As Long, ByRef ppCP As IConnectionPoint, ByRef pcFetched As Long)
-End Interface
-
-[InterfaceId("B196B286-BAB4-101A-B69C-00AA00341D07")]
-Private Interface IConnectionPoint Extends stdole.IUnknown
-    Sub GetConnectionInterface(ByVal piid As LongPtr)
-    Function GetConnectionPointContainer() As IConnectionPointContainer
-    Function Advise(ByVal pUnkSink As stdole.IUnknown) As Long
-    Sub Unadvise(ByVal dwCookie As Long)
-    Function EnumConnections() As IEnumConnections
-End Interface
-
-[InterfaceId("B196B287-BAB4-101A-B69C-00AA00341D07")]
-Private Interface IEnumConnections Extends stdole.IUnknown
-    Sub Next(ByVal cConnections As Long, ByRef rgcd As CONNECTDATA, ByRef pcFetched As Long)
-    Sub Skip(ByVal cConnections As Long)
-    Sub Reset()
-    Function Clone() As IEnumConnections
-End Interface
-
-Private Class Source
-    Public Event Ping()
-End Class
-
-Private Class Listener
-    Private WithEvents Src As Source
-    Public Sub Attach(ByVal Target As Source)
-        Set Src = Target
-    End Sub
-    Private Sub Src_Ping()
-    End Sub
-End Class
-
-Module Startup
-
-    Public Sub Main()
-        Dim src As New Source
-        Dim a As New Listener, b As New Listener
-        a.Attach src
-        b.Attach src
-
-        Dim container As IConnectionPointContainer = src
-        Dim points As IEnumConnectionPoints = container.EnumConnectionPoints()
-        Dim point As IConnectionPoint, fetched As Long
-        points.Next 1, point, fetched
-
-        Dim items(0 To 1) As CONNECTDATA
-        Dim connections As IEnumConnections = point.EnumConnections()
-        connections.Next 2, items(0), fetched
-        Debug.Print "asked for 2, two connections present: fetched=" & fetched & ", cookies " & items(0).dwCookie & " and " & items(1).dwCookie
-    End Sub
-
-End Module
diff --git a/bugs/filed/enum-connections-one-item/vb6/Holder.cls b/bugs/filed/enum-connections-one-item/vb6/Holder.cls
deleted file mode 100644
index e2db21fa3..000000000
--- a/bugs/filed/enum-connections-one-item/vb6/Holder.cls
+++ /dev/null
@@ -1,20 +0,0 @@
-VERSION 1.0 CLASS
-BEGIN
-  MultiUse = -1  'True
-END
-Attribute VB_Name = "Holder"
-Attribute VB_GlobalNameSpace = False
-Attribute VB_Creatable = False
-Attribute VB_PredeclaredId = False
-Attribute VB_Exposed = False
-Option Explicit
-
-' Each Holder with a WithEvents variable set to the source is one connection.
-Private WithEvents Src As Source
-
-Public Sub Attach(ByVal Target As Source)
-    Set Src = Target
-End Sub
-
-Private Sub Src_Ping()
-End Sub
diff --git a/bugs/filed/enum-connections-one-item/vb6/Probe.vbp b/bugs/filed/enum-connections-one-item/vb6/Probe.vbp
deleted file mode 100644
index f4a01c6eb..000000000
--- a/bugs/filed/enum-connections-one-item/vb6/Probe.vbp
+++ /dev/null
@@ -1,9 +0,0 @@
-Type=Exe
-Module=ProbeMain; ProbeMain.bas
-Class=Source; Source.cls
-Class=Holder; Holder.cls
-Startup="Sub Main"
-ExeName32="Probe.exe"
-Name="Probe"
-CompilationType=0
-OptimizationType=0
diff --git a/bugs/filed/enum-connections-one-item/vb6/ProbeMain.bas b/bugs/filed/enum-connections-one-item/vb6/ProbeMain.bas
deleted file mode 100644
index 6e7c357bc..000000000
--- a/bugs/filed/enum-connections-one-item/vb6/ProbeMain.bas
+++ /dev/null
@@ -1,218 +0,0 @@
-Attribute VB_Name = "ProbeMain"
-Option Explicit
-
-' The VB6 counterpart of bugs/enum-connections-one-item and bugs/enum-connection-points-contract.
-' VB6 cannot declare IConnectionPointContainer, IEnumConnectionPoints, IConnectionPoint or
-' IEnumConnections, so each call goes through the vtable with DispCallFunc on raw pointers.
-' Vtable slots: IUnknown 0..2; IConnectionPointContainer.EnumConnectionPoints 3;
-' IEnumConnectionPoints / IEnumConnections Next 3, Skip 4, Reset 5, Clone 6;
-' IConnectionPoint.EnumConnections 7. Output goes to out.txt beside the exe.
-
-Private Declare Function DispCallFunc Lib "oleaut32" (ByVal pvInstance As Long, ByVal oVft As Long, ByVal cc As Long, ByVal vtReturn As Integer, ByVal cActuals As Long, prgvt As Integer, prgpvarg As Long, pvargResult As Variant) As Long
-Private Declare Function IIDFromString Lib "ole32" (ByVal lpsz As Long, lpiid As GUID) As Long
-
-Private Type GUID
-    Data1 As Long
-    Data2 As Integer
-    Data3 As Integer
-    Data4(0 To 7) As Byte
-End Type
-
-Private Type CONNECTDATA
-    pUnk As Long
-    dwCookie As Long
-End Type
-
-Private Const CC_STDCALL As Long = 4
-Private Const VT_I4 As Integer = 3
-
-Private Items(0 To 3) As CONNECTDATA
-Private Points(0 To 3) As Long
-
-Sub Main()
-    On Error GoTo Fail
-    Open App.Path & "\out.txt" For Output As #9
-    Run
-    Close #9
-    Exit Sub
-Fail:
-    On Error Resume Next
-    Print #9, "unhandled error " & Err.Number & ": " & Err.Description
-    Close #9
-End Sub
-
-Private Sub Emit(ByVal s As String)
-    Print #9, s
-End Sub
-
-Private Function H(ByVal v As Long) As String
-    H = Right$("00000000" & Hex$(v), 8)
-End Function
-
-' Calls vtable slot Slot of the object at pObj with up to four Long arguments; returns the HRESULT.
-Private Function VCall(ByVal pObj As Long, ByVal Slot As Long, ParamArray A() As Variant) As Long
-    Dim n As Long, i As Long
-    Dim vars(0 To 3) As Variant
-    Dim vts(0 To 3) As Integer
-    Dim ptrs(0 To 3) As Long
-    Dim res As Variant
-    Dim rc As Long
-    n = UBound(A) + 1
-    For i = 0 To n - 1
-        vars(i) = CLng(A(i))
-        vts(i) = VT_I4
-        ptrs(i) = VarPtr(vars(i))
-    Next i
-    res = Empty
-    rc = DispCallFunc(pObj, Slot * 4, CC_STDCALL, VT_I4, n, vts(0), ptrs(0), res)
-    If rc <> 0 Then
-        VCall = rc
-    Else
-        VCall = CLng(res)
-    End If
-End Function
-
-Private Sub ReleasePtr(ByVal p As Long)
-    If p <> 0 Then VCall p, 2
-End Sub
-
-Private Sub Run()
-    Dim src As Source
-    Dim a As Holder, b As Holder
-    Dim iid As GUID
-    Dim pCPC As Long, pEnumPts As Long, pPoint As Long
-    Dim hr As Long
-
-    Set src = New Source
-    Set a = New Holder
-    Set b = New Holder
-    a.Attach src
-    b.Attach src
-
-    hr = IIDFromString(StrPtr("{B196B284-BAB4-101A-B69C-00AA00341D07}"), iid)
-    Emit "IIDFromString: hr=" & H(hr)
-    hr = VCall(ObjPtr(src), 0, VarPtr(iid), VarPtr(pCPC))
-    Emit "QueryInterface(IConnectionPointContainer): hr=" & H(hr) & " ptr<>0: " & (pCPC <> 0)
-    If pCPC = 0 Then Exit Sub
-
-    ' --- IEnumConnectionPoints: the sequence of enum-connection-points-contract ---
-    hr = VCall(pCPC, 3, VarPtr(pEnumPts))
-    Emit "EnumConnectionPoints: hr=" & H(hr)
-    If pEnumPts = 0 Then Exit Sub
-    PointsNext pEnumPts, 1, "Next 1, one point"
-    PointsNext pEnumPts, 1, "Next 1, at the end"
-    Emit "Reset: hr=" & H(VCall(pEnumPts, 5))
-    PointsNext pEnumPts, 2, "Next 2, one point"
-    Emit "Reset: hr=" & H(VCall(pEnumPts, 5))
-    Emit "Skip 1: hr=" & H(VCall(pEnumPts, 4, 1))
-    Dim pCopy As Long
-    hr = VCall(pEnumPts, 6, VarPtr(pCopy))
-    Emit "Clone: hr=" & H(hr) & " ptr<>0: " & (pCopy <> 0)
-    ReleasePtr pCopy
-    ReleasePtr pEnumPts
-
-    ' --- IEnumConnections: the sequence of enum-connections-one-item ---
-    hr = VCall(pCPC, 3, VarPtr(pEnumPts))
-    Emit "EnumConnectionPoints (again): hr=" & H(hr)
-    PointsNext pEnumPts, 1, "Next 1, one point (to get the point)"
-    pPoint = Points(0)
-    Points(0) = 0
-    ReleasePtr pEnumPts
-    If pPoint = 0 Then Exit Sub
-
-    Dim pEnum As Long, pClone As Long
-
-    pEnum = NewConnEnum(pPoint)
-    ConnNext pEnum, 2, "Next 2, two connections"
-    ConnNext pEnum, 1, "Next 1, after Next 2 took both"
-    ReleasePtr pEnum
-
-    pEnum = NewConnEnum(pPoint)
-    ConnNext pEnum, 3, "Next 3, two connections"
-    ReleasePtr pEnum
-
-    pEnum = NewConnEnum(pPoint)
-    ConnNext pEnum, 1, "Next 1, first"
-    ConnNext pEnum, 1, "Next 1, second"
-    ConnNext pEnum, 1, "Next 1, at the end"
-    Emit "Reset: hr=" & H(VCall(pEnum, 5))
-    ConnNext pEnum, 2, "Next 2, after Reset"
-    ReleasePtr pEnum
-
-    pEnum = NewConnEnum(pPoint)
-    Emit "Skip 1: hr=" & H(VCall(pEnum, 4, 1))
-    ConnNext pEnum, 1, "Next 1, after Skip 1"
-    ReleasePtr pEnum
-
-    pEnum = NewConnEnum(pPoint)
-    ConnNext pEnum, 1, "Next 1, before Clone"
-    pClone = 0
-    hr = VCall(pEnum, 6, VarPtr(pClone))
-    Emit "Clone: hr=" & H(hr) & " ptr<>0: " & (pClone <> 0)
-    If pClone <> 0 Then ConnNext pClone, 2, "Next 2 on the clone, one left"
-    ReleasePtr pClone
-    ReleasePtr pEnum
-
-    pEnum = NewConnEnum(pPoint)
-    ClearItems
-    hr = VCall(pEnum, 3, 1, VarPtr(Items(0)), 0)
-    Emit "Next 1 with null pcFetched: hr=" & H(hr) & " cookie=" & Items(0).dwCookie
-    ReleaseItems
-    ReleasePtr pEnum
-
-    ReleasePtr pPoint
-    ReleasePtr pCPC
-End Sub
-
-Private Sub PointsNext(ByVal pEnumPts As Long, ByVal Count As Long, ByVal Label As String)
-    Dim i As Long, hr As Long, fetched As Long
-    For i = 0 To 3
-        Points(i) = 0
-    Next i
-    fetched = -1
-    hr = VCall(pEnumPts, 3, Count, VarPtr(Points(0)), VarPtr(fetched))
-    Emit Label & ": hr=" & H(hr) & " fetched=" & fetched
-    ' Points(0) stays set for the caller that wants the point; release every other pointer.
-    Dim keep As Long
-    If InStr(Label, "to get the point") > 0 Then keep = 1 Else keep = 0
-    For i = keep To 3
-        ReleasePtr Points(i)
-        Points(i) = 0
-    Next i
-End Sub
-
-Private Function NewConnEnum(ByVal pPoint As Long) As Long
-    Dim hr As Long, p As Long
-    hr = VCall(pPoint, 7, VarPtr(p))
-    If hr <> 0 Then Emit "EnumConnections: hr=" & H(hr)
-    NewConnEnum = p
-End Function
-
-Private Sub ClearItems()
-    Dim i As Long
-    For i = 0 To 3
-        Items(i).pUnk = 0
-        Items(i).dwCookie = 0
-    Next i
-End Sub
-
-Private Sub ReleaseItems()
-    Dim i As Long
-    For i = 0 To 3
-        ReleasePtr Items(i).pUnk
-        Items(i).pUnk = 0
-    Next i
-End Sub
-
-Private Sub ConnNext(ByVal pEnum As Long, ByVal Count As Long, ByVal Label As String)
-    Dim hr As Long, fetched As Long, i As Long, s As String
-    ClearItems
-    fetched = -1
-    hr = VCall(pEnum, 3, Count, VarPtr(Items(0)), VarPtr(fetched))
-    s = ""
-    For i = 0 To Count - 1
-        s = s & " " & Items(i).dwCookie
-    Next i
-    Emit Label & ": hr=" & H(hr) & " fetched=" & fetched & ", cookies" & s
-    ReleaseItems
-End Sub
diff --git a/bugs/filed/enum-connections-one-item/vb6/Source.cls b/bugs/filed/enum-connections-one-item/vb6/Source.cls
deleted file mode 100644
index 59f1b368c..000000000
--- a/bugs/filed/enum-connections-one-item/vb6/Source.cls
+++ /dev/null
@@ -1,13 +0,0 @@
-VERSION 1.0 CLASS
-BEGIN
-  MultiUse = -1  'True
-END
-Attribute VB_Name = "Source"
-Attribute VB_GlobalNameSpace = False
-Attribute VB_Creatable = False
-Attribute VB_PredeclaredId = False
-Attribute VB_Exposed = False
-Option Explicit
-
-' A class with one event, so one connection point.
-Public Event Ping()
diff --git a/bugs/filed/enum-member-description-hover/REPORT.md b/bugs/filed/enum-member-description-hover/REPORT.md
deleted file mode 100644
index eafc22f5e..000000000
--- a/bugs/filed/enum-member-description-hover/REPORT.md
+++ /dev/null
@@ -1,51 +0,0 @@
-Filed as [twinbasic/twinbasic#2465](https://github.com/twinbasic/twinbasic/issues/2465).
-
-## A member's `[Description]` is listed as a member of its enum in the hover, and is not shown on the member
-
-**Describe the bug**
-Hovering over an enum whose member carries a `[Description]` attribute lists the attribute in the hover's *contains* list, as if it were a third member of the enum. Hovering over the member itself shows no description. With the enum below, hovering over `Shade` shows `Dark`, `Light` and a third line, `Description("The light one.")`, and hovering over `Light` shows its value and where it is declared, and nothing of "The light one.". The project compiles clean.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `enum-member-description-hover.twinproj` (attached as `enum-member-description-hover.zip`) and open `Startup.twin`. It holds:
-   ```
-   Module DescProbe
-       [Description("A colour.")]
-       Public Enum Shade
-           [Description("The light one.")]
-           Light = 1
-           Dark = 2
-       End Enum
-
-       Public Sub UseThem()
-           Debug.Print Shade.Light, Dark
-       End Sub
-   End Module
-   ```
-2. Hover over `Shade` where `UseThem` writes `Shade.Light`.
-3. The hover shows:
-
-   > *enum* **Shade** ... in component EnumMemberDescriptionHover.DescProbe
-   >
-   > A colour.
-   >
-   > **contains**
-   >  - Dark
-   >  - Light
-   >  - Description("The light one.")
-
-4. Hover over `Light`. The hover shows `*enum-value* **Light** = 1 (&H00000001)` and `in EnumMemberDescriptionHover.DescProbe.Shade`, and no description.
-
-**Expected behavior**
-The *contains* list holds `Dark` and `Light` only, and the hover over `Light` shows "The light one.", as the hover over a procedure, a constant or a variable with a `[Description]` shows its text: the hover over a constant ends with its description.
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-The enum's own `[Description]`, "A colour.", is shown, so the attribute is read on the enum, and the same attribute on a member is taken for a member. This was checked by sending `textDocument/hover` over the compiler's language socket, with the parameters the IDE's own hover provider sends; the text above is the markdown that request returns, which is what the IDE's hover shows. The tooltip itself was not looked at in this run.
-
-Severity: cosmetic, but the hover is where a `[Description]` on an enum member is meant to be read, and the list names a member that does not exist.
-
-<!-- Asserted by `addin-test.bat --only symbols` (test/addin/symbols.test.mjs, the last P15 case, over test/addin/probes/symbols/Sources/Described.twin); passes on BETA 995. The reproducer's hover text above was checked on BETA 995 against the reproducer itself. No page carries a callout: the help add-in reads a member's description from its own hover, which has none. When fixed: make that test say what is right, and retire this entry. -->
diff --git a/bugs/filed/enum-member-description-hover/enum-member-description-hover.twinproj b/bugs/filed/enum-member-description-hover/enum-member-description-hover.twinproj
deleted file mode 100644
index 8920e0d2e501e2f6ad931fa21ee3cda612bd9b5f..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

literal 2520
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diff --git a/bugs/filed/enum-member-description-hover/repro.json b/bugs/filed/enum-member-description-hover/repro.json
deleted file mode 100644
index 953813a2e..000000000
--- a/bugs/filed/enum-member-description-hover/repro.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "mode": "manual",
-  "steps": "1. Open enum-member-description-hover.twinproj in the twinBASIC IDE and open Startup.twin.\n2. Hover the mouse over Shade, where UseThem writes Shade.Light.\n3. The hover shows: *enum* **Shade** ... in component EnumMemberDescriptionHover.DescProbe, then \"A colour.\", then a contains list of three lines: - Dark, - Light and - Description(\"The light one.\"). The attribute on Light is listed as if it were a third member of the enum.\n4. Hover over Light. The hover shows *enum-value* **Light** = 1 (&H00000001) in EnumMemberDescriptionHover.DescProbe.Shade, with no description: \"The light one.\" is shown nowhere.\nExpected: the contains list holds Dark and Light only, and the hover over Light shows \"The light one.\", as the hover over a procedure, a constant or a variable with a [Description] shows its text.\nChecked on BETA 995 by sending textDocument/hover over the compiler's language socket, as the IDE's own hover provider does; the text in steps 3 and 4 is what that request returns, and the hover tooltip itself was not looked at.",
-  "issue": 2465
-}
diff --git a/bugs/filed/enum-member-description-hover/src/Settings b/bugs/filed/enum-member-description-hover/src/Settings
deleted file mode 100644
index 3e77d70cd..000000000
--- a/bugs/filed/enum-member-description-hover/src/Settings
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "EnumMemberDescriptionHover",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard EXE",
-	"project.description": "Reproduces: A member's `[Description]` is listed as a member of its enum in the hover, and is not shown on the member",
-	"project.exportPathIsV2": true,
-	"project.id": "{A7CEE9B8-7276-4B81-9EE0-D69C43188CAE}",
-	"project.name": "EnumMemberDescriptionHover",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"symbolId": "stdole",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "VB",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 31
-		},
-		{
-			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "AppGlobalClassProject",
-			"versionBuild": 0,
-			"versionMajor": 1,
-			"versionMinor": 0,
-			"versionRevision": 0
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.startupObject": "Sub Main",
-	"project.warnings": {
-		"errors": [],
-		"hints": [],
-		"ignored": [],
-		"info": [],
-		"warnings": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/enum-member-description-hover/src/Sources/Startup.twin b/bugs/filed/enum-member-description-hover/src/Sources/Startup.twin
deleted file mode 100644
index 3ba43c20b..000000000
--- a/bugs/filed/enum-member-description-hover/src/Sources/Startup.twin
+++ /dev/null
@@ -1,17 +0,0 @@
-' Hover over Shade and over Light where UseThem uses them. project.optionExplicit is true.
-Module DescProbe
-    [Description("A colour.")]
-    Public Enum Shade
-        [Description("The light one.")]
-        Light = 1
-        Dark = 2
-    End Enum
-
-    Public Sub UseThem()
-        Debug.Print Shade.Light, Dark
-    End Sub
-
-    Public Sub Main()
-        UseThem
-    End Sub
-End Module
diff --git a/bugs/filed/export-follows-junction/REPORT.md b/bugs/filed/export-follows-junction/REPORT.md
deleted file mode 100644
index 823ae6e56..000000000
--- a/bugs/filed/export-follows-junction/REPORT.md
+++ /dev/null
@@ -1,38 +0,0 @@
-Filed as [twinbasic/twinbasic#2456](https://github.com/twinbasic/twinbasic/issues/2456).
-
-## Export Project follows a directory junction in its folder and deletes what it points to
-
-**Describe the bug**
-**File → Export Project** empties its export folder before it writes, as the *Export Path* setting warns. It does not stop at a directory junction in that folder: it goes through the junction, deletes the files in the folder the junction points to, and then deletes the junction. Data outside the export folder is lost, and the only record is the Debug Console, with *Export Verbose* on.
-
-**To Reproduce**
-**This deletes files.** Do it only in a scratch folder made for this, `<S>` below, for example `C:\Scratch\junction-test`. Everything in `<S>\outside` is deleted.
-
-Steps to reproduce the behavior:
-1. Open `export-follows-junction.twinproj` (attached as `export-follows-junction.zip`), after unzipping it into `<S>`. Its *Export Path* is `${SourcePath}\export` and *Export Verbose* is on (Project Settings, Export).
-2. In a Command Prompt, make the export folder, a folder outside it that holds a file, and a junction in the export folder to that folder:
-   ```
-   mkdir <S>\export
-   mkdir <S>\outside
-   echo keep me> <S>\outside\precious.txt
-   mklink /J <S>\export\linked <S>\outside
-   ```
-3. Choose **File → Export Project**.
-4. The Debug Console shows:
-   ```
-   [EXPORT]  DELETED: \\?\<S>\export\linked\precious.txt
-   [EXPORT]  DELETED: \\?\<S>\export\linked
-   ```
-   and `<S>\outside` is empty afterwards.
-
-**Expected behavior**
-The export deletes the junction itself, or leaves it alone, and never what it points to. A junction (or symbolic link) is not part of the export folder's contents.
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-Severity: data loss outside the folder the user chose. The command-line `export` verb does not reproduce it: it deletes nothing.
-
-<!-- Asserted by `ide-test.bat --only export` (test/ide/export.test.mjs, "a junction in the export folder is followed, and its target emptied"), which calls the IDE's own `exportProjectTo()` over DevTools on a folder in the lane's work folder; passes on BETA 995. Found by the Export Project probe for round 8's UC-55. When fixed: update that test, docs/IDE/Menu/File.md and docs/IDE/Project Settings.md if they warn about it. The reproducer is mode manual: its steps are what a person does in the IDE, and nothing here changes the reader's registry. -->
diff --git a/bugs/filed/export-follows-junction/export-follows-junction.twinproj b/bugs/filed/export-follows-junction/export-follows-junction.twinproj
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GIT binary patch
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diff --git a/bugs/filed/export-follows-junction/repro.json b/bugs/filed/export-follows-junction/repro.json
deleted file mode 100644
index dced202b5..000000000
--- a/bugs/filed/export-follows-junction/repro.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "mode": "manual",
-  "steps": "WARNING: File > Export Project empties its export folder before it writes, and this bug makes it empty the folder a junction in that folder points to as well. Do it only in a scratch folder made for this, <S> below (for example C:\\Scratch\\junction-test). Anything in <S>\\outside is deleted.\n1. Unzip export-follows-junction.zip into <S>, so that <S>\\export-follows-junction.twinproj exists.\n2. In a Command Prompt: mkdir <S>\\export, mkdir <S>\\outside, echo keep me> <S>\\outside\\precious.txt, then mklink /J <S>\\export\\linked <S>\\outside.\n3. Open the project in the twinBASIC IDE. Its Export Path is ${SourcePath}\\export and Export Verbose is on (Project Settings, Export).\n4. Choose File > Export Project.\n5. See, in the DEBUG CONSOLE, [EXPORT]  DELETED: \\\\?\\<S>\\export\\linked\\precious.txt and then [EXPORT]  DELETED: \\\\?\\<S>\\export\\linked. <S>\\outside is empty: precious.txt is gone.\nRe-measured on BETA 995 by `ide-test.bat --only export` (it calls exportProjectTo() on a scratch folder under its work folder).",
-  "issue": 2456
-}
diff --git a/bugs/filed/export-follows-junction/src/Settings b/bugs/filed/export-follows-junction/src/Settings
deleted file mode 100644
index 609cc3e8c..000000000
--- a/bugs/filed/export-follows-junction/src/Settings
+++ /dev/null
@@ -1,63 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "ExportFollowsJunction",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard EXE",
-	"project.description": "Reproduces: Export Project follows a directory junction in its folder and deletes what it points to",
-	"project.exportPath": "${SourcePath}\\export",
-	"project.exportPathIsV2": true,
-	"project.exportVerbose": true,
-	"project.id": "{CB4E9670-139D-4170-99CD-7A828375DA9D}",
-	"project.name": "ExportFollowsJunction",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"symbolId": "stdole",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "VB",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 31
-		},
-		{
-			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "AppGlobalClassProject",
-			"versionBuild": 0,
-			"versionMajor": 1,
-			"versionMinor": 0,
-			"versionRevision": 0
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.startupObject": "Sub Main",
-	"project.warnings": {
-		"errors": [],
-		"hints": [],
-		"ignored": [],
-		"info": [],
-		"warnings": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/export-follows-junction/src/Sources/Startup.twin b/bugs/filed/export-follows-junction/src/Sources/Startup.twin
deleted file mode 100644
index 1cd8339bc..000000000
--- a/bugs/filed/export-follows-junction/src/Sources/Startup.twin
+++ /dev/null
@@ -1,5 +0,0 @@
-' Nothing to run. The bug is in File > Export Project, which the steps in the report set up.
-Module Startup
-    Public Sub Main()
-    End Sub
-End Module
diff --git a/bugs/filed/f1-fold-signature-help/REPORT.md b/bugs/filed/f1-fold-signature-help/REPORT.md
deleted file mode 100644
index c874f733f..000000000
--- a/bugs/filed/f1-fold-signature-help/REPORT.md
+++ /dev/null
@@ -1,28 +0,0 @@
-Filed as [twinbasic/twinbasic#2446](https://github.com/twinbasic/twinbasic/issues/2446).
-
-## F1 and the fold icon toggle the signature help, then fail
-
-**Describe the bug**
-In the code editor's signature help, F1 and a click on the fold icon both toggle the help between expanded and collapsed, and then fail. Every F1 adds `command failed: "tbHelp_ToggleExpandSignatureHelp"` to the Debug Console, and every click on the icon throws an error in the page. The toggle works, so the error is the only symptom.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `f1-fold-signature-help.twinproj` (attached as `f1-fold-signature-help.zip`) and open `Main.twin`. Put the cursor inside the parentheses of the call `FindTheNeedle(3)` and press Ctrl+Space. The signature help shows, with a fold icon whose tooltip reads *Fold/Collapse (F1)*.
-2. Press F1. The signature help expands, and the Debug Console shows `command failed: "tbHelp_ToggleExpandSignatureHelp"`. F1 again collapses it, with a second such line.
-3. Click the fold icon instead. The signature help toggles, and the page throws `TypeError: Cannot read properties of undefined (reading 'stopPropagation') at toggleSigHelp`.
-
-**Expected behavior**
-The toggle, and no error.
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-Severity: cosmetic. The toggle works, but every F1 adds the failure line to the Debug Console, and every click on the icon throws in the page.
-
-`toggleSigHelp(e)` in `ide/main.js` ends with `e.stopPropagation();e.preventDefault()`, and neither caller passes an event: the command is `internalAction:()=>{toggleSigHelp()}`, and the icon is `onclick='toggleSigHelp()'`. The toggle comes first, so the error is the only symptom. `executeKeyboardShortcuts` catches the command's error and writes the Debug Console line.
-
-F1 was measured on BETA 995, in a run where an add-in that registers F1 was loaded (it only shows that the shortcut fires; the IDE's own command is the one that fails). The click on the icon was measured on BETA 983, in a harness IDE with the page's exceptions recorded over CDP; `toggleSigHelp` and both callers are unchanged in BETA 995's `ide/main.js`.
-
-<!-- Asserted by `addin-test.bat --only keys` (test/addin/keys.test.mjs, "P2: F1 while signature help shows toggles it, the IDE reports a failure, and the add-in fires"), which checks for the failure line; passes on BETA 995. The reproducer is the lane's host project (test/addin/host) with header comments, with no add-in, so the F1 step is the lane's minus the add-in's shortcut: not run without it. First observed on 2026-09-24. When fixed: update P2 in WIP.HelpAddin.md and that test. -->
diff --git a/bugs/filed/f1-fold-signature-help/f1-fold-signature-help.twinproj b/bugs/filed/f1-fold-signature-help/f1-fold-signature-help.twinproj
deleted file mode 100644
index acdf3db8d4ef0379301604c696efdcfe70288a08..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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diff --git a/bugs/filed/f1-fold-signature-help/repro.json b/bugs/filed/f1-fold-signature-help/repro.json
deleted file mode 100644
index aa196caad..000000000
--- a/bugs/filed/f1-fold-signature-help/repro.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "mode": "manual",
-  "steps": "1. Open f1-fold-signature-help.twinproj in the twinBASIC IDE and open Main.twin. Put the cursor inside the parentheses of FindTheNeedle( in the call, and press Ctrl+Space. The signature help shows, with a fold icon whose tooltip reads Fold/Collapse (F1).\n2. Press F1. The signature help expands, and the DEBUG CONSOLE shows command failed: \"tbHelp_ToggleExpandSignatureHelp\". F1 again collapses it, with a second such line.\n3. Click the fold icon instead. The signature help toggles, and the IDE page throws TypeError: Cannot read properties of undefined (reading 'stopPropagation') at toggleSigHelp.\nExpected: the toggle, and no error. Measured on BETA 995 by `addin-test.bat --only keys` (the last test; an add-in that registers F1 was loaded in that run, to see the shortcut fire, and the IDE's own command fails the same way). The click was measured on BETA 983 only, in a harness IDE with the page's exceptions recorded over CDP; toggleSigHelp and both callers are unchanged in BETA 995's ide/main.js.",
-  "issue": 2446
-}
diff --git a/bugs/filed/f1-fold-signature-help/src/Settings b/bugs/filed/f1-fold-signature-help/src/Settings
deleted file mode 100644
index 50517dba9..000000000
--- a/bugs/filed/f1-fold-signature-help/src/Settings
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "F1FoldSignatureHelp",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard EXE",
-	"project.description": "Reproduces: F1 and the fold icon toggle the signature help, then fail",
-	"project.exportPathIsV2": true,
-	"project.id": "{E749543A-96A4-414C-83F4-CAE38BBA3E60}",
-	"project.name": "F1FoldSignatureHelp",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"symbolId": "stdole",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "VB",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 31
-		},
-		{
-			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "AppGlobalClassProject",
-			"versionBuild": 0,
-			"versionMajor": 1,
-			"versionMinor": 0,
-			"versionRevision": 0
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.startupObject": "Sub Main",
-	"project.warnings": {
-		"errors": [],
-		"hints": [],
-		"ignored": [],
-		"info": [],
-		"warnings": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/f1-fold-signature-help/src/Sources/Haystack.twin b/bugs/filed/f1-fold-signature-help/src/Sources/Haystack.twin
deleted file mode 100644
index 9da7815c2..000000000
--- a/bugs/filed/f1-fold-signature-help/src/Sources/Haystack.twin
+++ /dev/null
@@ -1,8 +0,0 @@
-' A haystack with a needle in it.
-Module Haystack
-    Public Function FindTheNeedle(ByVal n As Long) As Long
-        Dim needleCount As Long
-        needleCount = n * 2
-        Return needleCount
-    End Function
-End Module
diff --git a/bugs/filed/f1-fold-signature-help/src/Sources/Main.twin b/bugs/filed/f1-fold-signature-help/src/Sources/Main.twin
deleted file mode 100644
index 73585bb79..000000000
--- a/bugs/filed/f1-fold-signature-help/src/Sources/Main.twin
+++ /dev/null
@@ -1,8 +0,0 @@
-' Put the cursor inside the parentheses of FindTheNeedle( and press Ctrl+Space to show the signature help.
-Module Main
-    Public Sub Main()
-        Dim needle As Long
-        needle = FindTheNeedle(3)
-        Debug.Print needle
-    End Sub
-End Module
diff --git a/bugs/filed/filecopy-open-file/REPORT.md b/bugs/filed/filecopy-open-file/REPORT.md
deleted file mode 100644
index ae9c539fd..000000000
--- a/bugs/filed/filecopy-open-file/REPORT.md
+++ /dev/null
@@ -1,30 +0,0 @@
-Filed as [twinbasic/twinbasic#2451](https://github.com/twinbasic/twinbasic/issues/2451).
-
-## `FileCopy` of an open file raises `&H80004005`, where VB6 raises 55 or copies it
-
-**Describe the bug**
-`FileCopy` of a file that is open raises -2147467259 (`&H80004005`, *Unspecified error*), whatever mode the file is open in. VB6 raises error 55, *File already open*, for a file open `For Append`, and copies a file open `For Input` without an error. Code that handles VB6's error 55 does not recognise the error, and a copy that VB6 makes is refused.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `filecopy-open-file.twinproj` (attached as `filecopy-open-file.zip`) and run it (F5). Its `Sub Main` makes a file in `%TEMP%` and then does this:
-   ```
-   On Error Resume Next
-   Open f For Append As #2
-   FileCopy f, f & ".copy"
-   Debug.Print Err.Number, Err.Description
-   ```
-2. See `-2147467259 Unspecified error`. VB6 prints `55 File already open`.
-3. See the second line the project prints: with the file open `For Input` instead, twinBASIC raises the same `-2147467259`, and VB6 copies the file without an error.
-
-**Expected behavior**
-Error 55 for the file open `For Append`, and a successful copy for the file open `For Input`, as in VB6.
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-BETA 983 copied an open file with no error, in both modes (the project prints 0 for all three lines); BETA 984's notes list the change ("FileSystem.FileCopy function would previously allow copying of an already open file without error"), and only the error number and the `Input` case differ from VB6. What does not reproduce it: the file closed (the third line the project prints is 0). Severity: code that handles VB6's error 55 does not recognise the error, and a copy that VB6 makes is refused.
-
-<!-- Stated by docs/Reference/Default/VBA/FileSystem/FileCopy.md (the note at line 25); when fixed, update it. Measured with scripts/bug_repro.mjs (run mode, verify) on 995 and 983; the VB6 results are from the same statements compiled by `VB6.EXE /make` and run, on 2026-10-01. -->
diff --git a/bugs/filed/filecopy-open-file/filecopy-open-file.twinproj b/bugs/filed/filecopy-open-file/filecopy-open-file.twinproj
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GIT binary patch
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diff --git a/bugs/filed/filecopy-open-file/repro.json b/bugs/filed/filecopy-open-file/repro.json
deleted file mode 100644
index 4c2b6be14..000000000
--- a/bugs/filed/filecopy-open-file/repro.json
+++ /dev/null
@@ -1,12 +0,0 @@
-{
-  "mode": "run",
-  "expect": {
-    "exit": 0,
-    "output": [
-      "^open For Append: -2147467259 ",
-      "^open For Input:  -2147467259 ",
-      "^closed:\\s+0\\s*$"
-    ]
-  },
-  "issue": 2451
-}
diff --git a/bugs/filed/filecopy-open-file/src/Settings b/bugs/filed/filecopy-open-file/src/Settings
deleted file mode 100644
index 4f72a85ee..000000000
--- a/bugs/filed/filecopy-open-file/src/Settings
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "FilecopyOpenFile",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard EXE",
-	"project.description": "Reproduces: FileCopy of an open file raises `&H80004005`, where VB6 raises 55 or copies it",
-	"project.exportPathIsV2": true,
-	"project.id": "{C8DBD6E9-219B-4F1A-A73E-EA267F50EA49}",
-	"project.name": "FilecopyOpenFile",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"symbolId": "stdole",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "VB",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 31
-		},
-		{
-			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "AppGlobalClassProject",
-			"versionBuild": 0,
-			"versionMajor": 1,
-			"versionMinor": 0,
-			"versionRevision": 0
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.startupObject": "Sub Main",
-	"project.warnings": {
-		"errors": [],
-		"hints": [],
-		"ignored": [],
-		"info": [],
-		"warnings": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/filecopy-open-file/src/Sources/Startup.twin b/bugs/filed/filecopy-open-file/src/Sources/Startup.twin
deleted file mode 100644
index 6774cb54a..000000000
--- a/bugs/filed/filecopy-open-file/src/Sources/Startup.twin
+++ /dev/null
@@ -1,30 +0,0 @@
-' FileCopy of an open file raises &H80004005, where VB6 raises error 55 or copies it.
-Module Startup
-
-    Public Sub Main()
-        Dim f As String = Environ$("TEMP") & "\filecopy-probe.txt"
-        Open f For Output As #1: Print #1, "one": Close #1
-
-        On Error Resume Next
-
-        Open f For Append As #2
-        FileCopy f, f & ".copy"
-        Debug.Print "open For Append: "; Err.Number; Err.Description     ' VB6: 55 File already open
-        Err.Clear
-        Close #2
-
-        Open f For Input As #2
-        FileCopy f, f & ".copy"
-        Debug.Print "open For Input:  "; Err.Number; Err.Description     ' VB6: copies, no error
-        Err.Clear
-        Close #2
-
-        FileCopy f, f & ".copy"
-        Debug.Print "closed:          "; Err.Number; Err.Description     ' no error
-        Err.Clear
-
-        Kill f
-        Kill f & ".copy"
-    End Sub
-
-End Module
diff --git a/bugs/filed/forms-by-index-crash/REPORT.md b/bugs/filed/forms-by-index-crash/REPORT.md
deleted file mode 100644
index 875fa1e83..000000000
--- a/bugs/filed/forms-by-index-crash/REPORT.md
+++ /dev/null
@@ -1,37 +0,0 @@
-Filed as [twinbasic/twinbasic#2458](https://github.com/twinbasic/twinbasic/issues/2458).
-
-## Reading `Forms` by index returns a broken reference, and the process then crashes
-
-**Describe the bug**
-In a loop over `Forms.Count`, `Set f = Forms(k)` with `f` declared `As Form`, followed by a read of `f.Name`, ends in an access violation (`0xC0000005`). As a compiled EXE the process exits with that code. Run in the IDE, the DEBUG CONSOLE reports `NATIVE EXCEPTION: ACCESS_VIOLATION` at the line that reads `f.Name`, and the run ends without returning.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `forms-by-index-crash.twinproj` (attached as `forms-by-index-crash.zip`). It is a Standard EXE project with one empty form, `Form1`, and a `Sub Main` that loads it:
-   ```
-   Dim f As Form
-   Dim k As Long
-   Load Form1
-   For k = 0 To Forms.Count - 1
-       Set f = Forms(k)
-       Debug.Print "k = "; k; " name = "; f.Name
-   Next k
-   ```
-2. Build the project and run the EXE, or run it in the IDE (F5).
-3. See the process end with `0xC0000005` (exit code -1073741819), or the access violation in the DEBUG CONSOLE.
-
-Declaring `f` As `Form1` or As `Object` instead, with everything else the same, returns the form and the program exits 0. With three forms loaded, the loop crashes the same way, and an earlier probe saw the loop variable corrupted: `k` read 0, 0, 0, then 8195702.
-
-**Expected behavior**
-`Forms(k)` returns the loaded form, `f.Name` is `Form1`, and the program exits 0, as it does with `f` declared `As Object`.
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-Also on BETA 983, as a compiled EXE (reproduced again with this project). Severity: crash (`0xC0000005`), from a form of access the documentation shows. What does not reproduce it, measured on BETA 995 as a compiled EXE: `Set f = Forms(0)` with the literal index 0 and no loop, then `f.Name`, returns `Form1` and the program exits 0; so does `s = Forms(0).Name`, and `Debug.Print Forms(0).Name`. An earlier entry said `s = Forms(0).Name` returns an empty string and the process later dies; this was not seen again here, and the loop is the smallest form found. From earlier probes: `n = 0: Set f = Forms(n)` outside a loop returns the form and the program exits 0; `For Each f In Forms` and `Unload Forms(i)` work; `Printers(0)` with a literal index works. A variant of the loop that wrote the name with a helper `Sub` instead of `Debug.Print` did not crash in one run; the crash was seen with `Debug.Print`, and with `Dim t As String = f.Name` and no printing.
-
-<!-- Stated by the note at docs/Reference/Default/VB/Global/index.md line 47, and by builder/REVIEW-USECASES-5b4cd37.md item 26. That note says `Forms(0).Name` returns an empty string and the same for `Set f = Forms(0)` outside a loop; neither reproduced on 995 in the EXE with this project, so re-check the note's wording before filing: the loop is what reproduces. Measured with scripts/bug_repro.mjs run mode with "exe": true (tbrun --exe), verify, on 995 and 983; the IDE run (F5) also crashes on 995. Earlier entry text: found by the fix pass for round 8's error-number findings and by the IDE debugging probe for round 8's UC-61. -->
-
-<!-- Narrowed after filing (2026-10-02, BETA 995 with 983 as control, identical; each case three times, deterministic; probes in %TEMP%/claude/forms-probe, not kept). The cause is not the loop: ObjPtr(Forms(0)) equals ObjPtr(Form1) the first time and is about 140 bytes higher on later calls, and Name read through that reference is "". Form1.Name and Forms.Count stay right throughout, so the form is not freed. Which code shows it depends on the expression: Set f = Forms(0) (f As Form) then "[" & f.Name & "]" is "" in the IDE and the exe, but Debug.Print f.Name prints Form1; Forms(0).Name is "" in the IDE only, where an access violation in OLEAUT32 follows; the exe crash needs Debug.Print with f.Name in the loop, as this report shows. As Object, As Form1 and For Each return Form1 in every run. Worth a follow-up comment on the issue: the ObjPtr evidence. docs/Reference/Default/VB/Global/index.md states this in its WARNING. -->
diff --git a/bugs/filed/forms-by-index-crash/forms-by-index-crash.twinproj b/bugs/filed/forms-by-index-crash/forms-by-index-crash.twinproj
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diff --git a/bugs/filed/forms-by-index-crash/repro.json b/bugs/filed/forms-by-index-crash/repro.json
deleted file mode 100644
index cbf52636c..000000000
--- a/bugs/filed/forms-by-index-crash/repro.json
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  "mode": "run",
-  "exe": true,
-  "expect": {
-    "exit": 6
-  },
-  "issue": 2458
-}
diff --git a/bugs/filed/forms-by-index-crash/src/Settings b/bugs/filed/forms-by-index-crash/src/Settings
deleted file mode 100644
index f99f10a51..000000000
--- a/bugs/filed/forms-by-index-crash/src/Settings
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "FormsByIndexCrash",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard EXE",
-	"project.description": "Reproduces: Reading `Forms` by index returns a broken reference, and the process then crashes",
-	"project.exportPathIsV2": true,
-	"project.id": "{E4316C37-27D2-4045-A50A-369871A26E4A}",
-	"project.name": "FormsByIndexCrash",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"symbolId": "stdole",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "VB",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 31
-		},
-		{
-			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "AppGlobalClassProject",
-			"versionBuild": 0,
-			"versionMajor": 1,
-			"versionMinor": 0,
-			"versionRevision": 0
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.startupObject": "Sub Main",
-	"project.warnings": {
-		"errors": [],
-		"hints": [],
-		"ignored": [],
-		"info": [],
-		"warnings": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/forms-by-index-crash/src/Sources/Form1.tbform b/bugs/filed/forms-by-index-crash/src/Sources/Form1.tbform
deleted file mode 100644
index a7f451a7d..000000000
--- a/bugs/filed/forms-by-index-crash/src/Sources/Form1.tbform
+++ /dev/null
@@ -1,83 +0,0 @@
-[
-	{
-		"AlwaysShowKeyboardCues": false,
-		"Appearance": "vbAppear3d",
-		"AutoRedraw": false,
-		"BackColor": -2147483633,
-		"BorderStyle": "vbSizable",
-		"Caption": "Form1",
-		"ClipControls": true,
-		"ControlBox": true,
-		"DrawMode": "vbCopyPen",
-		"DrawStyle": "vbSolid",
-		"DrawWidth": 1,
-		"Enabled": true,
-		"FillColor": 0,
-		"FillStyle": "vbFSTransparent",
-		"FontBold": false,
-		"FontItalic": false,
-		"FontName": "Segoe UI",
-		"FontSize": 8,
-		"FontStrikethru": false,
-		"FontTransparent": true,
-		"FontUnderline": false,
-		"ForeColor": -2147483630,
-		"FormDesignerId": "{EAEAEAEA-EAEA-EAEA-EAEA-EAEAEAEAEA01}",
-		"HasDC": true,
-		"Height": 300,
-		"HelpContextID": 0,
-		"Icon": [],
-		"KeyPreview": false,
-		"Left": 0,
-		"LinkMode": "vbLinkNone",
-		"LinkTopic": null,
-		"MDIChild": false,
-		"MaxButton": true,
-		"MaxHeight": 0,
-		"MaxWidth": 0,
-		"MinButton": true,
-		"MinHeight": 0,
-		"MinWidth": 0,
-		"MouseIcon": [],
-		"MousePointer": "vbDefault",
-		"Moveable": true,
-		"Name": "Form1",
-		"NegotiateMenus": false,
-		"OLEDropMode": "vbOLEDropNone",
-		"Opacity": 100,
-		"Palette": [],
-		"PaletteMode": "vbPaletteModeHalftone",
-		"Picture": [],
-		"PictureDpiScaling": false,
-		"RightToLeft": false,
-		"ScaleHeight": 4500,
-		"ScaleLeft": 0,
-		"ScaleMode": "vbTwips",
-		"ScaleTop": 0,
-		"ScaleWidth": 4500,
-		"ShowInTaskbar": true,
-		"StartUpPosition": "vbStartUpScreen",
-		"TabFocusAutoSelect": false,
-		"Tag": null,
-		"Top": 0,
-		"TopMost": false,
-		"TransparencyKey": -1,
-		"Visible": true,
-		"WhatsThisButton": false,
-		"WhatsThisHelp": false,
-		"Width": 300,
-		"WindowState": "vbNormal",
-		"__IDEOptions": {
-			"alignToGrid": false,
-			"gridHeight": 10,
-			"gridWidth": 10,
-			"lockedControls": [],
-			"multiColoredGrabbers": false,
-			"showGrid": true,
-			"showOutlines": false
-		},
-		"__lastUpdateMarker": 2061908507,
-		"_className": "Form",
-		"_clsid": "{33AD4F38-6699-11CF-B70C-00AA0060D393}"
-	}
-]
\ No newline at end of file
diff --git a/bugs/filed/forms-by-index-crash/src/Sources/Form1.twin b/bugs/filed/forms-by-index-crash/src/Sources/Form1.twin
deleted file mode 100644
index cc6a437d0..000000000
--- a/bugs/filed/forms-by-index-crash/src/Sources/Form1.twin
+++ /dev/null
@@ -1,10 +0,0 @@
-' An empty form, loaded by Startup.Main. Its design is in Form1.tbform.
-[Description("")]
-[FormDesignerId("EAEAEAEA-EAEA-EAEA-EAEA-EAEAEAEAEA01")]
-[PredeclaredId]
-Class Form1
-
-    Sub New()
-    End Sub
-
-End Class
diff --git a/bugs/filed/forms-by-index-crash/src/Sources/Startup.twin b/bugs/filed/forms-by-index-crash/src/Sources/Startup.twin
deleted file mode 100644
index 5dfd00b0e..000000000
--- a/bugs/filed/forms-by-index-crash/src/Sources/Startup.twin
+++ /dev/null
@@ -1,17 +0,0 @@
-' Reading Forms(k) through a variable declared As Form returns a broken reference, and the EXE crashes.
-' Build the project and run the EXE (Debug.Print writes nothing there): it ends with 0xC0000005.
-Module Startup
-
-    Public Sub Main()
-        Dim f As Form                ' the crash needs As Form; As Form1 or As Object works
-        Dim k As Long
-
-        Load Form1
-        For k = 0 To Forms.Count - 1
-            Set f = Forms(k)
-            Debug.Print "k = "; k; " name = "; f.Name
-        Next k
-        End
-    End Sub
-
-End Module
diff --git a/bugs/filed/hover-byval-option-explicit/REPORT.md b/bugs/filed/hover-byval-option-explicit/REPORT.md
deleted file mode 100644
index ce03019f7..000000000
--- a/bugs/filed/hover-byval-option-explicit/REPORT.md
+++ /dev/null
@@ -1,48 +0,0 @@
-Filed as [twinbasic/twinbasic#2448](https://github.com/twinbasic/twinbasic/issues/2448).
-
-## Hover says a `ByVal` parameter was auto-generated because `Option Explicit` is off
-
-**Describe the bug**
-In a project with `Option Explicit` on, hovering over a `ByVal` parameter of type `String`, `Variant`, `Object`, a class or tbIDE's `Host` shows a note that the variable was auto-generated because `Option Explicit` is off, and recommends turning it on. The option is on, and the parameter was declared by the user.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `hover-byval-option-explicit.twinproj` (attached as `hover-byval-option-explicit.zip`) and open `Symbols.twin`. `project.optionExplicit` is true in its `Settings`. The file holds:
-   ```
-   Public Sub Probe2(ByVal h As Host, ByVal count As Long, ByVal col As Collection, _
-                     ByVal o As Object, ByVal v As Variant, ByRef r As Host, ByVal s As String)
-       Dim d As Host
-       Debug.Print h Is Nothing, count, col Is Nothing, o Is Nothing, IsEmpty(v), r Is Nothing, s, d Is Nothing
-   End Sub
-   ```
-2. Hover over `s` where `Debug.Print` uses it.
-3. The hover shows:
-
-   > *parameter* ByVal s As String
-   >
-   > ***note:*** *this variable was auto-generated due to* ***Option Explicit*** *being Off*
-   >
-   > ***recommendation:*** *use Option Explicit and declare variables explicitly*
-
-| hovered | note |
-|---|---|
-| `ByVal` of `String`, `Variant`, `Object`, `Collection` or tbIDE's `Host` | **yes** |
-| `ByVal` of `Long` | no |
-| `ByRef r As Host` | no |
-| a local, `Dim d As Host` or `Dim c As New Collection` | no |
-
-**Expected behavior**
-No note on any of them: `Option Explicit` is on and every one of these names is declared.
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-Severity: cosmetic, but it tells the user to turn on an option that is already on, over a parameter they declared.
-
-So it takes `ByVal` and a type that is not a plain number. That looks like a hidden local copy that the compiler makes for such a parameter, which the hover then describes as a variable it generated for an undeclared name.
-
-This was measured by sending `textDocument/hover` over the compiler's language socket, with the parameters the IDE's own hover provider sends; the text above is the markdown that request returns, which is what the IDE's hover shows. The tooltip itself was not looked at in this run.
-
-<!-- Asserted by `addin-test.bat --only symbols` (test/addin/symbols.test.mjs, "hover says a ByVal parameter of String, Variant, Object or a class was made because Option Explicit is off, which it is not"), which checks every row of the table; passes on BETA 995 (observed first on 2026-09-24). The reproducer is test/addin/probes/symbols reduced to Probe2 and its Settings; the lane's own project also holds the procedures the other hover tests ask about. When fixed: update that test and P5 in WIP.HelpAddin.md. -->
diff --git a/bugs/filed/hover-byval-option-explicit/hover-byval-option-explicit.twinproj b/bugs/filed/hover-byval-option-explicit/hover-byval-option-explicit.twinproj
deleted file mode 100644
index 0e1c2b7d6b4b5845f66d248cfa26f1eaf71818ac..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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diff --git a/bugs/filed/hover-byval-option-explicit/repro.json b/bugs/filed/hover-byval-option-explicit/repro.json
deleted file mode 100644
index bec73993f..000000000
--- a/bugs/filed/hover-byval-option-explicit/repro.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "mode": "manual",
-  "steps": "1. Open hover-byval-option-explicit.twinproj in the twinBASIC IDE (project.optionExplicit is true in its Settings) and open Symbols.twin.\n2. Hover the mouse over the name s, where Debug.Print uses it.\n3. The hover shows: *parameter* ByVal s As String, then \"note: this variable was auto-generated due to Option Explicit being Off\" and \"recommendation: use Option Explicit and declare variables explicitly\".\n4. Hover over count (ByVal Long), r (ByRef r As Host) and d (a Dim): no such note. Over h (Host), col (Collection), o (Object) and v (Variant): the note.\nExpected: no note on any of them, since Option Explicit is on and the parameters are declared.\nRe-measured on BETA 995 by `addin-test.bat --only symbols` (a script sends textDocument/hover over the compiler's language socket, as the IDE's own hover provider does; the project is test/addin/probes/symbols). The text in step 3 is what that request returns; the hover tooltip itself was not looked at.",
-  "issue": 2448
-}
diff --git a/bugs/filed/hover-byval-option-explicit/src/Settings b/bugs/filed/hover-byval-option-explicit/src/Settings
deleted file mode 100644
index d8efc19c5..000000000
--- a/bugs/filed/hover-byval-option-explicit/src/Settings
+++ /dev/null
@@ -1,42 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "HoverByvalOptionExplicit",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard DLL",
-	"project.description": "Reproduces: Hover says a `ByVal` parameter was auto-generated because `Option Explicit` is off",
-	"project.exportPathIsV2": true,
-	"project.id": "{0A327BDD-05D5-4672-AE72-41AF6C684CD8}",
-	"project.name": "HoverByvalOptionExplicit",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{99DEC38C-75F6-4488-8EE7-2D52D83881D2}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC IDE Extensibility Package",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "tbIDE",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 1
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.warnings": {
-		"errors": [],
-		"ignored": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/hover-byval-option-explicit/src/Sources/Symbols.twin b/bugs/filed/hover-byval-option-explicit/src/Sources/Symbols.twin
deleted file mode 100644
index b1beae21d..000000000
--- a/bugs/filed/hover-byval-option-explicit/src/Sources/Symbols.twin
+++ /dev/null
@@ -1,8 +0,0 @@
-' Hover over the parameters where Probe2 uses them. project.optionExplicit is true.
-Module Symbols
-    Public Sub Probe2(ByVal h As Host, ByVal count As Long, ByVal col As Collection, _
-                      ByVal o As Object, ByVal v As Variant, ByRef r As Host, ByVal s As String)
-        Dim d As Host
-        Debug.Print h Is Nothing, count, col Is Nothing, o Is Nothing, IsEmpty(v), r Is Nothing, s, d Is Nothing
-    End Sub
-End Module
diff --git a/bugs/filed/index-error-numbers/REPORT.md b/bugs/filed/index-error-numbers/REPORT.md
deleted file mode 100644
index 74ef83ae1..000000000
--- a/bugs/filed/index-error-numbers/REPORT.md
+++ /dev/null
@@ -1,36 +0,0 @@
-Filed as [twinbasic/twinbasic#2440](https://github.com/twinbasic/twinbasic/issues/2440).
-
-## An out-of-range index raises `&H8002000B` or `&H80004005`, not VBA's error 9
-
-**Describe the bug**
-An array or `Collection` index that is out of range raises -2147352565 (`&H8002000B`, *Invalid index.*) or -2147467259 (`&H80004005`, *Unspecified error*). VBA raises error 9, *Subscript out of range*, so code that handles `Err.Number = 9` does not recognise the error. There is no diagnostic.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `index-error-numbers.twinproj` (attached as `index-error-numbers.zip`) and run it (F5). Its `Sub Main` holds the whole bug:
-   ```
-   Dim a(5) As Long
-   On Error Resume Next
-   a(7) = 1
-   Debug.Print Err.Number, Hex$(Err.Number), Err.Description
-   ```
-2. See `-2147352565  8002000B  Invalid index.` for this case. The project goes on to try the other cases, one line each:
-
-   | access | twinBASIC | VBA, per VBA-Docs' *Subscript out of range (Error 9)* |
-   |---|---|---|
-   | past a fixed or dynamic array's bound, a `Variant` array's, or `Split("x y")(5)` | -2147352565 (`8002000B`) *Invalid index.* | 9 |
-   | an element of an array never dimensioned: `Dim u() As Integer: u(8) = 234`, VBA-Docs' own example | -2147467259 (`80004005`) *Unspecified error* | 9 |
-   | a `Collection` member by a missing index or key | -2147467259 *Unspecified error* | 9 for a missing member |
-   | `Forms(99)`, `Forms.Item(-1)` | -2147467259 *Unspecified error* | --- |
-
-**Expected behavior**
-Error 9, as in VBA, for each of these. `Err.Raise 9` already gives 9 with the description *Subscript out of range*.
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-Also on BETA 983, in the IDE and in a compiled EXE alike. Severity: VBA code that handles `Err.Number = 9` does not recognise the error, with no diagnostic. What does not reproduce it: `UBound` of an erased array, `Printers(99)` and `Err.Raise 9` all give 9, and division by zero gives 11. The IDE's run-time error panel shows the same number `Err.Number` holds, for the array case. An erased array behaves as one never dimensioned: `-2147467259` for an element, 9 from `LBound` and `UBound`. `Printers` raises 9 past its end but `-2147467259` for a negative index and for an unknown name. The description of `-2147467259` varies between runs: *Unspecified error* in one, *Automation error* in another. The project's output on BETA 995 matches the table's first three rows; the `Forms` row and the other facts in this paragraph are from earlier runs of the same kind, not re-run for this report.
-
-<!-- Stated by docs/Reference/Default/VBA/ErrObject/Number.md (the table of error numbers that differ from VBA) and by docs/Reference/Core/On-Error.md; when fixed, update both. Measured with scripts/bug_repro.mjs (run mode, verify) on 995; earlier by compile probes through tbrun, in the IDE and as a built EXE on 983. -->
diff --git a/bugs/filed/index-error-numbers/index-error-numbers.twinproj b/bugs/filed/index-error-numbers/index-error-numbers.twinproj
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GIT binary patch
literal 0
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diff --git a/bugs/filed/index-error-numbers/repro.json b/bugs/filed/index-error-numbers/repro.json
deleted file mode 100644
index d06f67c3a..000000000
--- a/bugs/filed/index-error-numbers/repro.json
+++ /dev/null
@@ -1,12 +0,0 @@
-{
-  "mode": "run",
-  "expect": {
-    "exit": 0,
-    "output": [
-      "^a\\(7\\) = 1, past a fixed array: -2147352565 +8002000B ",
-      "^u\\(8\\) = 234, an array never dimensioned: -2147467259 +80004005 ",
-      "^c\\(5\\), a missing Collection index: -2147467259 +80004005 "
-    ]
-  },
-  "issue": 2440
-}
diff --git a/bugs/filed/index-error-numbers/src/Settings b/bugs/filed/index-error-numbers/src/Settings
deleted file mode 100644
index f41aba416..000000000
--- a/bugs/filed/index-error-numbers/src/Settings
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "IndexErrorNumbers",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard EXE",
-	"project.description": "Reproduces: An out-of-range index raises `&H8002000B` or `&H80004005`, not VBA's error 9",
-	"project.exportPathIsV2": true,
-	"project.id": "{D19A71F3-2CAA-4DC8-89B9-102978B7BB28}",
-	"project.name": "IndexErrorNumbers",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"symbolId": "stdole",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "VB",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 31
-		},
-		{
-			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "AppGlobalClassProject",
-			"versionBuild": 0,
-			"versionMajor": 1,
-			"versionMinor": 0,
-			"versionRevision": 0
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.startupObject": "Sub Main",
-	"project.warnings": {
-		"errors": [],
-		"hints": [],
-		"ignored": [],
-		"info": [],
-		"warnings": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/index-error-numbers/src/Sources/Startup.twin b/bugs/filed/index-error-numbers/src/Sources/Startup.twin
deleted file mode 100644
index 633132048..000000000
--- a/bugs/filed/index-error-numbers/src/Sources/Startup.twin
+++ /dev/null
@@ -1,38 +0,0 @@
-' An out-of-range index raises &H8002000B or &H80004005, where VBA raises error 9.
-Module Startup
-
-    Private Sub Show(ByVal what As String)
-        Debug.Print what; ": "; Err.Number; " "; Hex$(Err.Number); " "; Err.Description
-        Err.Clear
-    End Sub
-
-    Public Sub Main()
-        On Error Resume Next
-
-        Dim a(5) As Long
-        a(7) = 1
-        Show "a(7) = 1, past a fixed array"                 ' VBA: 9
-
-        Dim v As Variant = Array(1, 2, 3)
-        v(9) = 1
-        Show "v(9) = 1, past a Variant array"               ' VBA: 9
-
-        Dim s As String = Split("x y")(5)
-        Show "Split(""x y"")(5)"                            ' VBA: 9
-
-        Dim u() As Integer
-        u(8) = 234
-        Show "u(8) = 234, an array never dimensioned"       ' VBA: 9
-
-        Dim c As New Collection
-        c.Add 1, "one"
-        v = c(5)
-        Show "c(5), a missing Collection index"             ' VBA: 9
-        v = c("nokey")
-        Show "c(""nokey""), a missing Collection key"
-
-        Err.Raise 9
-        Show "Err.Raise 9"                                  ' 9
-    End Sub
-
-End Module
diff --git a/bugs/filed/lset-variant-array-element-noop/REPORT.md b/bugs/filed/lset-variant-array-element-noop/REPORT.md
index e509eb70f..515611a1c 100644
--- a/bugs/filed/lset-variant-array-element-noop/REPORT.md
+++ b/bugs/filed/lset-variant-array-element-noop/REPORT.md
@@ -28,4 +28,4 @@ Severity: low to medium. A statement that has no effect and no error is easy to
 
 Tried: `ReDim v2(0 To 1)` on a `Variant`, then `LSet v2(0) = "zz"`, does the same. The `w` elements and `Dim a(0 To 2) As String` elements work. On BETA 983 the `v` lines read the same, and the `w` line for `LSet` reads `[zz23456789]`, because `LSet` did not yet fill with spaces there (fixed in BETA 984, which is a separate matter).
 
-<!-- Reproducer: bugs/lset-variant-array-element-noop/ (mode run, expects the four lines above); verified on 995, 983 gives the same `v` lines. docs/Reference/Core/LSet.md and RSet.md each carry a WARNING naming BETA 995 for this, after the paragraph that says the destination can be a Variant that holds a string; when fixed, replace each with a NOTE saying since which build. -->
+<!-- Reproducer: bugs/lset-variant-array-element-noop/ (mode run, expects the four lines above); verified on 995, 983 gives the same `v` lines. docs/Reference/Core/LSet.md and RSet.md each carry a WARNING naming BETA 995 for this, after the paragraph that says the destination can be a Variant that holds a string; when fixed, remove each. -->
diff --git a/bugs/filed/populatefrom-no-args/REPORT.md b/bugs/filed/populatefrom-no-args/REPORT.md
deleted file mode 100644
index dd02a849f..000000000
--- a/bugs/filed/populatefrom-no-args/REPORT.md
+++ /dev/null
@@ -1,39 +0,0 @@
-Filed as [twinbasic/twinbasic#2450](https://github.com/twinbasic/twinbasic/issues/2450).
-
-## `[PopulateFrom]` with no arguments crashes the compiler
-
-**Describe the bug**
-An `Enum` marked `[PopulateFrom]` with no argument list crashes the compiler while the project is parsed. `tbbuild` reports it as a crash, `the compiler crashed 2x -- this project takes it down`, `last parsing: CrashProbe.twin`. A person who forgets the arguments is not told what is missing.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `populatefrom-no-args.twinproj` (attached as `populatefrom-no-args.zip`). Its one source file, `Probe.twin`, holds the whole bug:
-   ```
-   Public Module CrashProbe
-       [PopulateFrom]
-       Public Enum E
-       End Enum
-   End Module
-   ```
-2. See the compiler crash and restart while the project is parsed.
-
-The body of the Enum does not matter: the same crash comes with a member in it, and with the Enum inside a Class instead of a Module. The documented shape is five strings, `("json", "/Resources/PROBE/Strings.json", "events", "name", "id")`, and the other wrong shapes tried are handled:
-
-| argument list | result |
-|---|---|
-| none, `[PopulateFrom]` | **the compiler crashes** |
-| `(True)`, `(False)`, `(1)` | TB5155 `This attribute is not supported in this context` |
-| `("probe")`, on the reproduction above | TB5083 `unsupported data source` |
-| the documented five strings, with a resource that exists | compiles |
-
-**Expected behavior**
-A diagnostic naming the missing arguments, as the other wrong argument lists get (TB5155 or TB5083), not a crash. A missing argument list is the one wrong shape that is not checked.
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-First seen on BETA 987; the reproducer crashes BETA 983 as well. Severity: the compiler process dies while the project is being parsed. The same project with `[PopulateFrom("probe")]` builds and reports the one TB5083 row. The rows for `(True)`, `(False)` and `(1)` come from a batch of probes, not from the reproducer.
-
-<!-- Reproducer: bugs/populatefrom-no-args/ (mode compile, expects tbbuild exit 4); verified on 995 and 983. Observed 2026-09-30 two ways: scripts/sweep_attributes.mjs builds every attribute at every declaration site in batches of 400 and halves a batch the compiler crashes on, and each of the three Enum sites (an Enum with a member, an empty Enum, an Enum in a Class) was narrowed to one probe beside the three canaries the tool adds to every batch, which build clean without it; the four-line reproduction was then built exactly as written, in a project holding only it and a two-line Sub Main, with no resources. The sweep tooling (scripts/sweep_attributes.mjs, its notes in WIP.Harness.md) meets the crash through the halving; when it is fixed, re-run the sweep for PopulateFrom and update whatever note records the crash. -->
diff --git a/bugs/filed/populatefrom-no-args/populatefrom-no-args.twinproj b/bugs/filed/populatefrom-no-args/populatefrom-no-args.twinproj
deleted file mode 100644
index 9d301c332e20a36d58c1c166214d5bbfac691f8a..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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diff --git a/bugs/filed/populatefrom-no-args/repro.json b/bugs/filed/populatefrom-no-args/repro.json
deleted file mode 100644
index 92e884327..000000000
--- a/bugs/filed/populatefrom-no-args/repro.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "mode": "compile",
-  "expect": {
-    "exit": 4
-  },
-  "issue": 2450
-}
diff --git a/bugs/filed/populatefrom-no-args/src/Settings b/bugs/filed/populatefrom-no-args/src/Settings
deleted file mode 100644
index 610bb3183..000000000
--- a/bugs/filed/populatefrom-no-args/src/Settings
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "PopulatefromNoArgs",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard EXE",
-	"project.description": "Reproduces: `[PopulateFrom]` with no arguments crashes the compiler",
-	"project.exportPathIsV2": true,
-	"project.id": "{283FE68E-EE87-4A38-97FD-E228E8D2CB5F}",
-	"project.name": "PopulatefromNoArgs",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"symbolId": "stdole",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "VB",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 31
-		},
-		{
-			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "AppGlobalClassProject",
-			"versionBuild": 0,
-			"versionMajor": 1,
-			"versionMinor": 0,
-			"versionRevision": 0
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.startupObject": "Sub Main",
-	"project.warnings": {
-		"errors": [],
-		"hints": [],
-		"ignored": [],
-		"info": [],
-		"warnings": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/populatefrom-no-args/src/Sources/Probe.twin b/bugs/filed/populatefrom-no-args/src/Sources/Probe.twin
deleted file mode 100644
index 3674040aa..000000000
--- a/bugs/filed/populatefrom-no-args/src/Sources/Probe.twin
+++ /dev/null
@@ -1,6 +0,0 @@
-' [PopulateFrom] with no argument list on an Enum: the compiler crashes while parsing this file.
-Public Module CrashProbe
-    [PopulateFrom]
-    Public Enum E
-    End Enum
-End Module
diff --git a/bugs/filed/populatefrom-no-args/src/Sources/Startup.twin b/bugs/filed/populatefrom-no-args/src/Sources/Startup.twin
deleted file mode 100644
index 20233b3a9..000000000
--- a/bugs/filed/populatefrom-no-args/src/Sources/Startup.twin
+++ /dev/null
@@ -1,6 +0,0 @@
-Module Startup
-
-    Public Sub Main()
-    End Sub
-
-End Module
diff --git a/bugs/filed/proper-case-even-separators/REPORT.md b/bugs/filed/proper-case-even-separators/REPORT.md
deleted file mode 100644
index da3f7dd82..000000000
--- a/bugs/filed/proper-case-even-separators/REPORT.md
+++ /dev/null
@@ -1,31 +0,0 @@
-Filed as [twinbasic/twinbasic#2464](https://github.com/twinbasic/twinbasic/issues/2464).
-
-## `StrConv` with `vbProperCase` leaves a word in lowercase when it follows an even number of separators
-
-**Describe the bug**
-`StrConv(s, vbProperCase)` capitalises the first letter of a word that follows one, three or five separator characters (space, tab, `vbCr`, `vbLf`, vertical tab, form feed, NUL), and a word at the start of the string. After two, four or six separators the word is left in lowercase, so every word after a `vbCrLf` in multi-line text stays lowercase, and so does the second word of `"a  b"` (two spaces). It is a regression: BETA 983 capitalised every word. Observed in a run of the reproducer project.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `proper-case-even-separators.twinproj` (attached as `proper-case-even-separators.zip`). Its one source file, `Startup.twin`, has a `Sub Main` that calls `StrConv` with `vbProperCase` on `"a b"`, `"a  b"`, `"a   b"` and `"a" & vbCrLf & "b"`.
-2. Run it (F5) and read the DEBUG CONSOLE:
-   ```
-   one space:    [A B]
-   two spaces:   [A  b]
-   three spaces: [A   B]
-   vbCrLf:       [A<CRLF>b]
-   ```
-
-**Expected behavior**
-Every word is capitalised, whatever the number of separators before it: `[A  B]` and `[A<CRLF>B]`. VB6 does so (attached as `proper-case-even-separators-vb6.zip`, which prints `[A  B]` and `[A<CRLF>B]`), and so does BETA 983.
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-Severity: medium. Text with a line break or with aligned columns comes out half capitalised, and nothing reports it.
-
-With `"a" & Space$(n) & "b" & Space$(n) & "c"`, n = 0 gives `Abc` and n = 1, 3 and 5 give every word capitalised; n = 2, 4 and 6 give `A`, then `b` and `c` in lowercase. A space followed by a tab counts as two separators, and `" a  b  c "` (one leading space) comes out as `" a  b  c "`, all lowercase. The result is the same with an explicit `LCID` of 1033. It looks as if each separator toggles a "capitalise the next letter" flag instead of setting it. BETA 983 and VB6 give the same result as each other for all of these.
-
-<!-- Reproducer: bugs/proper-case-even-separators/ (mode run, expects the four lines above); verified on 995, 983 gives `[A  B]` and `[A<CRLF>B]`. docs/Reference/Default/VBA/Strings/StrConv.md carries a WARNING about this ("BETA 995 has a defect in vbProperCase ..."); when fixed, replace it with a NOTE saying since which build. -->
diff --git a/bugs/filed/proper-case-even-separators/proper-case-even-separators.twinproj b/bugs/filed/proper-case-even-separators/proper-case-even-separators.twinproj
deleted file mode 100644
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GIT binary patch
literal 0
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diff --git a/bugs/filed/proper-case-even-separators/repro.json b/bugs/filed/proper-case-even-separators/repro.json
deleted file mode 100644
index 0693c751d..000000000
--- a/bugs/filed/proper-case-even-separators/repro.json
+++ /dev/null
@@ -1,13 +0,0 @@
-{
-  "mode": "run",
-  "expect": {
-    "exit": 0,
-    "output": [
-      "^one space:    \\[A B\\]$",
-      "^two spaces:   \\[A  b\\]$",
-      "^three spaces: \\[A   B\\]$",
-      "^vbCrLf:       \\[A<CRLF>b\\]$"
-    ]
-  },
-  "issue": 2464
-}
diff --git a/bugs/filed/proper-case-even-separators/src/Settings b/bugs/filed/proper-case-even-separators/src/Settings
deleted file mode 100644
index 17cad0c21..000000000
--- a/bugs/filed/proper-case-even-separators/src/Settings
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "ProperCaseEvenSeparators",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard EXE",
-	"project.description": "Reproduces: StrConv vbProperCase leaves a word in lowercase after an even number of separators",
-	"project.exportPathIsV2": true,
-	"project.id": "{003E64D6-B17F-4683-B01E-20DD325B7651}",
-	"project.name": "ProperCaseEvenSeparators",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"symbolId": "stdole",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "VB",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 31
-		},
-		{
-			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "AppGlobalClassProject",
-			"versionBuild": 0,
-			"versionMajor": 1,
-			"versionMinor": 0,
-			"versionRevision": 0
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.startupObject": "Sub Main",
-	"project.warnings": {
-		"errors": [],
-		"hints": [],
-		"ignored": [],
-		"info": [],
-		"warnings": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/proper-case-even-separators/src/Sources/Startup.twin b/bugs/filed/proper-case-even-separators/src/Sources/Startup.twin
deleted file mode 100644
index ce1283cc8..000000000
--- a/bugs/filed/proper-case-even-separators/src/Sources/Startup.twin
+++ /dev/null
@@ -1,10 +0,0 @@
-Module Startup
-
-    Public Sub Main()
-        Debug.Print "one space:    [" & StrConv("a b", vbProperCase) & "]"
-        Debug.Print "two spaces:   [" & StrConv("a  b", vbProperCase) & "]"
-        Debug.Print "three spaces: [" & StrConv("a   b", vbProperCase) & "]"
-        Debug.Print "vbCrLf:       [" & Replace(StrConv("a" & vbCrLf & "b", vbProperCase), vbCrLf, "<CRLF>") & "]"
-    End Sub
-
-End Module
diff --git a/bugs/filed/proper-case-even-separators/vb6/Module1.bas b/bugs/filed/proper-case-even-separators/vb6/Module1.bas
deleted file mode 100644
index d6befbbbe..000000000
--- a/bugs/filed/proper-case-even-separators/vb6/Module1.bas
+++ /dev/null
@@ -1,17 +0,0 @@
-Attribute VB_Name = "Module1"
-Option Explicit
-
-Sub Main()
-    On Error GoTo Fail
-    Open App.Path & "\out.txt" For Output As #9
-    Print #9, "one space:    [" & StrConv("a b", vbProperCase) & "]"
-    Print #9, "two spaces:   [" & StrConv("a  b", vbProperCase) & "]"
-    Print #9, "three spaces: [" & StrConv("a   b", vbProperCase) & "]"
-    Print #9, "vbCrLf:       [" & Replace(StrConv("a" & vbCrLf & "b", vbProperCase), vbCrLf, "<CRLF>") & "]"
-    Close #9
-    Exit Sub
-Fail:
-    On Error Resume Next
-    Print #9, "unhandled error " & Err.Number & ": " & Err.Description
-    Close #9
-End Sub
diff --git a/bugs/filed/proper-case-even-separators/vb6/Probe.vbp b/bugs/filed/proper-case-even-separators/vb6/Probe.vbp
deleted file mode 100644
index 4d210b0e8..000000000
--- a/bugs/filed/proper-case-even-separators/vb6/Probe.vbp
+++ /dev/null
@@ -1,7 +0,0 @@
-Type=Exe
-Module=Module1; Module1.bas
-Startup="Sub Main"
-ExeName32="Probe.exe"
-Name="Probe"
-CompilationType=0
-OptimizationType=0
diff --git a/bugs/filed/wv2-headers-foreach-crash/REPORT.md b/bugs/filed/wv2-headers-foreach-crash/REPORT.md
deleted file mode 100644
index e4fcd77a3..000000000
--- a/bugs/filed/wv2-headers-foreach-crash/REPORT.md
+++ /dev/null
@@ -1,36 +0,0 @@
-Filed as [twinbasic/twinbasic#2460](https://github.com/twinbasic/twinbasic/issues/2460).
-
-## For Each over WebView2 request or response headers crashes in WebView2HeadersCollection.Next
-
-**Describe the bug**
-`For Each` over the `WebView2RequestHeaders` that `NavigationStarting` receives crashes with an access violation in `WebView2HeadersCollection.Next`. `WebView2ResponseHeaders` returns the same enumerator from its `_NewEnum`, so `For Each` over response headers reaches the same code (not run). `For Each` calls `IEnumVARIANT::Next` with `pCeltFetched` set to a null pointer, which the interface allows, and the package's `Next` assigns to `pCeltFetched` without testing it. The DEBUG CONSOLE shows `NATIVE EXCEPTION: ACCESS_VIOLATION /WebView2HeadersCollection.twin; WebView2HeadersCollection.Next`.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `wv2-headers-foreach-crash.twinproj` (attached as `wv2-headers-foreach-crash.zip`). It references the WebView2 package and has one form, `Form1`, with one WebView2 control, `WebView21`. `Sub Main` shows the form modally. When the control is ready it navigates to `about:blank`, and its `NavigationStarting` handler goes through the request headers:
-   ```
-   Private Sub WebView21_NavigationStarting(ByVal Uri As String, ByVal IsUserInitiated As Boolean, _
-           ByVal IsRedirected As Boolean, ByVal RequestHeaders As WebView2RequestHeaders, _
-           Cancel As Boolean) Handles WebView21.NavigationStarting
-       Debug.Print "NavigationStarting " & Uri
-       Dim h As WebView2Header
-       For Each h In RequestHeaders
-           Debug.Print h.Name & ": " & h.Value
-       Next
-       Debug.Print "after For Each"
-   End Sub
-   ```
-2. Run the project (F5).
-3. See `NavigationStarting about:blank` in the DEBUG CONSOLE, and then `NATIVE EXCEPTION: ACCESS_VIOLATION /WebView2HeadersCollection.twin; WebView2HeadersCollection.Next`. `after For Each` is never printed.
-
-**Expected behavior**
-`For Each` yields each header, and the loop ends. The package's documentation shows this loop in a `NavigationStarting` handler. `Next` should assign to `pCeltFetched` only when its address is not zero, for example `If VarPtr(pCeltFetched) <> 0 Then pCeltFetched = 1`, in both places it assigns it.
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-Severity: medium; `For Each` is the documented way to read the headers, and it ends the program. Without the `For Each`, the same project navigates, closes the form and returns. The same project crashes the same way on BETA 983. Calling `Next` directly, through a copy of `IEnumVARIANT` with a variable for `pCeltFetched`, returns the headers and then the end; the crash needs the null pointer that `For Each` passes. The same null `pCeltFetched` from `For Each` was measured with an enumerator written in a project: an unguarded assignment fails with an access violation there too. `Reset`, which `For Each` calls first, returns `E_NOTIMPL` here, and `For Each` goes on to call `Next` regardless.
-
-<!-- Reproducer: bugs/wv2-headers-foreach-crash/, made with `bug_repro new --template webview2-form` (run mode: exit 5, the ACCESS_VIOLATION line, no "after For Each"); verified on 995 and 983 with bug_repro verify, 2026-10-03. Run in the harness, the control would not start (8007139F) until bug_repro's probe cleared the WEBVIEW2_* variables tb-ide.mjs gives the IDE; an IDE started by hand needs nothing. The direct-Next control was a fake iterator fed to New WebView2HeadersCollection, kept in the kit (s69/wv2-fake-repro/). The package source is WebView2Package's Sources/Classes/WebView2HeadersCollection.twin (export of the 995 install). docs/Features/Language/Custom-Enumerators.md and docs/Reference/COM-Interfaces/IEnumVARIANT.md state the null pCeltFetched rule. When fixed, remove the BETA 995 WARNING from docs/Reference/Built-In/WebView2/WebView2HeadersCollection.md (the full one) and the short ones on WebView2Header.md, WebView2RequestHeaders.md and WebView2ResponseHeaders.md. -->
diff --git a/bugs/filed/wv2-headers-foreach-crash/repro.json b/bugs/filed/wv2-headers-foreach-crash/repro.json
deleted file mode 100644
index dad8ae658..000000000
--- a/bugs/filed/wv2-headers-foreach-crash/repro.json
+++ /dev/null
@@ -1,14 +0,0 @@
-{
-  "mode": "run",
-  "expect": {
-    "exit": 5,
-    "output": [
-      "^NavigationStarting about:blank$",
-      "ACCESS_VIOLATION .*WebView2HeadersCollection\\.Next"
-    ],
-    "absent": [
-      "^after For Each$"
-    ]
-  },
-  "issue": 2460
-}
diff --git a/bugs/filed/wv2-headers-foreach-crash/src/Settings b/bugs/filed/wv2-headers-foreach-crash/src/Settings
deleted file mode 100644
index 852228161..000000000
--- a/bugs/filed/wv2-headers-foreach-crash/src/Settings
+++ /dev/null
@@ -1,75 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "Wv2HeadersForeachCrash",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard EXE",
-	"project.description": "Reproduces: For Each over WebView2 request or response headers crashes in WebView2HeadersCollection.Next",
-	"project.exportPathIsV2": true,
-	"project.id": "{6BD10F28-52EF-443F-AAE0-C288FDBC31CB}",
-	"project.name": "Wv2HeadersForeachCrash",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"symbolId": "stdole",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "VB",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 31
-		},
-		{
-			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "AppGlobalClassProject",
-			"versionBuild": 0,
-			"versionMajor": 1,
-			"versionMinor": 0,
-			"versionRevision": 0
-		},
-		{
-			"id": "{5D19653F-F49E-41F2-ABF8-16E473A89A7C}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] WebView2 Package",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "WebView2Package",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 3
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.startupObject": "Sub Main",
-	"project.warnings": {
-		"errors": [],
-		"hints": [],
-		"ignored": [],
-		"info": [],
-		"warnings": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/wv2-headers-foreach-crash/src/Sources/Form1.tbform b/bugs/filed/wv2-headers-foreach-crash/src/Sources/Form1.tbform
deleted file mode 100644
index 5610cc552..000000000
--- a/bugs/filed/wv2-headers-foreach-crash/src/Sources/Form1.tbform
+++ /dev/null
@@ -1,146 +0,0 @@
-[
-	{
-		"AlwaysShowKeyboardCues": false,
-		"Appearance": "vbAppear3d",
-		"AutoRedraw": false,
-		"BackColor": 13223074,
-		"BorderStyle": "vbSizable",
-		"Caption": "WebView2 form",
-		"ClipControls": true,
-		"ControlBox": true,
-		"DrawMode": "vbCopyPen",
-		"DrawStyle": "vbSolid",
-		"DrawWidth": 1,
-		"Enabled": true,
-		"FillColor": 0,
-		"FillStyle": "vbFSTransparent",
-		"FontBold": false,
-		"FontItalic": false,
-		"FontName": "Segoe UI",
-		"FontSize": 8,
-		"FontStrikethru": false,
-		"FontTransparent": true,
-		"FontUnderline": false,
-		"ForeColor": -2147483630,
-		"FormDesignerId": "{7B247400-0000-4000-9000-7B2474000F01}",
-		"HasDC": true,
-		"Height": 480,
-		"HelpContextID": 0,
-		"Icon": "",
-		"KeyPreview": false,
-		"Left": 0,
-		"LinkMode": "vbLinkNone",
-		"LinkTopic": null,
-		"MDIChild": false,
-		"MaxButton": true,
-		"MaxHeight": 0,
-		"MaxWidth": 0,
-		"MinButton": true,
-		"MinHeight": 0,
-		"MinWidth": 0,
-		"MouseIcon": "",
-		"MousePointer": "vbDefault",
-		"Moveable": true,
-		"Name": "Form1",
-		"NegotiateMenus": false,
-		"OLEDropMode": "vbOLEDropNone",
-		"Opacity": 100,
-		"Palette": "",
-		"PaletteMode": "vbPaletteModeHalftone",
-		"Picture": "",
-		"PictureDpiScaling": false,
-		"RightToLeft": false,
-		"ScaleHeight": 8560,
-		"ScaleLeft": 0,
-		"ScaleMode": "vbTwips",
-		"ScaleTop": 0,
-		"ScaleWidth": 11760,
-		"ShowInTaskbar": true,
-		"StartUpPosition": "vbStartUpScreen",
-		"TabFocusAutoSelect": false,
-		"Tag": null,
-		"Top": 0,
-		"TopMost": false,
-		"TransparencyKey": -1,
-		"Visible": true,
-		"WhatsThisButton": false,
-		"WhatsThisHelp": false,
-		"Width": 640,
-		"WindowState": "vbNormal",
-		"__IDEOptions": {
-			"alignToGrid": false,
-			"gridHeight": 10,
-			"gridWidth": 10,
-			"lockedControls": [],
-			"multiColoredGrabbers": true,
-			"showGrid": true,
-			"showOutlines": false
-		},
-		"__lastUpdateMarker": 3573907440,
-		"_children": [
-			{
-				"AdditionalAllowedFrameAncestors": null,
-				"Anchors": {
-					"Bottom": true,
-					"Left": true,
-					"Right": true,
-					"Top": true,
-					"_clsid": "{8524D4B5-72A9-40A9-A189-29E7905C40CA}"
-				},
-				"AreBrowserAcceleratorKeysEnabled": true,
-				"AreDefaultContextMenusEnabled": true,
-				"AreDefaultScriptDialogsEnabled": true,
-				"AreDevToolsEnabled": true,
-				"AreHostObjectsAllowed": true,
-				"BackColor": 10534293,
-				"CausesValidation": true,
-				"Dock": "vbDockNone",
-				"DocumentURL": "about:blank",
-				"DragIcon": "",
-				"DragMode": "vbManual",
-				"Enabled": true,
-				"EnvironmentOptions": {
-					"AdditionalBrowserArguments": null,
-					"AllowSingleSignOnUsingOSPrimaryAccount": false,
-					"BrowserExecutableFolder": null,
-					"EnableTrackingPrevention": true,
-					"ExclusiveUserDataFolderAccess": false,
-					"Language": null,
-					"TargetCompatibleBrowserVersion": "86.0.616.0",
-					"UserDataFolder": "",
-					"_className": "WebView2EnvironmentOptions",
-					"_clsid": "{185E63C0-E641-47ED-B6A9-8565168A7FCF}"
-				},
-				"Height": 440,
-				"Index": -1,
-				"IsBuiltInErrorPageEnabled": true,
-				"IsGeneralAutoFillEnabled": true,
-				"IsMuted": false,
-				"IsPasswordAutoSaveEnabled": false,
-				"IsPinchZoomEnabled": true,
-				"IsScriptEnabled": true,
-				"IsStatusBarEnabled": false,
-				"IsSwipeNavigationEnabled": true,
-				"IsWebMessageEnabled": true,
-				"IsZoomControlEnabled": true,
-				"Left": 0,
-				"MouseIcon": "",
-				"MousePointer": "vbDefault",
-				"Name": "WebView21",
-				"TabIndex": 7,
-				"TabStop": true,
-				"Tag": null,
-				"Top": 0,
-				"UseDeferredEvents": true,
-				"UserAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36 Edg/132.0.0.0",
-				"Visible": true,
-				"Width": 620,
-				"ZoomFactor": 1,
-				"_className": "WebView2",
-				"_clsid": "{93B7E07E-6C7F-4758-8E51-4B1B17EC0A62}"
-			}
-		],
-		"_className": "Form",
-		"_clsid": "{33AD4F38-6699-11CF-B70C-00AA0060D393}"
-	}
-]
diff --git a/bugs/filed/wv2-headers-foreach-crash/src/Sources/Form1.twin b/bugs/filed/wv2-headers-foreach-crash/src/Sources/Form1.twin
deleted file mode 100644
index b8dbc7895..000000000
--- a/bugs/filed/wv2-headers-foreach-crash/src/Sources/Form1.twin
+++ /dev/null
@@ -1,32 +0,0 @@
-' For Each over the request headers that NavigationStarting receives crashes
-' with an access violation in WebView2HeadersCollection.Next: For Each passes
-' Next a null pCeltFetched, and Next assigns to it without testing it.
-' Without the For Each, the form opens about:blank and closes, and Main returns.
-
-[FormDesignerId("7B247400-0000-4000-9000-7B2474000F01")]
-[PredeclaredId]
-Class Form1
-
-    Private Sub WebView21_Ready() Handles WebView21.Ready
-        Debug.Print "WebView21 ready"
-        WebView21.Navigate "about:blank"
-    End Sub
-
-    Private Sub WebView21_NavigationStarting(ByVal Uri As String, ByVal IsUserInitiated As Boolean, _
-            ByVal IsRedirected As Boolean, ByVal RequestHeaders As WebView2RequestHeaders, _
-            Cancel As Boolean) Handles WebView21.NavigationStarting
-        Debug.Print "NavigationStarting " & Uri
-        Dim h As WebView2Header
-        For Each h In RequestHeaders
-            Debug.Print h.Name & ": " & h.Value
-        Next
-        Debug.Print "after For Each"
-    End Sub
-
-    Private Sub WebView21_NavigationComplete(ByVal IsSuccess As Boolean, ByVal WebErrorStatus As Long) _
-            Handles WebView21.NavigationComplete
-        Debug.Print "NavigationComplete " & IsSuccess
-        Me.Close
-    End Sub
-
-End Class
diff --git a/bugs/filed/wv2-headers-foreach-crash/src/Sources/Startup.twin b/bugs/filed/wv2-headers-foreach-crash/src/Sources/Startup.twin
deleted file mode 100644
index 9d70f1799..000000000
--- a/bugs/filed/wv2-headers-foreach-crash/src/Sources/Startup.twin
+++ /dev/null
@@ -1,8 +0,0 @@
-Module Startup
-
-    Public Sub Main()
-        Form1.Show vbModal
-        Debug.Print "Form1 closed"
-    End Sub
-
-End Module
diff --git a/bugs/filed/wv2-headers-foreach-crash/wv2-headers-foreach-crash.twinproj b/bugs/filed/wv2-headers-foreach-crash/wv2-headers-foreach-crash.twinproj
deleted file mode 100644
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diff --git a/docs/Documentation/Authoring.md b/docs/Documentation/Authoring.md
index e19c4c90e..6b707602f 100644
--- a/docs/Documentation/Authoring.md
+++ b/docs/Documentation/Authoring.md
@@ -922,7 +922,7 @@ Three severities, used distinctly:
 - `> [!IMPORTANT]` --- requirements that affect correctness, such as admin rights, threading constraints, or ordering.
 - `> [!WARNING]` --- operations that can corrupt state or lose data.
 
-A known defect in twinBASIC follows the same scale. A defect that silently gives a wrong result --- a function that returns the wrong value and raises no error --- is a `> [!WARNING]` until a fixed build is released, because nothing tells the reader that their data is wrong. A defect that crashes the program is a `> [!WARNING]` too, because whatever it had not saved is lost. So is a defect whose error hides a silent part, such as a procedure that runs twice before the error is raised. A defect the reader cannot miss and that loses nothing, such as an error raised or a statement the compiler refuses, is a `> [!NOTE]`. Either callout names the build it applies to, and once a fixed build is out it becomes a `> [!NOTE]` saying since which build the behaviour is correct.
+A known defect in twinBASIC follows the same scale. A defect that silently gives a wrong result --- a function that returns the wrong value and raises no error --- is a `> [!WARNING]` until a fixed build is released, because nothing tells the reader that their data is wrong. A defect that crashes the program is a `> [!WARNING]` too, because whatever it had not saved is lost. So is a defect whose error hides a silent part, such as a procedure that runs twice before the error is raised. A defect the reader cannot miss and that loses nothing, such as an error raised or a statement the compiler refuses, is a `> [!NOTE]`. Either callout names the build it applies to. Once a fixed build is out, the callout is removed, and the page describes the correct behaviour with no mention of the defect: the documentation is not a record of past defects.
 
 Use one callout per concern, and reserve them for genuine notes --- plain "why this is useful" prose should stay a plain paragraph.
 
diff --git a/docs/Features/Advanced/Classes-and-Modules.md b/docs/Features/Advanced/Classes-and-Modules.md
index 925f0cf38..3a9ce74aa 100644
--- a/docs/Features/Advanced/Classes-and-Modules.md
+++ b/docs/Features/Advanced/Classes-and-Modules.md
@@ -16,7 +16,7 @@ A class can have a `Sub New` constructor, and the constructor can take arguments
 - `New MyClass(123)` runs `Sub New(Value As Long)`. `Class_Initialize` is not raised.
 - In a class that also has a `Class_Initialize`, a plain `New MyClass` runs `Class_Initialize`. `Sub New` does not run.
 - A class that has both a `Class_Initialize` and a `Sub New` with no parameters cannot be created with a plain `New`. The call matches both, and fails with TB5073.
-- A class whose only `Sub New` takes arguments, with no `Class_Initialize`, cannot be declared [`As New`](../../tB/Core/New), which creates the object without arguments. The declaration fails with TB5121. This holds even when every argument is `Optional`.
+- A class whose only `Sub New` has required arguments, with no `Class_Initialize`, cannot be declared [`As New`](../../tB/Core/New), which creates the object without arguments. The declaration fails with TB5121. If every argument of the `Sub New` is `Optional`, the class can be declared `As New`: the object is created by calling `Sub New` with the default values.
 
 ### Example
 
diff --git a/docs/Features/Language/Inheritance.md b/docs/Features/Language/Inheritance.md
index bb81c7091..dd2db9f13 100644
--- a/docs/Features/Language/Inheritance.md
+++ b/docs/Features/Language/Inheritance.md
@@ -60,7 +60,7 @@ This option supports full inheritance and OOP: `Protected` methods and variables
 ### Example: Animal Class Hierarchy
 
 > [!IMPORTANT]
-> Every class in this example is declared `Private Class`, because each one has a `Sub New` that takes arguments. A class that is not `Private` is exposed to COM, and COM creates objects without arguments. So a public class --- base or derived --- whose `Sub New` takes arguments fails to compile with TB5135, unless it also has a constructor that takes none. There are three fixes: declare the class `Private`, add the `[COMCreatable(False)]` attribute, or add a constructor without arguments, such as `Class_Initialize`. Only the third lets the class be declared `As New`; without it, `As New` fails with TB5121. See [Parameterized Class Constructors](../Advanced/Classes-and-Modules#parameterized-class-constructors).
+> Every class in this example is declared `Private Class`, because each one has a `Sub New` that takes arguments. A class that is not `Private` is exposed to COM, and COM creates objects without arguments. So a public class --- base or derived --- whose `Sub New` has required arguments fails to compile with TB5135, unless it also has a constructor that takes none. There are three fixes: declare the class `Private`, add the `[COMCreatable(False)]` attribute, or add a constructor without arguments, such as `Class_Initialize`. Only the third lets the class be declared `As New`; without it, `As New` fails with TB5121. See [Parameterized Class Constructors](../Advanced/Classes-and-Modules#parameterized-class-constructors).
 
 Starting with a base class:
 
diff --git a/docs/IDE/Menu/Debug.md b/docs/IDE/Menu/Debug.md
index f69ce63b4..85a22994c 100644
--- a/docs/IDE/Menu/Debug.md
+++ b/docs/IDE/Menu/Debug.md
@@ -54,11 +54,11 @@ End Sub
 
 The editor opens the module, highlights the whole failing line, `a(idx) = i * 10`, and puts a yellow arrow in the margin beside it. Under the line, an error panel shows:
 
-- **Run-time error -2147352565 (8002000B)**: the error number, then the same number in hexadecimal;
-- **DESCRIPTION:** and the error's description, here *Invalid index.*;
+- **Run-time error 9 (00000009)**: the error number, then the same number in hexadecimal;
+- **DESCRIPTION:** and the error's description, here *Subscript out of range*;
 - four buttons: **Try Again (Resume)**, **Ignore (Resume Next)**, **Stop** and **Search Online**.
 
-The number is the one `Err.Number` holds, and for some errors it is not the number VBA uses: see [Error numbers that differ from VBA](../../../Modules/ErrObject/Number#error-numbers-that-differ-from-vba). Nothing about the error is written to the [Debug Console](../DebugConsole). The panel's **×** only hides the panel.
+The number is the one `Err.Number` holds. Nothing about the error is written to the [Debug Console](../DebugConsole). The panel's **×** only hides the panel.
 
 The other panes show the state of the program at the failing line:
 
diff --git a/docs/IDE/Menu/File.md b/docs/IDE/Menu/File.md
index 06ce190f7..bed8b4c0f 100644
--- a/docs/IDE/Menu/File.md
+++ b/docs/IDE/Menu/File.md
@@ -34,7 +34,7 @@ permalink: /tB/IDE/Project/Menu/File
 
 Writes the open project out to a folder as separate files, instead of the single `.twinproj` file. The folder gets the project's `Settings` file, its `Sources`, `Resources` and other folders, and a `Packages` folder with the full source of every package the project references. For a small project that uses the **VB** package, the export held 477 files: two of the project's own, and 475 under `Packages`. <kbd>CTRL</kbd> + <kbd>E</kbd> runs the same command.
 
-**Before it writes anything, the command deletes everything already in the target folder.** It does not ask first, and the deleted files do not go to the Recycle Bin. Files that have nothing to do with the project are deleted too: hidden files, a `.git` folder, anything else there. A directory junction inside the folder is followed, and the files in the folder it points to are deleted as well.
+**Before it writes anything, the command deletes everything already in the target folder.** It does not ask first, and the deleted files do not go to the Recycle Bin. Files that have nothing to do with the project are deleted too: hidden files, a `.git` folder, anything else there.
 
 > [!WARNING]
 > Point **Export Project** only at a folder that holds nothing but an earlier export of the same project. Never point it at a folder that holds anything else, at the top folder of a Git repository, or at the folder that holds the `.twinproj` file.
diff --git a/docs/Reference/Attributes.md b/docs/Reference/Attributes.md
index 5b7778dcd..b15c80d7b 100644
--- a/docs/Reference/Attributes.md
+++ b/docs/Reference/Attributes.md
@@ -160,7 +160,7 @@ Syntax: **[COMCreatable** [ **( True** \| **False )** ] **]**
 
 Applicable to:  [**Class**](Class), [**CoClass**](CoClass)
 
-Indicates whether the class can be created through COM. It does not govern [**New**](New) inside the project: a `[COMCreatable(False)]` class is created with **New** as usual. A COM-creatable class needs a constructor that takes no arguments, so a class whose only `Sub New` takes arguments fails with TB5135 --- *error generating implicit default constructor ... (for COM exposure)* --- unless it is marked `[COMCreatable(False)]`, is **Private**, or has a constructor without arguments as well. The first two fixes leave the class with no constructor that takes no arguments, so it still cannot be declared [**As New**](New): that fails with TB5121. See [Parameterized Class Constructors](../../Features/Advanced/Classes-and-Modules#parameterized-class-constructors).
+Indicates whether the class can be created through COM. It does not govern [**New**](New) inside the project: a `[COMCreatable(False)]` class is created with **New** as usual. A COM-creatable class needs a constructor that takes no arguments, so a class whose only `Sub New` has required arguments fails with TB5135 --- *error generating implicit default constructor ... (for COM exposure)* --- unless it is marked `[COMCreatable(False)]`, is **Private**, or has a constructor without arguments as well. The first two fixes leave the class with no constructor that takes no arguments, so it still cannot be declared [**As New**](New): that fails with TB5121. See [Parameterized Class Constructors](../../Features/Advanced/Classes-and-Modules#parameterized-class-constructors).
 
 ## ComExport  (optional Bool)
 {: #comexport }
diff --git a/docs/Reference/Built-In/WebView2/WebView2Header.md b/docs/Reference/Built-In/WebView2/WebView2Header.md
index 376af0106..27bf15c9b 100644
--- a/docs/Reference/Built-In/WebView2/WebView2Header.md
+++ b/docs/Reference/Built-In/WebView2/WebView2Header.md
@@ -10,9 +10,6 @@ has_toc: false
 
 A single HTTP header --- a name / value pair. **WebView2Header** is the element type produced by iterating a [**WebView2HeadersCollection**](WebView2HeadersCollection), which in turn comes from a [**WebView2RequestHeaders**](WebView2RequestHeaders) or [**WebView2ResponseHeaders**](WebView2ResponseHeaders) collection.
 
-> [!WARNING]
-> In BETA 995, the `For Each` loop below ends the program with an access violation. See [**WebView2HeadersCollection**](WebView2HeadersCollection) for the cause and what to use instead.
-
 ```tb check_build
 Private Sub WebView21_WebResourceRequested( _
         ByVal Request As WebView2Request, _
diff --git a/docs/Reference/Built-In/WebView2/WebView2HeadersCollection.md b/docs/Reference/Built-In/WebView2/WebView2HeadersCollection.md
index bd6ded937..861ec2bdd 100644
--- a/docs/Reference/Built-In/WebView2/WebView2HeadersCollection.md
+++ b/docs/Reference/Built-In/WebView2/WebView2HeadersCollection.md
@@ -12,9 +12,6 @@ An enumerator that yields [**WebView2Header**](WebView2Header) values one by one
 
 The collection is forward-only: once iterated it is exhausted. It does not implement **Reset**, **Skip**, or **Clone**, and calling those raises run-time error 80004001 (*Not implemented*).
 
-> [!WARNING]
-> In BETA 995, a `For Each` loop over the collection, such as the one below, ends the program with an access violation in the collection's **Next**. `For Each` passes **Next** a null pointer for the count of items it returned, as [**IEnumVARIANT**](../../../Reference/COM-Interfaces/IEnumVARIANT) allows, and **Next** writes to it without checking. Until this is fixed, read the headers needed by name with **GetHeader** or **Contains** on [**WebView2RequestHeaders**](WebView2RequestHeaders) or [**WebView2ResponseHeaders**](WebView2ResponseHeaders).
-
 ```tb check_build
 Private Sub WebView21_NavigationStarting( _
         ByVal Uri As String, _
diff --git a/docs/Reference/Built-In/WebView2/WebView2RequestHeaders.md b/docs/Reference/Built-In/WebView2/WebView2RequestHeaders.md
index ba61ca0d1..d031a1482 100644
--- a/docs/Reference/Built-In/WebView2/WebView2RequestHeaders.md
+++ b/docs/Reference/Built-In/WebView2/WebView2RequestHeaders.md
@@ -15,9 +15,6 @@ The mutable HTTP-request-header collection for a navigation or a web-resource re
 
 The collection is enumerable: a `For Each` loop yields one [**WebView2Header**](WebView2Header) per entry.
 
-> [!WARNING]
-> In BETA 995, `For Each` over the collection ends the program with an access violation. See [**WebView2HeadersCollection**](WebView2HeadersCollection) for the cause and what to use instead.
-
 ```tb check_build
 Private Sub WebView21_NavigationStarting( _
         ByVal Uri As String, _
diff --git a/docs/Reference/Built-In/WebView2/WebView2ResponseHeaders.md b/docs/Reference/Built-In/WebView2/WebView2ResponseHeaders.md
index 1ecd09494..4f2798164 100644
--- a/docs/Reference/Built-In/WebView2/WebView2ResponseHeaders.md
+++ b/docs/Reference/Built-In/WebView2/WebView2ResponseHeaders.md
@@ -12,9 +12,6 @@ The HTTP-response-header collection for a web-resource response. Reached through
 
 The collection is enumerable --- `For Each` yields one [**WebView2Header**](WebView2Header) per entry. Unlike the request side, **AppendHeader** appends additional values rather than overwriting the existing one, matching HTTP's allowance of repeated response headers (e.g. multiple `Set-Cookie`).
 
-> [!WARNING]
-> In BETA 995, `For Each` over the collection ends the program with an access violation. See [**WebView2HeadersCollection**](WebView2HeadersCollection) for the cause and what to use instead.
-
 ```tb check_build
 Private Sub WebView21_WebResourceRequested( _
         ByVal Request As WebView2Request, _
diff --git a/docs/Reference/COM-Interfaces/IConnectionPoint.md b/docs/Reference/COM-Interfaces/IConnectionPoint.md
index cfbfbcaf3..1a4b11f5a 100644
--- a/docs/Reference/COM-Interfaces/IConnectionPoint.md
+++ b/docs/Reference/COM-Interfaces/IConnectionPoint.md
@@ -83,7 +83,7 @@ Private Interface IEnumConnections Extends stdole.IUnknown
 End Interface
 ```
 
-*ppCP* and *rgcd* name the first element of the caller's array and nothing after it, which is enough to ask for one item at a time. The enumerators of this page return one item per call whatever the count asked for (see [The enumerators](#the-enumerators)).
+*ppCP* and *rgcd* name the first element of the caller's array and nothing after it, which is enough to ask for one item at a time (see [The enumerators](#the-enumerators)).
 
 The identifier of the outgoing interface of a class written in twinBASIC is not a fixed value, so a program never declares it. It reads the identifier from the connection point (see [Events in twinBASIC](#events-in-twinbasic)).
 
@@ -185,16 +185,11 @@ Raises `CONNECT_E_NOCONNECTION` (`&H80040200`) when the object has no outgoing i
 
 ## The enumerators
 
-**IEnumConnectionPoints** and **IEnumConnections** follow the pattern of [**IEnumVARIANT**](IEnumVARIANT): **Next**, **Skip**, **Reset** and **Clone**. In BETA 995 the two enumerators that twinBASIC supplies do not follow it in the same way, so a caller reads each one as described here. Both are read one item at a time, with *cConnections* of 1.
+**IEnumConnectionPoints** and **IEnumConnections** follow the pattern of [**IEnumVARIANT**](IEnumVARIANT): **Next**, **Skip**, **Reset** and **Clone**. The two enumerators that twinBASIC supplies follow it.
 
-| Method | **IEnumConnectionPoints** | **IEnumConnections** |
-|--------|---------------------------|----------------------|
-| **Next** | Returns one item and `S_OK`. When no item is left, raises `E_FAIL` (`&H80004005`) and sets *pcFetched* to 0, where the contract returns `S_FALSE`. Asking for more items than are left also raises `E_FAIL`. | Returns one item and `S_OK`, even when more were asked for and more are left. When no item is left, writes nothing, sets *pcFetched* to 0 and returns `S_FALSE`, so a loop ends when *pcFetched* is 0. A null *pcFetched* is accepted. |
-| **Skip** | Raises `E_NOTIMPL` (`&H80004001`). | Moves past the items. |
-| **Reset** | Moves back to the start. | Moves back to the start. |
-| **Clone** | Raises `E_NOTIMPL`. | Returns a new enumerator, which reads on its own. |
+**Next** returns the items asked for, or the items that are left when there are fewer, and sets *pcFetched* to the number it returned. When no item is left, it writes nothing, sets *pcFetched* to 0 and raises no error, so a loop ends when *pcFetched* is 0. For **IEnumConnections**, asking for two items when two connections exist returns both. **IEnumConnections** also accepts a null *pcFetched*.
 
-A caller that asks for several items at once from **IEnumConnections** therefore gets only the first, and must call again. A caller that reads **IEnumConnectionPoints** handles the error of the call that finds the end.
+**Skip** raises no error, and **Reset** moves back to the start. **Clone** of **IEnumConnectionPoints** returns an enumerator and raises no error; **Clone** of **IEnumConnections** returns a new enumerator, which reads on its own.
 
 ## Events in twinBASIC
 
@@ -309,7 +304,7 @@ Debug.Print ConnectionCount(point)
 ' 0
 ```
 
-A class with events has one connection point, and the container finds it again by the identifier it reports. The enumerator has no second item: its **Next** raises `E_FAIL`. A class with no events fails in **EnumConnectionPoints** with run-time error 445. An identifier that the object does not have, here that of **IUnknown**, raises `CONNECT_E_NOCONNECTION`:
+A class with events has one connection point, and the container finds it again by the identifier it reports. The enumerator has no second item: its **Next** raises no error and sets *fetched* to 0. A class with no events fails in **EnumConnectionPoints** with run-time error 445. An identifier that the object does not have, here that of **IUnknown**, raises `CONNECT_E_NOCONNECTION`:
 
 ```tb check_run projname=com-iconnpoint
 Dim c As New Counter
@@ -328,8 +323,7 @@ Debug.Print back Is container                              ' True
 
 On Error Resume Next
 points.Next 1, point, fetched
-Debug.Print Hex$(Err.Number)                               ' 80004005
-Err.Clear
+Debug.Print fetched                                        ' 0
 
 Dim other As GUID           ' the identifier of IUnknown
 other.Data4(0) = &HC0
diff --git a/docs/Reference/Core/Graphics-Methods.md b/docs/Reference/Core/Graphics-Methods.md
index 3de75919a..c4eb9e477 100644
--- a/docs/Reference/Core/Graphics-Methods.md
+++ b/docs/Reference/Core/Graphics-Methods.md
@@ -132,10 +132,7 @@ The six drawing classes of the VB package implement these methods. [**Printer**]
 - **Line** without flag 4 starts at (**CurrentX**, **CurrentY**). **Step** on the first point adds those values to it. **Step** on the second point is relative to the first point, or to (**CurrentX**, **CurrentY**) when there is no first point. Afterwards (**CurrentX**, **CurrentY**) is the end point.
 - **B** draws a rectangle outline using [**FillColor**](../Packages/VB/Form/#fillcolor) and [**FillStyle**](../Packages/VB/Form/#fillstyle) for the interior. **BF** draws a solid rectangle in the line colour.
 - **PSet** with **Step** adds (**CurrentX**, **CurrentY**) to the point. Afterwards (**CurrentX**, **CurrentY**) is the point.
-- **Circle** with **Step** adds (**CurrentX**, **CurrentY**) to the centre, and afterwards (**CurrentX**, **CurrentY**) is the centre. Without *Start* and *End* it draws a full ellipse, filled with [**FillColor**](../Packages/VB/Form/#fillcolor) and [**FillStyle**](../Packages/VB/Form/#fillstyle). *Start* and *End* are angles in radians, counter-clockwise from the 3 o'clock position. A negative angle is used as its absolute value, and the radius from the centre to that end of the arc is drawn as well. When both are negative the shape is a pie, filled like the ellipse; an arc with one radius or none is not filled. A negative zero is zero and draws no radius, so a pie that starts at angle 0 is written with a *Start* of `-2 * pi`. A negative angle below -2 pi raises error 5 and draws nothing. With flag 256 clear, *Aspect* is ignored.
-
-> [!WARNING]
-> BETA 995 does not check a positive *Start* or *End*. VB6 raises error 5 for an angle above 2 pi and draws nothing. BETA 995 raises no error and draws the arc as if 2 pi had been subtracted, so `Form1.Circle (100, 100), 50, , 7, 1` draws a short arc where VB6 stops with an error. Keep both angles between -2 pi and 2 pi.
+- **Circle** with **Step** adds (**CurrentX**, **CurrentY**) to the centre, and afterwards (**CurrentX**, **CurrentY**) is the centre. Without *Start* and *End* it draws a full ellipse, filled with [**FillColor**](../Packages/VB/Form/#fillcolor) and [**FillStyle**](../Packages/VB/Form/#fillstyle). *Start* and *End* are angles in radians, counter-clockwise from the 3 o'clock position. A negative angle is used as its absolute value, and the radius from the centre to that end of the arc is drawn as well. When both are negative the shape is a pie, filled like the ellipse; an arc with one radius or none is not filled. A negative zero is zero and draws no radius, so a pie that starts at angle 0 is written with a *Start* of `-2 * pi`. An angle, positive or negative, whose magnitude exceeds 2 pi raises error 5 and draws nothing. With flag 256 clear, *Aspect* is ignored.
 
 For example, after `Form1.PSet (100, 100)` followed by `Form1.PSet Step(3, 4)`, the position is (103, 104). A call through an **As Object** variable draws in the same way.
 
diff --git a/docs/Reference/Core/New.md b/docs/Reference/Core/New.md
index d20608d59..e906170fc 100644
--- a/docs/Reference/Core/New.md
+++ b/docs/Reference/Core/New.md
@@ -28,7 +28,7 @@ Syntax:
 : A class name or other creatable object type. **New** can't be used to create new instances of any intrinsic data type (such as **Long** or **String**), and can't be used to create dependent objects.
 
 *arglist*
-: *optional* (twinBASIC) The arguments passed to the class's **Sub New** constructor, separated by commas --- `New Dog("Rex")`. The class must declare a **Sub New** whose parameters match; see [Parameterized Class Constructors](../../Features/Advanced/Classes-and-Modules#parameterized-class-constructors). The **As New** form takes no arguments: `Dim d As New Dog("Rex")` is a syntax error. So **As New** needs a class that can be created without arguments: one with a **Sub New** that takes none, or a `Class_Initialize`. For a class whose only **Sub New** takes arguments --- even if every argument is **Optional** --- **As New** fails with TB5121, *can't use this type with As-New syntax as it doesn't have a parameterless constructor*. In BETA 995, a **Static** variable in a module procedure can take them in an initializer only when the class is declared earlier in the project: `Static d As Dog = New Dog("Rex")` fails with TB5074 when **Dog** is declared later --- in a file that comes later in the project, or lower in the same file. **Dim** with the same initializer, and a **Static** in a class method, compile in either order. So that the code does not depend on file order, declare the **Static** variable, then assign it with **Set**.
+: *optional* (twinBASIC) The arguments passed to the class's **Sub New** constructor, separated by commas --- `New Dog("Rex")`. The class must declare a **Sub New** whose parameters match; see [Parameterized Class Constructors](../../Features/Advanced/Classes-and-Modules#parameterized-class-constructors). The **As New** form takes no arguments: `Dim d As New Dog("Rex")` is a syntax error. So **As New** needs a class that can be created without arguments: one with a **Sub New** that takes none or whose parameters are all **Optional** (the object is created by calling **Sub New** with the default values), or one with a `Class_Initialize`. For a class whose only **Sub New** has required arguments, **As New** fails with TB5121, *can't use this type with As-New syntax as it doesn't have a parameterless constructor*. In BETA 995, a **Static** variable in a module procedure can take them in an initializer only when the class is declared earlier in the project: `Static d As Dog = New Dog("Rex")` fails with TB5074 when **Dog** is declared later --- in a file that comes later in the project, or lower in the same file. **Dim** with the same initializer, and a **Static** in a class method, compile in either order. So that the code does not depend on file order, declare the **Static** variable, then assign it with **Set**.
 
 When **New** is used in a declaration, no instance is created at the point of declaration. Instead, an instance is created automatically the first time the variable is referenced after declaration. Each time the variable is set to **Nothing** and then referenced again, a new instance is created.
 
diff --git a/docs/Reference/Core/On-Error.md b/docs/Reference/Core/On-Error.md
index c184ed1cf..34d492840 100644
--- a/docs/Reference/Core/On-Error.md
+++ b/docs/Reference/Core/On-Error.md
@@ -36,9 +36,6 @@ Each time the error handler passes control back to a calling procedure, that pro
 
 Error-handling routines rely on the value in the **Number** property of the **Err** object to determine the cause of the error. The error-handling routine should test or save relevant property values in the **Err** object before any other error can occur or before a procedure that might cause an error is called. The property values in the **Err** object reflect only the most recent error. The error message associated with **Err.Number** is contained in **Err.Description**.
 
-> [!NOTE]
-> Some run-time errors have a different number in twinBASIC than in VBA. An array index outside the array's bounds raises -2147352565, not 9, *Subscript out of range*, so a handler ported from VBA that tests `Err.Number = 9` does not recognise it. [Error numbers that differ from VBA](../Modules/ErrObject/Number#error-numbers-that-differ-from-vba) lists them.
-
 **On Error Resume Next** causes execution to continue with the statement immediately following the statement that caused the run-time error, or with the statement immediately following the most recent call out of the procedure containing the **On Error Resume Next** statement. This statement allows execution to continue despite a run-time error. The error-handling routine can be placed where the error would occur, rather than transferring control to another location within the procedure. An **On Error Resume Next** statement becomes inactive when another procedure is called, so an **On Error Resume Next** statement must be executed in each called routine that requires inline error handling.
 
 > [!NOTE]
diff --git a/docs/Reference/Default/VB/Form/index.md b/docs/Reference/Default/VB/Form/index.md
index 0117421d6..968b50129 100644
--- a/docs/Reference/Default/VB/Form/index.md
+++ b/docs/Reference/Default/VB/Form/index.md
@@ -531,14 +531,11 @@ The compiler turns this syntax into a call with a flags argument; see [Line, Cir
 : *optional* An **OLE_COLOR** for the outline; defaults to [**ForeColor**](#forecolor). See [colour values](../../../Core/Graphics-Methods#colour-values) for how the value is read.
 
 *Start*, *End*
-: *optional* Angles in radians, from -2 pi to 2 pi, counter-clockwise from the 3 o'clock position. With either one given, an arc is drawn rather than a full circle. A negative angle is used as its absolute value, and the radius from the centre to that end of the arc is drawn as well. With both negative the shape is a pie, filled with [**FillColor**](#fillcolor) and [**FillStyle**](#fillstyle); an arc with one radius or none is not filled. A negative zero draws no radius, so a pie that starts at angle 0 is written with a *Start* of `-2 * pi`. A negative angle below -2 pi raises error 5.
+: *optional* Angles in radians, from -2 pi to 2 pi, counter-clockwise from the 3 o'clock position. With either one given, an arc is drawn rather than a full circle. A negative angle is used as its absolute value, and the radius from the centre to that end of the arc is drawn as well. With both negative the shape is a pie, filled with [**FillColor**](#fillcolor) and [**FillStyle**](#fillstyle); an arc with one radius or none is not filled. A negative zero draws no radius, so a pie that starts at angle 0 is written with a *Start* of `-2 * pi`. An angle, positive or negative, whose magnitude exceeds 2 pi raises error 5 and draws nothing.
 
 *Aspect*
 : *optional* Ratio of vertical to horizontal radius. `1.0` is circular; values away from `1.0` produce ellipses.
 
-> [!WARNING]
-> BETA 995 does not check a positive *Start* or *End*: an angle above 2 pi raises no error and draws as if 2 pi had been subtracted, where VB6 raises error 5. See [Line, Circle, PSet, Scale](../../../Core/Graphics-Methods#what-the-built-in-surfaces-do-with-the-flags).
-
 This example draws a filled pie slice on **Form1** and reads a pixel inside it. **Point** is not implemented in twinBASIC (see [**Point**](#point)), so the example reads the pixel with the Windows **GetPixel** function, declared in a module of its own.
 
 ```tb check_build projname=form-circle-pixel project=form slot=file
diff --git a/docs/Reference/Default/VB/Global/index.md b/docs/Reference/Default/VB/Global/index.md
index 3a99acec6..cdf4bfb36 100644
--- a/docs/Reference/Default/VB/Global/index.md
+++ b/docs/Reference/Default/VB/Global/index.md
@@ -40,12 +40,9 @@ These properties are cached references --- repeated reads return the same object
 [**Forms**](#forms) returns the application's collection of currently-loaded [**Form**](../Form/) instances --- every form that has been **Load**-ed or **Show**-n but not yet **Unload**-ed. The collection is live: it grows when a form is loaded and shrinks when one is unloaded. The collection supports three operations:
 
 - **Forms.Count** --- a **Long** giving the number of currently-loaded forms.
-- **Forms.Item(** *Index* **)** --- the [**Form**](../Form/) at zero-based *Index*, a **Long**. **Item** is the default member, so `Forms(0)` and `Forms.Item(0)` are equivalent. An index below 0, or equal to or greater than **Count**, raises run-time error -2147467259 (`&H80004005`), not error 9 (*Subscript out of range*) --- see [Error numbers that differ from VBA](../../../Modules/ErrObject/Number#error-numbers-that-differ-from-vba). A form's name is not an index: `Forms("Form2")` raises error 13 (*Type mismatch*).
+- **Forms.Item(** *Index* **)** --- the [**Form**](../Form/) at zero-based *Index*, a **Long**. **Item** is the default member, so `Forms(0)` and `Forms.Item(0)` are equivalent. An index below 0, or equal to or greater than **Count**, raises run-time error -2147467259 (`&H80004005`), not error 9 (*Subscript out of range*). A form's name is not an index: `Forms("Form2")` raises error 13 (*Type mismatch*).
 - **Forms.Add(** *Name* **)** --- creates a new instance of the form class named *Name*, adds it to the collection, and returns the new [**Form**](../Form/). The form is loaded but not shown.
 
-> [!WARNING]
-> In BETA 995, a form taken out of **Forms** by index is not reliably the form. `Forms(i)` can return a reference to another object, at an address just past the form's own, whose **Name** is an empty string, and the program can then stop with an access violation (`0xC0000005`). Which code does this depends on the expression around it, not on the index: `Set f = Forms(0)` with `f` declared `As Form`, followed by `f.Name` in a string expression, gives an empty **Name** in the IDE and as a compiled program alike, while `Forms(0).Name` is empty only in the IDE. `For Each` over **Forms** works, and so does `Set f = Forms(k)` when `f` is declared `As Object` or as the form's own class: reach a loaded form that way, with `For Each`, or by its class name.
-
 The collection also supports `For Each` enumeration:
 
 ```tb check_build
diff --git a/docs/Reference/Default/VB/PictureBox/index.md b/docs/Reference/Default/VB/PictureBox/index.md
index 25c090b7a..98efe767b 100644
--- a/docs/Reference/Default/VB/PictureBox/index.md
+++ b/docs/Reference/Default/VB/PictureBox/index.md
@@ -474,14 +474,11 @@ The compiler turns this syntax into a call with a flags argument; see [Line, Cir
 : *optional* An **OLE_COLOR** for the outline. Defaults to [**ForeColor**](#forecolor). See [colour values](../../../Core/Graphics-Methods#colour-values) for how the value is read.
 
 *Start*, *End*
-: *optional* Angles in radians, from -2 pi to 2 pi, counter-clockwise from the 3 o'clock position. With either one given, an arc is drawn rather than a full circle. A negative angle is used as its absolute value, and the radius from the centre to that end of the arc is drawn as well. With both negative the shape is a pie, filled with [**FillColor**](#fillcolor) and [**FillStyle**](#fillstyle); an arc with one radius or none is not filled. A negative zero draws no radius, so a pie that starts at angle 0 is written with a *Start* of `-2 * pi`. A negative angle below -2 pi raises error 5.
+: *optional* Angles in radians, from -2 pi to 2 pi, counter-clockwise from the 3 o'clock position. With either one given, an arc is drawn rather than a full circle. A negative angle is used as its absolute value, and the radius from the centre to that end of the arc is drawn as well. With both negative the shape is a pie, filled with [**FillColor**](#fillcolor) and [**FillStyle**](#fillstyle); an arc with one radius or none is not filled. A negative zero draws no radius, so a pie that starts at angle 0 is written with a *Start* of `-2 * pi`. An angle, positive or negative, whose magnitude exceeds 2 pi raises error 5 and draws nothing.
 
 *Aspect*
 : *optional* The Y/X aspect ratio. **1.0** for a circle (default); other values give an ellipse.
 
-> [!WARNING]
-> BETA 995 does not check a positive *Start* or *End*: an angle above 2 pi raises no error and draws as if 2 pi had been subtracted, where VB6 raises error 5. See [Line, Circle, PSet, Scale](../../../Core/Graphics-Methods#what-the-built-in-surfaces-do-with-the-flags).
-
 [**CurrentX**](#currentx) and [**CurrentY**](#currenty) are left at the centre.
 
 ### Cls
diff --git a/docs/Reference/Default/VB/Printer/index.md b/docs/Reference/Default/VB/Printer/index.md
index 48a5a7c2d..12bd24fdf 100644
--- a/docs/Reference/Default/VB/Printer/index.md
+++ b/docs/Reference/Default/VB/Printer/index.md
@@ -366,14 +366,11 @@ The compiler turns this syntax into a call with a flags argument; see [Line, Cir
 : *optional* An **OLE_COLOR** for the outline. Defaults to [**ForeColor**](#forecolor). See [colour values](../../../Core/Graphics-Methods#colour-values) for how the value is read.
 
 *Start*, *End*
-: *optional* Angles in radians, from -2 pi to 2 pi, counter-clockwise from the 3 o'clock position. With either one given, an arc is drawn rather than a full circle. A negative angle is used as its absolute value, and the radius from the centre to that end of the arc is drawn as well. With both negative the shape is a pie, filled with [**FillColor**](#fillcolor) and [**FillStyle**](#fillstyle); an arc with one radius or none is not filled. A negative zero draws no radius, so a pie that starts at angle 0 is written with a *Start* of `-2 * pi`. A negative angle below -2 pi raises error 5.
+: *optional* Angles in radians, from -2 pi to 2 pi, counter-clockwise from the 3 o'clock position. With either one given, an arc is drawn rather than a full circle. A negative angle is used as its absolute value, and the radius from the centre to that end of the arc is drawn as well. With both negative the shape is a pie, filled with [**FillColor**](#fillcolor) and [**FillStyle**](#fillstyle); an arc with one radius or none is not filled. A negative zero draws no radius, so a pie that starts at angle 0 is written with a *Start* of `-2 * pi`. An angle, positive or negative, whose magnitude exceeds 2 pi raises error 5 and draws nothing.
 
 *Aspect*
 : *optional* The Y/X aspect ratio. **1.0** for a circle (default); other values give an ellipse.
 
-> [!WARNING]
-> BETA 995 does not check a positive *Start* or *End*: an angle above 2 pi raises no error and draws as if 2 pi had been subtracted, where VB6 raises error 5. See [Line, Circle, PSet, Scale](../../../Core/Graphics-Methods#what-the-built-in-surfaces-do-with-the-flags).
-
 If no job is in progress, **Circle** implicitly starts one.
 
 ### EndDoc
diff --git a/docs/Reference/Default/VB/Printers/index.md b/docs/Reference/Default/VB/Printers/index.md
index aa8f4f056..6993e7464 100644
--- a/docs/Reference/Default/VB/Printers/index.md
+++ b/docs/Reference/Default/VB/Printers/index.md
@@ -42,9 +42,9 @@ Next
 
 ## Indexing
 
-Numeric indexing is **0-based**, in contrast with most VB6 collections, which are 1-based. The first installed printer is `Printers(0)`; the last is `Printers(Printers.Count - 1)`. An index past the end raises run-time error 9 (*Subscript out of range*); a negative index raises -2147467259 (`&H80004005`) instead.
+Numeric indexing is **0-based**, in contrast with most VB6 collections, which are 1-based. The first installed printer is `Printers(0)`; the last is `Printers(Printers.Count - 1)`. An index past the end, or a negative one, raises run-time error 9 (*Subscript out of range*).
 
-String indexing looks up by **DeviceName** --- new in twinBASIC; VB6's **Printers** supports only numeric access. A name that is not present raises -2147467259 (`&H80004005`), the error a [**Collection**](../../../Modules/Collection/Item) raises for a missing key --- not VBA's 5 (*Invalid procedure call or argument*).
+String indexing looks up by **DeviceName** --- new in twinBASIC; VB6's **Printers** supports only numeric access. A name that is not present raises run-time error 5 (*Invalid procedure call or argument*), as a [**Collection**](../../../Modules/Collection/Item) does for a missing key.
 
 ## Properties
 
@@ -63,7 +63,7 @@ Returns the [**Printer**](../Printer/) at the given index. **Default property**
 Syntax: *object*.**Item**( *Index* ) **As Printer**
 
 *Index*
-: *required* A **Variant**. As a **Long**, the zero-based position in the collection (`0` to `Count - 1`); a value past the end raises run-time error 9, and a negative one -2147467259. As a **String**, the **DeviceName** of the printer; an unknown name raises -2147467259.
+: *required* A **Variant**. As a **Long**, the zero-based position in the collection (`0` to `Count - 1`); a value past the end, or a negative one, raises run-time error 9. As a **String**, the **DeviceName** of the printer; an unknown name raises run-time error 5.
 
 ## See Also
 
diff --git a/docs/Reference/Default/VB/PropertyPage/index.md b/docs/Reference/Default/VB/PropertyPage/index.md
index 71d22040d..90145ab8a 100644
--- a/docs/Reference/Default/VB/PropertyPage/index.md
+++ b/docs/Reference/Default/VB/PropertyPage/index.md
@@ -411,14 +411,11 @@ The compiler turns this syntax into a call with a flags argument; see [Line, Cir
 : *optional* An **OLE_COLOR** for the outline; defaults to [**ForeColor**](#forecolor). See [colour values](../../../Core/Graphics-Methods#colour-values) for how the value is read.
 
 *Start*, *End*
-: *optional* Angles in radians, from -2 pi to 2 pi, counter-clockwise from the 3 o'clock position. With either one given, an arc is drawn rather than a full circle. A negative angle is used as its absolute value, and the radius from the centre to that end of the arc is drawn as well. With both negative the shape is a pie, filled with [**FillColor**](#fillcolor) and [**FillStyle**](#fillstyle); an arc with one radius or none is not filled. A negative zero draws no radius, so a pie that starts at angle 0 is written with a *Start* of `-2 * pi`. A negative angle below -2 pi raises error 5.
+: *optional* Angles in radians, from -2 pi to 2 pi, counter-clockwise from the 3 o'clock position. With either one given, an arc is drawn rather than a full circle. A negative angle is used as its absolute value, and the radius from the centre to that end of the arc is drawn as well. With both negative the shape is a pie, filled with [**FillColor**](#fillcolor) and [**FillStyle**](#fillstyle); an arc with one radius or none is not filled. A negative zero draws no radius, so a pie that starts at angle 0 is written with a *Start* of `-2 * pi`. An angle, positive or negative, whose magnitude exceeds 2 pi raises error 5 and draws nothing.
 
 *Aspect*
 : *optional* Ratio of vertical to horizontal radius. `1.0` is circular; values away from `1.0` produce ellipses.
 
-> [!WARNING]
-> BETA 995 does not check a positive *Start* or *End*: an angle above 2 pi raises no error and draws as if 2 pi had been subtracted, where VB6 raises error 5. See [Line, Circle, PSet, Scale](../../../Core/Graphics-Methods#what-the-built-in-surfaces-do-with-the-flags).
-
 ### Cls
 {: .no_toc }
 
diff --git a/docs/Reference/Default/VB/Report/index.md b/docs/Reference/Default/VB/Report/index.md
index 801fec174..421d6c2ca 100644
--- a/docs/Reference/Default/VB/Report/index.md
+++ b/docs/Reference/Default/VB/Report/index.md
@@ -573,14 +573,11 @@ The compiler turns this syntax into a call with a flags argument; see [Line, Cir
 : *optional* An **OLE_COLOR** for the outline; defaults to [**ForeColor**](#forecolor). See [colour values](../../../Core/Graphics-Methods#colour-values) for how the value is read.
 
 *Start*, *End*
-: *optional* Angles in radians, from -2 pi to 2 pi, counter-clockwise from the 3 o'clock position. With either one given, an arc is drawn rather than a full circle. A negative angle is used as its absolute value, and the radius from the centre to that end of the arc is drawn as well. With both negative the shape is a pie, filled with [**FillColor**](#fillcolor) and [**FillStyle**](#fillstyle); an arc with one radius or none is not filled. A negative zero draws no radius, so a pie that starts at angle 0 is written with a *Start* of `-2 * pi`. A negative angle below -2 pi raises error 5.
+: *optional* Angles in radians, from -2 pi to 2 pi, counter-clockwise from the 3 o'clock position. With either one given, an arc is drawn rather than a full circle. A negative angle is used as its absolute value, and the radius from the centre to that end of the arc is drawn as well. With both negative the shape is a pie, filled with [**FillColor**](#fillcolor) and [**FillStyle**](#fillstyle); an arc with one radius or none is not filled. A negative zero draws no radius, so a pie that starts at angle 0 is written with a *Start* of `-2 * pi`. An angle, positive or negative, whose magnitude exceeds 2 pi raises error 5 and draws nothing.
 
 *Aspect*
 : *optional* Ratio of vertical to horizontal radius. `1.0` is circular; values away from `1.0` produce ellipses.
 
-> [!WARNING]
-> BETA 995 does not check a positive *Start* or *End*: an angle above 2 pi raises no error and draws as if 2 pi had been subtracted, where VB6 raises error 5. See [Line, Circle, PSet, Scale](../../../Core/Graphics-Methods#what-the-built-in-surfaces-do-with-the-flags).
-
 ### Close
 {: .no_toc }
 
diff --git a/docs/Reference/Default/VB/UserControl/index.md b/docs/Reference/Default/VB/UserControl/index.md
index 396255987..7c0260058 100644
--- a/docs/Reference/Default/VB/UserControl/index.md
+++ b/docs/Reference/Default/VB/UserControl/index.md
@@ -618,14 +618,11 @@ The compiler turns this syntax into a call with a flags argument; see [Line, Cir
 : *optional* An **OLE_COLOR** for the outline; defaults to [**ForeColor**](#forecolor). See [colour values](../../../Core/Graphics-Methods#colour-values) for how the value is read.
 
 *Start*, *End*
-: *optional* Angles in radians, from -2 pi to 2 pi, counter-clockwise from the 3 o'clock position. With either one given, an arc is drawn rather than a full circle. A negative angle is used as its absolute value, and the radius from the centre to that end of the arc is drawn as well. With both negative the shape is a pie, filled with [**FillColor**](#fillcolor) and [**FillStyle**](#fillstyle); an arc with one radius or none is not filled. A negative zero draws no radius, so a pie that starts at angle 0 is written with a *Start* of `-2 * pi`. A negative angle below -2 pi raises error 5.
+: *optional* Angles in radians, from -2 pi to 2 pi, counter-clockwise from the 3 o'clock position. With either one given, an arc is drawn rather than a full circle. A negative angle is used as its absolute value, and the radius from the centre to that end of the arc is drawn as well. With both negative the shape is a pie, filled with [**FillColor**](#fillcolor) and [**FillStyle**](#fillstyle); an arc with one radius or none is not filled. A negative zero draws no radius, so a pie that starts at angle 0 is written with a *Start* of `-2 * pi`. An angle, positive or negative, whose magnitude exceeds 2 pi raises error 5 and draws nothing.
 
 *Aspect*
 : *optional* Ratio of vertical to horizontal radius. `1.0` is circular; values away from `1.0` produce ellipses.
 
-> [!WARNING]
-> BETA 995 does not check a positive *Start* or *End*: an angle above 2 pi raises no error and draws as if 2 pi had been subtracted, where VB6 raises error 5. See [Line, Circle, PSet, Scale](../../../Core/Graphics-Methods#what-the-built-in-surfaces-do-with-the-flags).
-
 ### Cls
 {: .no_toc }
 
diff --git a/docs/Reference/Default/VBA/Collection/Item.md b/docs/Reference/Default/VBA/Collection/Item.md
index 3b3f45767..777373973 100644
--- a/docs/Reference/Default/VBA/Collection/Item.md
+++ b/docs/Reference/Default/VBA/Collection/Item.md
@@ -17,10 +17,9 @@ Syntax: *object*.**Item(** *index* **)**
 *index*
 : *required* An expression that specifies the position of a member of the collection. If a numeric expression, *index* must be a number from 1 to the value of the collection's [**Count**](Count) property. If a string expression, *index* must correspond to the *key* argument specified when the member referred to was added to the collection.
 
-If *index* doesn't match any existing member of the collection, run-time error -2147467259 (`&H80004005`, *Unspecified error*) occurs. If *index* is neither a number nor a string, an error also occurs.
+If *index* is a number that does not match the position of any member of the collection, run-time error 9 (*Subscript out of range*) occurs. If *index* is a string that does not match the key of any member, run-time error 5 (*Invalid procedure call or argument*) occurs. If *index* is neither a number nor a string, an error also occurs.
 
-> [!NOTE]
-> VBA raises error 9, *Subscript out of range*, for a member that does not exist, so VBA code that tests `Err.Number = 9` does not recognise the twinBASIC error --- see [Error numbers that differ from VBA](../ErrObject/Number#error-numbers-that-differ-from-vba). To test for a key without raising an error, use [**Exists**](Exists).
+To test for a key without raising an error, use [**Exists**](Exists).
 
 **Item** is the default member of a **Collection** object. Therefore, the following lines of code are equivalent:
 
diff --git a/docs/Reference/Default/VBA/ErrObject/Number.md b/docs/Reference/Default/VBA/ErrObject/Number.md
index be85ec17a..e5087426b 100644
--- a/docs/Reference/Default/VBA/ErrObject/Number.md
+++ b/docs/Reference/Default/VBA/ErrObject/Number.md
@@ -22,22 +22,6 @@ When returning a user-defined error from an object, set **Err.Number** by adding
 Err.Raise Number:=vbObjectError + 1051, Source:="SomeClass"
 ```
 
-## Error 9, Subscript out of range: numbers that differ from VBA
-{: #error-numbers-that-differ-from-vba }
-
-> [!NOTE]
-> As of BETA 995, twinBASIC does not raise error 9, *Subscript out of range*, for an array index that is out of range or for a **Collection** member that does not exist. VBA's documentation gives error 9 for each case below; twinBASIC raises a different number.
-
-| Access | VBA | twinBASIC |
-|---|---|---|
-| An array index outside the array's bounds, in any dimension --- in a fixed or dynamic array, an array held in a **Variant**, or the array that [**Split**](../Strings/Split) returns | 9 | -2147352565 (`&H8002000B`) *Invalid index.* |
-| Any element of a dynamic array that has no dimensions, because it was never dimensioned or was emptied with [**Erase**](../../Core/Erase) | 9 | -2147467259 (`&H80004005`) *Unspecified error* |
-| A [**Collection**](../Collection/) member that does not exist, by position or by key | 9 | -2147467259 (`&H80004005`) *Unspecified error* |
-
-Code ported from VBA that relies on `Err.Number = 9` to detect a bad index misses these errors. Check the index before using it instead: compare it with [**LBound**](../Information/LBound) and [**UBound**](../Information/UBound) for an array, compare it with [**Count**](../Collection/Count) for a **Collection**, or test a key with [**Exists**](../Collection/Exists). Where the error itself has to be handled, test for the twinBASIC number as well as `9`. The hexadecimal literals `&H8002000B` and `&H80004005` are equal to the two numbers.
-
-Error 9 is still raised elsewhere. **LBound** and **UBound** raise it for an array that has no dimensions, and the VB package's [**Printers**](../../Packages/VB/Printers/) collection raises it for an index past its end. The VB package's [**Forms**](../../Packages/VB/Global/#forms-collection) collection raises -2147467259 instead.
-
 ## Example
 
 The first example illustrates a typical use of the **Number** property in an error-handling routine.
diff --git a/docs/Reference/Default/VBA/FileSystem/FileCopy.md b/docs/Reference/Default/VBA/FileSystem/FileCopy.md
index 4de4bd128..959cd12c8 100644
--- a/docs/Reference/Default/VBA/FileSystem/FileCopy.md
+++ b/docs/Reference/Default/VBA/FileSystem/FileCopy.md
@@ -19,10 +19,7 @@ Syntax: **FileCopy** *source*, *destination*
 *destination*
 : *required* String expression that specifies the target file name. The *destination* may include directory or folder, and drive.
 
-An error occurs when **FileCopy** is used on a file that is currently open.
-
-> [!NOTE]
-> twinBASIC raises run-time error -2147467259 (`&H80004005`, *Unspecified error*) for a file that is open, for **Input** as well as for **Append**. VB6 raises error 55 (*File already open*) for a file open for **Append**, and copies a file open for **Input** without an error.
+**FileCopy** raises run-time error 55 (*File already open*) when *source* is a file that is currently open for **Append**. A file that is open for **Input** is copied without an error, and so is a file that is closed.
 
 ### Example
 
diff --git a/docs/Reference/Default/VBA/FileSystem/index.md b/docs/Reference/Default/VBA/FileSystem/index.md
index 96240f500..625e028d4 100644
--- a/docs/Reference/Default/VBA/FileSystem/index.md
+++ b/docs/Reference/Default/VBA/FileSystem/index.md
@@ -35,7 +35,7 @@ Loop
 
 ## Copying and deleting
 
-[**FileCopy**](FileCopy) copies one file to another, and [**Kill**](Kill) deletes files matching a wildcard pattern. Both operate by pathname and raise a run-time error when asked to act on a file the current process has open.
+[**FileCopy**](FileCopy) copies one file to another, and [**Kill**](Kill) deletes files matching a wildcard pattern. Both operate by pathname. **Kill** raises a run-time error when asked to delete a file that is open, and **FileCopy** raises one for a file that is open for **Append**.
 
 ```tb check_build
 FileCopy "C:\Data\report.xlsx", "C:\Backup\report.xlsx"
diff --git a/docs/Reference/Default/VBA/Strings/StrConv.md b/docs/Reference/Default/VBA/Strings/StrConv.md
index d5d6e860e..7bfc724b8 100644
--- a/docs/Reference/Default/VBA/Strings/StrConv.md
+++ b/docs/Reference/Default/VBA/Strings/StrConv.md
@@ -39,10 +39,7 @@ The *conversion* argument settings are:
 > [!NOTE]
 > These constants are specified by twinBASIC. As a result, they may be used anywhere in code in place of the actual values. Most can be combined, for example, **vbUpperCase + vbWide**, except when they are mutually exclusive, for example, **vbUnicode + vbFromUnicode**. The constants **vbWide**, **vbNarrow**, **vbKatakana**, and **vbHiragana** cause run-time errors when used in locales where they don't apply.
 
-The following are valid word separators for proper casing: **Null** (`Chr$(0)`), horizontal tab (`Chr$(9)`), linefeed (`Chr$(10)`), vertical tab (`Chr$(11)`), form feed (`Chr$(12)`), carriage return (`Chr$(13)`), space (SBCS) (`Chr$(32)`). The actual value for a space varies by country/region for DBCS. No other character, such as a hyphen or an apostrophe, starts a word: `"mc-donald"` becomes `"Mc-donald"`.
-
-> [!WARNING]
-> BETA 995 has a defect in **vbProperCase**: it leaves a word in lowercase when the word follows an even number of consecutive separators, such as two spaces or the carriage return and linefeed of **vbCrLf**. `StrConv("a  b", vbProperCase)` returns `"A  b"`, where it should return `"A  B"`. A word after one separator, or after three, is capitalised. BETA 983 capitalised every word, as Visual Basic 6 does.
+The following are valid word separators for proper casing: **Null** (`Chr$(0)`), horizontal tab (`Chr$(9)`), linefeed (`Chr$(10)`), vertical tab (`Chr$(11)`), form feed (`Chr$(12)`), carriage return (`Chr$(13)`), space (SBCS) (`Chr$(32)`). The actual value for a space varies by country/region for DBCS. No other character, such as a hyphen or an apostrophe, starts a word: `"mc-donald"` becomes `"Mc-donald"`. Every word is capitalised, whatever the number of separators before it: `"a  b"` (two spaces) becomes `"A  B"`, and `"a" & vbCrLf & "b"` becomes `"A" & vbCrLf & "B"`.
 
 If *string* is **Null**, **StrConv** returns **Null**.
 
diff --git a/docs/Reference/Default/VBRUN/ErrorContext/index.md b/docs/Reference/Default/VBRUN/ErrorContext/index.md
index b3fc48790..c598e9417 100644
--- a/docs/Reference/Default/VBRUN/ErrorContext/index.md
+++ b/docs/Reference/Default/VBRUN/ErrorContext/index.md
@@ -85,9 +85,6 @@ Syntax: *object*.**Number**
 
 Many built-in errors use VBA's error numbers --- for example, `11` for *Division by zero*, `13` for *Type mismatch* and `91` for *Object variable or With block variable not set*. User-defined errors raised with **Err.Raise** typically add the **vbObjectError** offset to a small per-application code.
 
-> [!NOTE]
-> An array index or a **Collection** lookup that is out of range does not raise VBA's error `9`, *Subscript out of range*. An array index outside the array's bounds raises -2147352565 (`&H8002000B`), and a **Collection** member that does not exist raises -2147467259 (`&H80004005`). See [Error numbers that differ from VBA](../../../Modules/ErrObject/Number#error-numbers-that-differ-from-vba).
-
 ### Source
 
 Returns the name of the object or application that raised the error, as a **String**. Read-only.
diff --git a/test/addin/keys.test.mjs b/test/addin/keys.test.mjs
index 87a2aff49..33f7f7d43 100644
--- a/test/addin/keys.test.mjs
+++ b/test/addin/keys.test.mjs
@@ -5,8 +5,9 @@
 //
 // Each test states what BETA 983 and 995 do. If one fails after an IDE update, the
 // IDE has changed: update P1 and P2 in WIP.HelpAddin.md, the NOTE on
-// docs/Reference/Built-In/tbIDE/KeyboardShortcuts.md and the filed reports in
-// bugs/filed/ (twinbasic/twinbasic#2445, #2446), and then this file.
+// docs/Reference/Built-In/tbIDE/KeyboardShortcuts.md and the filed report in
+// bugs/filed/ (twinbasic/twinbasic#2445), and then this file. P2's last test
+// states what BETA 997 does: earlier builds report the toggle failing.
 //
 // Run it with addin-test.bat, which gives it a lane; on its own it is skipped.
 
@@ -146,7 +147,7 @@ scenario("P1 and P2: add-in keyboard shortcuts", (lane) => {
     await c.evaluate(`editor.getModel().setValue(${JSON.stringify(text)})`);
   });
 
-  test("P2: F1 while signature help shows toggles it, the IDE reports a failure, and the add-in fires", async () => {
+  test("P2: F1 while signature help shows toggles it, and the add-in fires", async () => {
     // Inside FindTheNeedle's parentheses. Typing the call instead would work
     // as well, since setCursor waits out the time in which the IDE can put the
     // cursor back where openFile put it (afterReveal in tb-operate.mjs).
@@ -164,10 +165,9 @@ scenario("P1 and P2: add-in keyboard shortcuts", (lane) => {
     const lines = (await linesSince(c, mark)).filter(Boolean);
     assert.deepEqual(fired, ["f1"]);
     assert.equal(await c.evaluate("sigHelpIsExpanded"), !expanded, "F1 did not toggle signature help");
-    // toggleSigHelp() dereferences the event it is not given (twinbasic/twinbasic#2446).
     assert.ok(
-      lines.includes('command failed: "tbHelp_ToggleExpandSignatureHelp"'),
-      `the IDE no longer reports the toggle failing: ${JSON.stringify(lines)}`,
+      !lines.some((l) => l.startsWith("command failed:")),
+      `the IDE reports a command failing: ${JSON.stringify(lines)}`,
     );
     await pressKey(c, "Escape");
   });
diff --git a/test/addin/symbols.test.mjs b/test/addin/symbols.test.mjs
index 84e2485a5..575ab05f5 100644
--- a/test/addin/symbols.test.mjs
+++ b/test/addin/symbols.test.mjs
@@ -192,10 +192,11 @@ scenario("P5: what the compiler says about the name under the cursor", (lane) =>
     assert.match(await hover(c, "ByVal n As Long", "Long"), /^\*\*Long\*\*/);
   });
 
-  test("hover says a ByVal parameter of String, Variant, Object or a class was made because Option Explicit is off, which it is not", async () => {
-    // twinbasic/twinbasic#2448. The project has project.optionExplicit true.
-    const NOTE = "***note:*** *this variable was auto-generated due to* ***Option Explicit*** *being Off*";
-    const noted = {
+  test("hover on a declared parameter or variable says nothing about Option Explicit", async () => {
+    // The project has project.optionExplicit true. BETA 995 and earlier said a
+    // ByVal parameter of String, Variant, Object or a class was auto-generated
+    // because Option Explicit is off (twinbasic/twinbasic#2448, fixed in 997).
+    const byVal = {
       "Debug.Print h Is": "h",
       "count, col Is": "col",
       "Nothing, o Is": "o",
@@ -203,10 +204,10 @@ scenario("P5: what the compiler says about the name under the cursor", (lane) =>
       "Nothing, s,": "s",
       "Host.ToolWindows": "Host",
     };
-    for (const [text, word] of Object.entries(noted)) {
+    for (const [text, word] of Object.entries(byVal)) {
       const h = await hover(c, text, word);
       assert.match(h, /^\*parameter\* ByVal /, `${word}: ${JSON.stringify(h)}`);
-      assert.ok(h.includes(NOTE), `${word} no longer has the note: ${JSON.stringify(h)}`);
+      assert.ok(!h.includes("Option Explicit"), `${word}: ${JSON.stringify(h)}`);
     }
     const plain = {
       "Nothing, count": "count",
@@ -322,9 +323,9 @@ scenario("P5: what the compiler says about the name under the cursor", (lane) =>
     assert.equal(whereIn(h), null, JSON.stringify(h));
   });
 
-  // The defect filed as twinbasic/twinbasic#2465 (bugs/filed/enum-member-description-hover/).
-  // When it is fixed this fails: make this test say what is right, and delete the folder.
-  test("a [Description] on an enumeration's member is listed as a member of the enumeration, and not shown on the member", async () => {
+  // Not a defect (twinbasic/twinbasic#2465): inside an Enum, a [Description(...)]
+  // line is a member named by a bracketed identifier, as VB6 allows, not an attribute.
+  test("a [Description(...)] line in an enumeration is a member of its own, and the next member has no description", async () => {
     const shade = await hoverDescribed(c, "Debug.Print Shade.Light", "Shade");
     assert.match(shade, /\n - Description\("The light one\."\)/, JSON.stringify(shade));
     const light = await hoverDescribed(c, "Shade.Light, p.X", "Light");
diff --git a/test/ide/debugger.test.mjs b/test/ide/debugger.test.mjs
index 107819c39..f3e3e20f5 100644
--- a/test/ide/debugger.test.mjs
+++ b/test/ide/debugger.test.mjs
@@ -67,6 +67,18 @@ scenario("the debugger at a run-time error", (lane) => {
     c = await lane.open(PROJECT);
   });
 
+  // docs/IDE/Menu/Debug.md quotes this panel.
+  test("the panel names the error: its number, in hexadecimal as well, and its description", async () => {
+    await runToError();
+    const text = await c.evaluate(`document.querySelector(".errorWidget").innerText`);
+    await stopIfRunning();
+    assert.match(
+      text,
+      /^Run-time error 9 \(00000009\)\n\s*DESCRIPTION:\nSubscript out of range\n/,
+      JSON.stringify(text),
+    );
+  });
+
   test("F8 on the failing line runs it again: the error recurs and the mark stays", async () => {
     await runToError();
     await pressKey(c, "F8");
diff --git a/test/ide/export.test.mjs b/test/ide/export.test.mjs
index 5d8c0ae6f..53c8a3a03 100644
--- a/test/ide/export.test.mjs
+++ b/test/ide/export.test.mjs
@@ -73,7 +73,8 @@ scenario("Export Project", (lane) => {
     assert.ok(packages.includes("VBA"), `no Packages\\VBA among ${packages.join(", ")}`);
   });
 
-  test("a junction in the export folder is followed, and its target emptied", async () => {
+  test("a junction in the export folder is not followed, and its target is kept", async () => {
+    // BETA 995 and earlier emptied the target (twinbasic/twinbasic#2456, fixed in 997).
     const out = path.join(root, "junction");
     const outside = path.join(root, "outside");
     mkdirSync(out);
@@ -82,10 +83,10 @@ scenario("Export Project", (lane) => {
     symlinkSync(outside, path.join(out, "linked"), "junction");
     const lines = await exportTo(out);
     assert.ok(
-      lines.some((l) => /^DELETED: .*\\linked\\precious\.txt$/.test(l)),
-      "the export no longer deletes through the junction",
+      !lines.some((l) => /\\linked\\precious\.txt$/.test(l)),
+      `the export reaches through the junction: ${JSON.stringify(lines)}`,
     );
-    assert.deepEqual(filesUnder(outside), []);
+    assert.deepEqual(filesUnder(outside), ["precious.txt"]);
   });
 
   test("a read-only file stops the export part-way, and the IDE reports nothing", async () => {
diff --git a/test/png.test.mjs b/test/png.test.mjs
index aa2ed13d3..bb3e65d3d 100644
--- a/test/png.test.mjs
+++ b/test/png.test.mjs
@@ -860,8 +860,10 @@ describe("the bug reports show their pictures", () => {
     .map((r) => ({ ...r, images: JSON.parse(readFileSync(path.join(r.dir, "repro.json"), "utf8")).images }))
     .filter((r) => Array.isArray(r.images));
 
-  test("at least one reproducer has pictures, so this check reads something", () => {
-    assert.ok(withImages.length > 0);
+  // A queue can hold no graphical entry; the tests above cover embedProblems itself.
+  test("the scan finds reproducers, so this check reads something", (t) => {
+    assert.ok(all.length > 0);
+    if (withImages.length === 0) t.diagnostic("no reproducer names pictures today");
   });
 
   for (const r of withImages) {

From b49467013f45132354db8482d0f051c19efe34f4 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 17:56:23 +0200
Subject: [PATCH 08/42] Pages state what twinBASIC does now: history of earlier
 builds removed (LSet, RightShift, TextBox Change, Graphics-Methods colours,
 IEnumVARIANT, Windowless, Debugging, Module-Organization,
 Inline-Initialization, API-Declarations, Fusion)

---
 docs/Features/Advanced/API-Declarations.md      | 2 +-
 docs/Features/Compiler-IDE/Debugging.md         | 4 +---
 docs/Features/Fusion.md                         | 2 +-
 docs/Features/GUI-Components/Windowless.md      | 3 ---
 docs/Features/Language/Inline-Initialization.md | 2 +-
 docs/Features/Language/Module-Organization.md   | 2 +-
 docs/Reference/COM-Interfaces/IEnumVARIANT.md   | 2 +-
 docs/Reference/Core/Graphics-Methods.md         | 4 ++--
 docs/Reference/Core/LSet.md                     | 3 ---
 docs/Reference/Core/RightShift.md               | 3 ---
 docs/Reference/Default/VB/TextBox/index.md      | 2 +-
 11 files changed, 9 insertions(+), 20 deletions(-)

diff --git a/docs/Features/Advanced/API-Declarations.md b/docs/Features/Advanced/API-Declarations.md
index 4be70fc6b..a9191e1af 100644
--- a/docs/Features/Advanced/API-Declarations.md
+++ b/docs/Features/Advanced/API-Declarations.md
@@ -147,7 +147,7 @@ End Function
 
 ## Support for Passing User-Defined Types ByVal
 
-Simple UDTs can now be passed ByVal in APIs, interfaces, and any other method. In VBx this previously required workarounds like passing each argument separately.
+Simple UDTs can be passed ByVal in APIs, interfaces, and any other method. In VB6 this requires workarounds such as passing each member separately.
 
 ```tb hidden
 ' Context for the two samples below: the Windows types they pass. A reader has
diff --git a/docs/Features/Compiler-IDE/Debugging.md b/docs/Features/Compiler-IDE/Debugging.md
index d6f1805b6..6c78c26cd 100644
--- a/docs/Features/Compiler-IDE/Debugging.md
+++ b/docs/Features/Compiler-IDE/Debugging.md
@@ -39,6 +39,4 @@ Bugs result from using Strings and Variants after they have been freed. It may n
 
 Below shows an example where the ListView ColumnHeader text had been set by previously-freed string and detected by this feature:
 
-![A ListView whose column header text has been replaced by rows of warning symbols, marking the use of a freed string](../Images/021f6cbf-acce-445d-ade7-3fcad0af4927.png)
-
-Previously, it had shown the same text for every column-- but only under certain circumstances, leading to the issue being overlooked for a long time.
+![A ListView whose column header text has been replaced by rows of warning symbols, marking the use of a freed string](../Images/021f6cbf-acce-445d-ade7-3fcad0af4927.png)
\ No newline at end of file
diff --git a/docs/Features/Fusion.md b/docs/Features/Fusion.md
index 5f165f584..fa2c0f604 100644
--- a/docs/Features/Fusion.md
+++ b/docs/Features/Fusion.md
@@ -175,7 +175,7 @@ Fusion is a compatibility layer, but not all ActiveX controls are supported.
 
 ## Event Differences
 
-Mouse events are not currently OLE-translated, therefore mouse event signatures (MouseDown, MouseUp, MouseMove) will differ from traditional ActiveX expectations.  This is a current limitation, and will fixed in a later update.
+Mouse events are not OLE-translated, so the mouse event signatures (MouseDown, MouseUp, MouseMove) differ from what an ActiveX container expects.
 
 ## Summary
 
diff --git a/docs/Features/GUI-Components/Windowless.md b/docs/Features/GUI-Components/Windowless.md
index c664529f2..3d9a3fbc1 100644
--- a/docs/Features/GUI-Components/Windowless.md
+++ b/docs/Features/GUI-Components/Windowless.md
@@ -18,7 +18,6 @@ redirect_from:
 | **Z-Order Behavior** | Always rendered beneath windowed controls[^4] | Can float above other controls |
 | **Input Handling** | Requires manual routing of input (keyboard, mouse) via container | OS handles input natively |
 | **Accessibility** | Needs explicit support via interfaces like `IAccessibleWindowlessSite`[^1] | Built-in accessibility support |
-| **Known Issues** | May require custom handling to work around known issues in twinBASIC (e.g., events not firing)[^2] | More complete and stable |
 | **Use Case Fit** | Ideal for lightweight, static UI elements (e.g., labels, images) | Best for interactive or focusable controls (e.g., textboxes, buttons) |
 
 ---
@@ -35,13 +34,11 @@ redirect_from:
 
 - **Complex Input Handling**: You must manually forward focus, mouse, and keyboard events from the container.  
 - **Z-Order Limitations**: Cannot appear above windowed controls---problematic for overlays or tooltips.<sup>4</sup>  
-- **Quirks**: twinBASIC has some known issues with windowless control events and other features.<sup>2</sup> 
 - **Accessibility Overhead**: Requires extra work to expose accessibility interfaces.<sup>1</sup>
 
 ---
 
 [^1]:  [IAccessibleWindowlessSite Interface on Microsoft Learn](https://learn.microsoft.com/en-us/windows/win32/api/oleacc/nn-oleacc-iaccessiblewindowlesssite)
-[^2]: Originally reported in [twinBASIC GitHub Issue #1310 -- Windowless Anchor Resizing Bug](https://github.com/twinbasic/twinbasic/issues/1310). Fixed in BETA 162.
 [^3]: Overview of [GDI object handles](https://learn.microsoft.com/en-us/windows/win32/sysinfo/gdi-objects) and [hWnd user object handles](https://learn.microsoft.com/en-us/windows/win32/sysinfo/user-objects)  in Windows UI architecture: [MSDN -- Window Resources](https://learn.microsoft.com/en-us/windows/win32/winmsg/about-windows)
 [^4]: Background on Z-order rendering and Windows control layering: [Windows Controls - Z-order](https://learn.microsoft.com/en-us/windows/win32/winmsg/window-features#z-order)
 
diff --git a/docs/Features/Language/Inline-Initialization.md b/docs/Features/Language/Inline-Initialization.md
index f1d432209..0dd87b5a2 100644
--- a/docs/Features/Language/Inline-Initialization.md
+++ b/docs/Features/Language/Inline-Initialization.md
@@ -24,7 +24,7 @@ Dim cMC As cMyClass = New cMyClass(customConstructorArgs)
 
 ## Inline Variable Declaration for For
 
-You now no longer need a separate `Dim` statement for counter variables:
+A counter variable needs no separate `Dim` statement:
 
 ```tb check_build
 For i As Long = 0 To 10
diff --git a/docs/Features/Language/Module-Organization.md b/docs/Features/Language/Module-Organization.md
index bd18fafaa..90226e88c 100644
--- a/docs/Features/Language/Module-Organization.md
+++ b/docs/Features/Language/Module-Organization.md
@@ -7,7 +7,7 @@ permalink: /Features/Language/Module-Organization
 
 # Module-Level Code Organization
 
-It's now possible to insert module-level code in between methods or properties. Where previously all `Declare` statements, `Enum`, `Type`, etc had to appear prior to the first `Sub/Function/Property`, the following would now be valid:
+Module-level code can appear in between methods or properties. `Declare` statements, `Enum`, `Type` and similar declarations need not come before the first `Sub/Function/Property`, as VB6 requires. The following is valid:
 
 ```tb check_build
 Private Const foo = "foo"
diff --git a/docs/Reference/COM-Interfaces/IEnumVARIANT.md b/docs/Reference/COM-Interfaces/IEnumVARIANT.md
index e4abed37a..d61836b31 100644
--- a/docs/Reference/COM-Interfaces/IEnumVARIANT.md
+++ b/docs/Reference/COM-Interfaces/IEnumVARIANT.md
@@ -100,7 +100,7 @@ The copy and the original then move independently: a **Next** or **Skip** on one
 
 ## How For Each uses it
 
-**For Each** over an object calls the object's enumerator member once, then uses the enumerator it returns in a fixed way, the same in BETA 983 and BETA 995:
+**For Each** over an object calls the object's enumerator member once, then uses the enumerator it returns in a fixed way:
 
 - It calls **Reset** first. A **Reset** that returns `E_NOTIMPL` is ignored, and the loop goes on.
 - It calls **Next** once per item, always with *celt* = 1 and a null *pCeltFetched*.
diff --git a/docs/Reference/Core/Graphics-Methods.md b/docs/Reference/Core/Graphics-Methods.md
index c4eb9e477..cc846599e 100644
--- a/docs/Reference/Core/Graphics-Methods.md
+++ b/docs/Reference/Core/Graphics-Methods.md
@@ -145,10 +145,10 @@ The built-in surfaces read *Color* as a **Long**. When *Color* is left out they
 - **&H80**: a system colour. A value from `&H80000000` to `&H8000001E` draws the current system colour of that index, as **GetSysColor** returns it, so `vbButtonFace` (`&H8000000F`) draws in the colour of a button face. Any other value with `&H80` as its top byte, such as `&H8000001F` or `&H80010003`, draws black.
 - **Any other top byte**: an RGB colour held in the low 24 bits as `&HBBGGRR`. The top byte is ignored, so `-1` and `&H7FFFFFFF` draw white, `&H1000000` draws black and `&H10000FF` draws red. No such value raises an error.
 
-The line of a **Line** and the fill of **BF** use the same rule, as does the circle of **Circle** and the point of **PSet**. Since BETA 984 an out-of-range value draws instead of raising an error: in BETA 983, a value such as `-1`, a top byte other than 0, 1, 2 or `&H80`, or a system colour index above 30 raised error 5.
+The line of a **Line** and the fill of **BF** use the same rule, as does the circle of **Circle** and the point of **PSet**.
 
 > [!WARNING]
-> BETA 995 has a defect in system colours. VB6 takes the system colour index from the low 16 bits of the value, so that `&H80010003` draws system colour 3 and `&H80FF000F` draws system colour 15. BETA 995 draws both black, without raising an error, because it reads the value as a system colour only when it lies between `&H80000000` and `&H8000001E`. BETA 983 drew them as VB6 does. Pass a system colour as one of the `vb` constants, such as `vbButtonFace`, or as `&H800000nn` with nothing in the second and third bytes.
+> BETA 995 has a defect in system colours. VB6 takes the system colour index from the low 16 bits of the value, so that `&H80010003` draws system colour 3 and `&H80FF000F` draws system colour 15. BETA 995 draws both black, without raising an error, because it reads the value as a system colour only when it lies between `&H80000000` and `&H8000001E`. Pass a system colour as one of the `vb` constants, such as `vbButtonFace`, or as `&H800000nn` with nothing in the second and third bytes.
 
 > [!NOTE]
 > VB6 draws `&H80000019` to `&H8000001E` black, where twinBASIC draws the system colour of that index. The rest of the rule, including the truncation of every other value to 24 bits, is the same.
diff --git a/docs/Reference/Core/LSet.md b/docs/Reference/Core/LSet.md
index e32a009b8..315d011fe 100644
--- a/docs/Reference/Core/LSet.md
+++ b/docs/Reference/Core/LSet.md
@@ -34,9 +34,6 @@ If *string* is longer than *stringvar*, **LSet** places only the leftmost charac
 > [!WARNING]
 > BETA 995 has a defect: **LSet** on an element of a **Variant** that holds an array, such as `LSet v(0) = "zz"` with `v = Array("0123456789", "abcde")` or a **Variant** that was given its bounds with **ReDim**, changes nothing and raises no error. VB6 changes the element. An element of an array declared `Dim w(0 To 1) As Variant` works. To change an element of a **Variant** array, copy it to a **String** variable, use **LSet** on the variable and assign the variable back.
 
-> [!NOTE]
-> Since BETA 984, **LSet** fills the leftover characters with spaces as described above. In BETA 983 and earlier it left the old characters of *stringvar* in place, so `LSet s = "ab"` on `"0123456789"` gave `"ab23456789"`.
-
 When copying between user-defined types, **LSet** copies as many bytes as the smaller of the two types holds. If *varname1* is larger than *varname2*, its bytes beyond the end of the source keep their old values. Both types must be free of variable-length **String**, **Variant**, **Object** and dynamic-array fields; the compiler refuses the statement otherwise (error TB5249). Fixed-length **String** fields are allowed.
 
 > [!WARNING]
diff --git a/docs/Reference/Core/RightShift.md b/docs/Reference/Core/RightShift.md
index 9aee0297d..5d8c01c97 100644
--- a/docs/Reference/Core/RightShift.md
+++ b/docs/Reference/Core/RightShift.md
@@ -30,9 +30,6 @@ Syntax:
 
 The data type of *result* matches the type of *number*, whatever the type of *count*; shifts do not follow the [promotion rules](../../Reference/Operators#result-types-and-promotion) of the arithmetic operators. The right shift of an **Integer**, **Long**, **LongLong** or **LongPtr** is *arithmetic*: vacated high-order bits are copies of the sign bit, so a negative *number* stays negative --- a **Long** holding -8, shifted right by 1, is -4, and one holding -7 also gives -4, rounding toward negative infinity where [**\\**](IntegerDivide) rounds toward zero. A **Byte** has no sign, and its vacated bits are filled with zero. Constants and variables give the same result. A shift by as many bits as the type holds, or more, yields `0`. A negative *count* raises no error, but gives no useful result.
 
-> [!NOTE]
-> Up to BETA 983, a variable was shifted *logically*, filling the vacated bits with zero, while constants were shifted arithmetically: a **Long** variable holding -8, shifted right by 1, gave 2147483644. BETA 984 made both arithmetic.
-
 > [!IMPORTANT]
 > Only the integral types are shifted bit by bit. With other types of *number*:
 >
diff --git a/docs/Reference/Default/VB/TextBox/index.md b/docs/Reference/Default/VB/TextBox/index.md
index abae16d0e..7f28370a6 100644
--- a/docs/Reference/Default/VB/TextBox/index.md
+++ b/docs/Reference/Default/VB/TextBox/index.md
@@ -390,7 +390,7 @@ The text shown in the control. **String**. **Default property.**
 
 Syntax: *object*.**Text** [ = *string* ]
 
-Assigning a value that differs from the current one raises one [**Change**](#change) event and refreshes the display. The comparison is case-sensitive, so changing `"abc"` to `"ABC"` raises the event. Assigning the same value, an empty string to an empty text box included, is a no-op and raises no event. Before BETA 984 an assignment raised **Change** twice. In multi-line mode, line breaks are stored using the platform's native newline encoding (`vbCrLf` on Windows).
+Assigning a value that differs from the current one raises one [**Change**](#change) event and refreshes the display. The comparison is case-sensitive, so changing `"abc"` to `"ABC"` raises the event. Assigning the same value, an empty string to an empty text box included, is a no-op and raises no event. In multi-line mode, line breaks are stored using the platform's native newline encoding (`vbCrLf` on Windows).
 
 ### TextHint
 {: .no_toc }

From 4efc4ec4f82b59dda9c8b51cdccc146530b61ffa Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 18:32:36 +0200
Subject: [PATCH 09/42] BUGS: a [RunAfterBuild] Sub does not run, and nothing
 says so, when a module is named like the project, in any letter case
 (reproducer bugs/module-named-like-project; VB6 refuses the name);
 WIP.ExamplesBuild.md and check_examples.mjs no longer call it an ambiguous
 call that the IDE refuses

---
 BUGS-TO-REPORT.md                             |  45 +++++++++++++
 WIP.ExamplesBuild.md                          |  11 +++-
 .../module-named-like-project.twinproj        | Bin 0 -> 2313 bytes
 bugs/module-named-like-project/repro.json     |  13 ++++
 bugs/module-named-like-project/src/Settings   |  61 ++++++++++++++++++
 .../src/Sources/ModuleNamedLikeProject.twin   |  12 ++++
 .../module-named-like-project/vb6/Module1.bas |  19 ++++++
 bugs/module-named-like-project/vb6/Probe.vbp  |   7 ++
 scripts/check_examples.mjs                    |   6 +-
 9 files changed, 168 insertions(+), 6 deletions(-)
 create mode 100644 bugs/module-named-like-project/module-named-like-project.twinproj
 create mode 100644 bugs/module-named-like-project/repro.json
 create mode 100644 bugs/module-named-like-project/src/Settings
 create mode 100644 bugs/module-named-like-project/src/Sources/ModuleNamedLikeProject.twin
 create mode 100644 bugs/module-named-like-project/vb6/Module1.bas
 create mode 100644 bugs/module-named-like-project/vb6/Probe.vbp

diff --git a/BUGS-TO-REPORT.md b/BUGS-TO-REPORT.md
index 2f770f074..01378d03b 100644
--- a/BUGS-TO-REPORT.md
+++ b/BUGS-TO-REPORT.md
@@ -1639,3 +1639,48 @@ In the default mode, MODERN, the console asks for the list after every key and a
 Severity: moderate. `Print`, `Call` and `Set` begin lines that are often typed in the console, and each becomes a line the console refuses. The only ways round it are Escape before the space and another IntelliSense mode.
 
 <!-- Asserted by `ide-test.bat --only console-space` (test/ide/console-space.test.mjs: with the run stopped at BREAK and each line typed key by key, Print total becomes Printertotal, Call Touch(total) becomes CallByDispId(Touch(total)) and Set obj = items becomes SetAttr(obj = items), and the console refuses each; Print, Escape and then the rest give Print total, which prints 5; total = 6, ? total and Debug.Print total type as they are; with no program running, Print 1 + 1 becomes Printer1 + 1); passes on BETA 995 and 987. The lane waits after each key for the console's answer to it, as a person typing at an ordinary speed sees the list. Checked on BETA 995 and 987 and not asserted: the other keywords named above. Checked on BETA 995 and not asserted: the LEGACY and MANUAL modes, and the code editor. The reproducer's Startup.twin is test/ide/probes/console-space/Sources/Startup.twin with a different header comment. Related: "The Debug Console offers no completion for a name typed after `?` and a space", whose Additional context mentions this one. When fixed: update that test and this entry. -->
+
+---
+
+## A `[RunAfterBuild]` Sub does not run, and nothing says so, when a module is named like the project
+
+**Describe the bug**
+When a module has the same name as the project, a `[RunAfterBuild]` Sub does not run, and nothing says so. The build succeeds and the exe is written. The DEBUG CONSOLE's last line is `[BUILD] Executing '<project>.<module>.<Sub>'...`, and nothing follows it: no message box, no entry in the error panel, no diagnostic, and the status bar is as it is after a run that works. The names are compared without regard to letter case, so `ProbeWS` and `probews` clash as well. Even an empty module with the project's name, beside the module that holds the Sub, stops it. Observed in the DEBUG CONSOLE after pressing Build.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `module-named-like-project.twinproj` (attached as `module-named-like-project.zip`). The project is named `ModuleNamedLikeProject` and has one module of that name:
+   ```
+   Module ModuleNamedLikeProject
+       Public Sub Main()
+       End Sub
+       [RunAfterBuild]
+       Public Sub Hello()
+           Debug.Cls
+           Debug.Print "RunAfterBuild ran"
+       End Sub
+   End Module
+   ```
+2. Build the project.
+3. Read the DEBUG CONSOLE. It ends at `[BUILD] Executing 'ModuleNamedLikeProject.ModuleNamedLikeProject.Hello'...`. `RunAfterBuild ran` is never printed.
+4. Rename the module, to `Runner` for example, and build again. The console is cleared and holds `RunAfterBuild ran`.
+
+**Expected behavior**
+The Sub runs whatever the modules are called, as it does once the module is renamed. If a module may not have the project's name, the compiler should refuse it with an error, as VB6 does, and not build the project and skip the Sub in silence.
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 997
+
+**Additional context**
+Also on BETA 995, identically.
+
+VB6 refuses a project whose module has the project's name. Its build stops with `Name conflicts with existing module, project, or object library`, for a module that holds `Sub Main` (the project is attached as `module-named-like-project-vb6.zip`) and for an empty module of that name beside the module that holds `Sub Main` (checked, not attached). So VB6 reports the clash, where twinBASIC accepts it and skips the Sub.
+
+What does not reproduce it: with any other module name, such as `Runner`, the Sub runs. A project with no module of the project's name runs it, whichever module holds it.
+
+What reproduces it besides the plain case: the clash in another letter case, such as a project `ProbeWS` with a module `probews`; and an empty module with the project's name in a project whose `[RunAfterBuild]` Sub is in a different module, `Runner`, where the console ends at `[BUILD] Executing 'ProbeWS.Runner.<Sub>'...`, which names an unambiguous Sub. So the cause is the module's name, not a call that cannot be told apart.
+
+Severity: moderate. A `[RunAfterBuild]` Sub runs after the exe is built, for example to sign it, and here it is skipped while the build reports success. Nothing points at the module's name as the cause, so the project's owner has to find it by renaming modules.
+
+<!-- Reproducer: bugs/module-named-like-project/ (mode run, exe true; expects exit 5, the console's `[BUILD] Executing 'ModuleNamedLikeProject.ModuleNamedLikeProject.<Sub>'...` line, and no `RunAfterBuild ran`); verified on BETA 995 and 997 by `bug_repro.mjs verify`, with a copy whose module is named Runner as the control (exit 0, `RunAfterBuild ran`, verify says NO LONGER REPRODUCES). `bug_repro.mjs run` needs --exe by hand, because a project may hold one [RunAfterBuild] (TB5114) and this one's own is the subject; verify takes exe from repro.json. The harness wraps the Sub, so run's console names `tbrun_RunProbe`; a build in the IDE names the Sub itself. Steps 3 and 4 were checked on BETA 995 and 997 by building the reproducer, and a copy with the module named Runner, with `tbbuild --build --keep` and reading the DEBUG CONSOLE. The other-case and empty-module variants were checked on BETA 995 and 997 in scratch trees that are not in the reproducer. VB6: `bug_repro.mjs vb6 module-named-like-project` prints the refusal; the empty-module form was built in a scratch copy. docs/Reference/Attributes.md (#runafterbuild) documents the attribute and carries no callout for this yet. WIP.ExamplesBuild.md (the bullet "No generated module may be named like the project") and scripts/check_examples.mjs (the comment on its three collision rules) state the rule for generated modules; they called the clash an ambiguous call that the IDE refuses at execution time, and were corrected with this entry. When fixed: say in both since which build the rule is no longer needed, or remove it. -->
diff --git a/WIP.ExamplesBuild.md b/WIP.ExamplesBuild.md
index 19fbf9856..7cef1ff1d 100644
--- a/WIP.ExamplesBuild.md
+++ b/WIP.ExamplesBuild.md
@@ -451,9 +451,14 @@ All are forced by putting unrelated samples in one compilation unit:
 - **`Sub Main` comes from the template, and a fence may bring its own as well.** Two
   `Public Sub Main`s in different modules compile, so the WinServicesLib `Module Startup`
   samples build as written. (A *build* adds a rule; see [`--build` and `--llvm`](#--build-and---llvm-what-a-compile-does-not-ask).)
-- **A generated module must not share a name with the project.** `project.name = "ProbeWS"`
-  beside `Module ProbeWS` makes `[RunAfterBuild]`'s `ProbeWS.ProbeWS.Probe` ambiguous, and
-  the IDE refuses it at *execution* time, so the build is green and nothing runs.
+- **No generated module may be named like the project, in any letter case.** With
+  `project.name = "ProbeWS"`, a `Module ProbeWS` or a `Module probews` stops the
+  `[RunAfterBuild]` Sub from running, even when it is empty and the Sub is in another module.
+  Nothing reports it: the build is green, and the DEBUG CONSOLE ends at `[BUILD] Executing
+  '<project>.<module>.<Sub>'...` (BETA 995 and 997; the BUGS-TO-REPORT.md entry with the
+  reproducer `bugs/module-named-like-project/`). The tool names each project `DocSamples<n>`
+  and every module it generates `tbx...`, so the two cannot meet; a sample that declared
+  `Module DocSamples3` would.
 
 **What collides is narrower than it looks, and guessing it wide is expensive.** Two
 generated modules may each declare `Public Function Foo`, `Public Type Rec` and `Public Const
diff --git a/bugs/module-named-like-project/module-named-like-project.twinproj b/bugs/module-named-like-project/module-named-like-project.twinproj
new file mode 100644
index 0000000000000000000000000000000000000000..0936cc3ac357487ff2820bbe820b81c1ff9de5ee
GIT binary patch
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diff --git a/bugs/module-named-like-project/repro.json b/bugs/module-named-like-project/repro.json
new file mode 100644
index 000000000..41fd2997b
--- /dev/null
+++ b/bugs/module-named-like-project/repro.json
@@ -0,0 +1,13 @@
+{
+  "mode": "run",
+  "exe": true,
+  "expect": {
+    "exit": 5,
+    "output": [
+      "^\\[BUILD\\] Executing 'ModuleNamedLikeProject\\.ModuleNamedLikeProject\\.\\w+'\\.\\.\\.$"
+    ],
+    "absent": [
+      "^RunAfterBuild ran$"
+    ]
+  }
+}
diff --git a/bugs/module-named-like-project/src/Settings b/bugs/module-named-like-project/src/Settings
new file mode 100644
index 000000000..aabccfd71
--- /dev/null
+++ b/bugs/module-named-like-project/src/Settings
@@ -0,0 +1,61 @@
+{
+	"configuration.inherits": "Defaults",
+	"project.appTitle": "ModuleNamedLikeProject",
+	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
+	"project.buildType": "Standard EXE",
+	"project.description": "Reproduces: A [RunAfterBuild] Sub does not run, and nothing says so, when a module is named like the project",
+	"project.exportPathIsV2": true,
+	"project.id": "{36F80D98-2C72-4F38-80C0-45BBD3314CCC}",
+	"project.name": "ModuleNamedLikeProject",
+	"project.optionExplicit": true,
+	"project.references": [
+		{
+			"id": "{00020430-0000-0000-C000-000000000046}",
+			"lcid": 0,
+			"name": "OLE Automation",
+			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
+			"path64": "C:\\Windows\\System32\\stdole2.tlb",
+			"symbolId": "stdole",
+			"versionMajor": 2,
+			"versionMinor": 0
+		},
+		{
+			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "VB",
+			"versionBuild": 0,
+			"versionMajor": 0,
+			"versionMinor": 0,
+			"versionRevision": 31
+		},
+		{
+			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "AppGlobalClassProject",
+			"versionBuild": 0,
+			"versionMajor": 1,
+			"versionMinor": 0,
+			"versionRevision": 0
+		}
+	],
+	"project.settingsVersion": 1,
+	"project.startupObject": "Sub Main",
+	"project.warnings": {
+		"errors": [],
+		"hints": [],
+		"ignored": [],
+		"info": [],
+		"warnings": []
+	},
+	"runtime.useUnicodeStandardLibrary": true
+}
diff --git a/bugs/module-named-like-project/src/Sources/ModuleNamedLikeProject.twin b/bugs/module-named-like-project/src/Sources/ModuleNamedLikeProject.twin
new file mode 100644
index 000000000..2611c83ae
--- /dev/null
+++ b/bugs/module-named-like-project/src/Sources/ModuleNamedLikeProject.twin
@@ -0,0 +1,12 @@
+Module ModuleNamedLikeProject
+
+    Public Sub Main()
+    End Sub
+
+    [RunAfterBuild]
+    Public Sub Hello()
+        Debug.Cls
+        Debug.Print "RunAfterBuild ran"
+    End Sub
+
+End Module
diff --git a/bugs/module-named-like-project/vb6/Module1.bas b/bugs/module-named-like-project/vb6/Module1.bas
new file mode 100644
index 000000000..0d5e5dd16
--- /dev/null
+++ b/bugs/module-named-like-project/vb6/Module1.bas
@@ -0,0 +1,19 @@
+Attribute VB_Name = "ModuleNamedLikeProject"
+Option Explicit
+
+' The VB6 side of the reproducer: a project named ModuleNamedLikeProject with a
+' standard module of the same name. VB6 has no [RunAfterBuild], so what is checked
+' is whether it accepts the name at all.
+' Build and run it with:  node scripts/bug_repro.mjs vb6 module-named-like-project
+
+Sub Main()
+    On Error GoTo Fail
+    Open App.Path & "\out.txt" For Output As #9
+    Print #9, "Sub Main ran, in a module named like the project"
+    Close #9
+    Exit Sub
+Fail:
+    On Error Resume Next
+    Print #9, "unhandled error " & Err.Number & ": " & Err.Description
+    Close #9
+End Sub
diff --git a/bugs/module-named-like-project/vb6/Probe.vbp b/bugs/module-named-like-project/vb6/Probe.vbp
new file mode 100644
index 000000000..1b4e6c124
--- /dev/null
+++ b/bugs/module-named-like-project/vb6/Probe.vbp
@@ -0,0 +1,7 @@
+Type=Exe
+Module=ModuleNamedLikeProject; Module1.bas
+Startup="Sub Main"
+ExeName32="Probe.exe"
+Name="ModuleNamedLikeProject"
+CompilationType=0
+OptimizationType=0
diff --git a/scripts/check_examples.mjs b/scripts/check_examples.mjs
index 38c7700da..9fbecf9f6 100644
--- a/scripts/check_examples.mjs
+++ b/scripts/check_examples.mjs
@@ -55,9 +55,9 @@
 //
 //   * one generated `Module tbx_<hash>` per fence, hashed from its id;
 //   * everything generated is Private -- eleven pages declare a `MyString`;
-//   * a generated module must not share a name with the project, or
-//     [RunAfterBuild]'s call becomes ambiguous and the IDE reports it at
-//     EXECUTION time, so the build is green and nothing runs.
+//   * a generated module must not be named like the project, in any letter
+//     case: the IDE then skips the [RunAfterBuild] Sub, even one in another
+//     module, and reports nothing, so the build is green and nothing runs.
 //
 // `Sub Main` is not one of them, though it was once listed as one. The template
 // brings a Main, and a sample may bring its own beside it: two `Public Sub

From 1d888bf4d3bf44b7b5749b917c2c9f4c22c0b8aa Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 18:40:15 +0200
Subject: [PATCH 10/42] Attributes.md: a WARNING on RunAfterBuild, which does
 not run, and nothing says so, when a module has the project's name (BETA 995
 and 997); the BUGS entry names the page

---
 BUGS-TO-REPORT.md            | 2 +-
 docs/Reference/Attributes.md | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/BUGS-TO-REPORT.md b/BUGS-TO-REPORT.md
index 01378d03b..3aee78263 100644
--- a/BUGS-TO-REPORT.md
+++ b/BUGS-TO-REPORT.md
@@ -1683,4 +1683,4 @@ What reproduces it besides the plain case: the clash in another letter case, suc
 
 Severity: moderate. A `[RunAfterBuild]` Sub runs after the exe is built, for example to sign it, and here it is skipped while the build reports success. Nothing points at the module's name as the cause, so the project's owner has to find it by renaming modules.
 
-<!-- Reproducer: bugs/module-named-like-project/ (mode run, exe true; expects exit 5, the console's `[BUILD] Executing 'ModuleNamedLikeProject.ModuleNamedLikeProject.<Sub>'...` line, and no `RunAfterBuild ran`); verified on BETA 995 and 997 by `bug_repro.mjs verify`, with a copy whose module is named Runner as the control (exit 0, `RunAfterBuild ran`, verify says NO LONGER REPRODUCES). `bug_repro.mjs run` needs --exe by hand, because a project may hold one [RunAfterBuild] (TB5114) and this one's own is the subject; verify takes exe from repro.json. The harness wraps the Sub, so run's console names `tbrun_RunProbe`; a build in the IDE names the Sub itself. Steps 3 and 4 were checked on BETA 995 and 997 by building the reproducer, and a copy with the module named Runner, with `tbbuild --build --keep` and reading the DEBUG CONSOLE. The other-case and empty-module variants were checked on BETA 995 and 997 in scratch trees that are not in the reproducer. VB6: `bug_repro.mjs vb6 module-named-like-project` prints the refusal; the empty-module form was built in a scratch copy. docs/Reference/Attributes.md (#runafterbuild) documents the attribute and carries no callout for this yet. WIP.ExamplesBuild.md (the bullet "No generated module may be named like the project") and scripts/check_examples.mjs (the comment on its three collision rules) state the rule for generated modules; they called the clash an ambiguous call that the IDE refuses at execution time, and were corrected with this entry. When fixed: say in both since which build the rule is no longer needed, or remove it. -->
+<!-- Reproducer: bugs/module-named-like-project/ (mode run, exe true; expects exit 5, the console's `[BUILD] Executing 'ModuleNamedLikeProject.ModuleNamedLikeProject.<Sub>'...` line, and no `RunAfterBuild ran`); verified on BETA 995 and 997 by `bug_repro.mjs verify`, with a copy whose module is named Runner as the control (exit 0, `RunAfterBuild ran`, verify says NO LONGER REPRODUCES). `bug_repro.mjs run` needs --exe by hand, because a project may hold one [RunAfterBuild] (TB5114) and this one's own is the subject; verify takes exe from repro.json. The harness wraps the Sub, so run's console names `tbrun_RunProbe`; a build in the IDE names the Sub itself. Steps 3 and 4 were checked on BETA 995 and 997 by building the reproducer, and a copy with the module named Runner, with `tbbuild --build --keep` and reading the DEBUG CONSOLE. The other-case and empty-module variants were checked on BETA 995 and 997 in scratch trees that are not in the reproducer. VB6: `bug_repro.mjs vb6 module-named-like-project` prints the refusal; the empty-module form was built in a scratch copy. docs/Reference/Attributes.md (#runafterbuild) carries a WARNING callout for this; once a fixed build is released, it becomes a NOTE saying since which build. WIP.ExamplesBuild.md (the bullet "No generated module may be named like the project") and scripts/check_examples.mjs (the comment on its three collision rules) state the rule for generated modules; they called the clash an ambiguous call that the IDE refuses at execution time, and were corrected with this entry. When fixed: say in both since which build the rule is no longer needed, or remove it. -->
diff --git a/docs/Reference/Attributes.md b/docs/Reference/Attributes.md
index b15c80d7b..3e0d20f3a 100644
--- a/docs/Reference/Attributes.md
+++ b/docs/Reference/Attributes.md
@@ -953,6 +953,9 @@ Specifies a function that runs after your exe is built. There's `App.LastBuildPa
 
 Only one **[RunAfterBuild]** is allowed per project. A second one is a compile error.
 
+> [!WARNING]
+> BETA 995 and 997 have a defect: when a module has the project's name, in any letter case, the **[RunAfterBuild]** procedure does not run, and nothing says so. The build succeeds, and the DEBUG CONSOLE ends at its `[BUILD] Executing '...'` line. An empty module of that name stops it as well, when the procedure is in another module. VB6 refuses a module of the project's name. Do not give a module the project's name.
+
 ## RunBeforeStartupObject
 {: #runbeforestartupobject }
 

From f7f11c0883b5aa8221e3673ed0e52f4714368821 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 19:20:44 +0200
Subject: [PATCH 11/42] #2442 fixed in BETA 997: packages lane tests a package
 with no Packages folder, reproducer and crash mentions removed; tick waits
 for TWINSERV rows and checks the references

---
 .../DocProbePkg-control.twinpack              | Bin 1178 -> 0 bytes
 .../DocProbePkg-nopackages.twinpack           | Bin 1024 -> 0 bytes
 .../REPORT.md                                 |  30 -----
 ...d-package-without-packages-folder.twinproj | Bin 2277 -> 0 bytes
 .../package/DocProbePkg/Settings              |  21 ---
 .../package/DocProbePkg/Sources/DocProbe.twin |   6 -
 .../repro.json                                |   6 -
 .../src/Settings                              |  61 ---------
 .../src/Sources/Startup.twin                  |   5 -
 docs/Features/Packages/Import-export tool.md  |   4 +-
 scripts/impexp.mjs                            |   5 +-
 scripts/impexp.py                             |   5 +-
 test/ide/packages.test.mjs                    | 126 +++++++++++++++---
 13 files changed, 112 insertions(+), 157 deletions(-)
 delete mode 100644 bugs/filed/embed-package-without-packages-folder/DocProbePkg-control.twinpack
 delete mode 100644 bugs/filed/embed-package-without-packages-folder/DocProbePkg-nopackages.twinpack
 delete mode 100644 bugs/filed/embed-package-without-packages-folder/REPORT.md
 delete mode 100644 bugs/filed/embed-package-without-packages-folder/embed-package-without-packages-folder.twinproj
 delete mode 100644 bugs/filed/embed-package-without-packages-folder/package/DocProbePkg/Settings
 delete mode 100644 bugs/filed/embed-package-without-packages-folder/package/DocProbePkg/Sources/DocProbe.twin
 delete mode 100644 bugs/filed/embed-package-without-packages-folder/repro.json
 delete mode 100644 bugs/filed/embed-package-without-packages-folder/src/Settings
 delete mode 100644 bugs/filed/embed-package-without-packages-folder/src/Sources/Startup.twin

diff --git a/bugs/filed/embed-package-without-packages-folder/DocProbePkg-control.twinpack b/bugs/filed/embed-package-without-packages-folder/DocProbePkg-control.twinpack
deleted file mode 100644
index cf3aa1cbe2e529ae4343a7903b7b7ce6d1027d8e..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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diff --git a/bugs/filed/embed-package-without-packages-folder/DocProbePkg-nopackages.twinpack b/bugs/filed/embed-package-without-packages-folder/DocProbePkg-nopackages.twinpack
deleted file mode 100644
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GIT binary patch
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diff --git a/bugs/filed/embed-package-without-packages-folder/REPORT.md b/bugs/filed/embed-package-without-packages-folder/REPORT.md
deleted file mode 100644
index 228d0216a..000000000
--- a/bugs/filed/embed-package-without-packages-folder/REPORT.md
+++ /dev/null
@@ -1,30 +0,0 @@
-Filed as [twinbasic/twinbasic#2442](https://github.com/twinbasic/twinbasic/issues/2442).
-
-## Embedding a package with no `Packages` folder puts the compiler in a crash loop
-
-**Describe the bug**
-A `.twinpack` whose tree has no `Packages` folder, imported through Settings → References → Available Packages → **Import from file...**, ticked and applied, makes the compiler crash on each restart: `restarting from FILE` four times about two seconds apart, and then the IDE reports "Compiler crash loop detected. Restarting in SAFE mode."
-
-**To Reproduce**
-The package is invalid input, and it crashes the compiler four times: use an IDE you can restart.
-
-Steps to reproduce the behavior:
-1. Open `embed-package-without-packages-folder.twinproj` (attached as `embed-package-without-packages-folder.zip`). The package is in the second attachment, `DocProbePkg-nopackages.zip`: `DocProbePkg-nopackages.twinpack`, a package of one function, packed by `twinBASIC_win32.exe import` from a tree with a `Settings` file and `Sources\DocProbe.twin` and no other folder (the tree is `package\DocProbePkg` in the reproducer). The `import` verb writes `<name>.twinproj`; the file was renamed to `.twinpack`. The tree may lack `ImportedTypeLibraries` and `Miscellaneous` as well; neither matters.
-2. In the project, Settings → References → Available Packages → **Import from file...** `DocProbePkg-nopackages.twinpack`, tick it, and **Apply**.
-3. The Debug Console shows `[PROJECT] twinBASIC project saving to disk [DONE]`, then `restarting from FILE` four times about two seconds apart, and the IDE reports "Compiler crash loop detected. Restarting in SAFE mode."
-
-**Expected behavior**
-The compiler embeds the package, or refuses it with a diagnostic, and does not crash.
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-Severity: low. The input is invalid, and nothing in a normal workflow makes it: every package the IDE writes has the folder, and `scripts/impexp.mjs` and `impexp.py` add it when a tree lacks it. A crash is still a poor answer to it.
-
-An empty `Packages` folder in the package tree is enough to prevent it: the same steps with that folder alone, or with all three (`DocProbePkg-control.twinpack` in the same attachment, which `impexp.mjs` made), restart the compiler once and run the package.
-
-What does not reproduce it: a project with the same package already embedded under `Packages\DocProbePkg`, without the folder, and opened cold compiles clean (also on BETA 983). So the loop needs the package to be embedded by the IDE. BETA 983 has not been tried through the IDE: in a lane its References page never finishes loading.
-
-<!-- Measured on BETA 995 with the packages lane's host and package, with the package's three empty folders varied one at a time: only the missing `Packages` folder made the lane's embedding Apply end in the crash loop, and one run was watched with --show. That variant is no longer in the lane, because test/ide/packages.test.mjs now packs DocProbePkg with impexp.mjs, which adds the folders (its header comment says why), so no lane asserts this entry today; the reproducer's package (made with the tB executable, no folders at all) and the host project were not run through the IDE again. Retry by hand, or put the variant back into the lane, before filing. When fixed: update the header comment of test/ide/packages.test.mjs. The two package zips are not in git; make them from the .twinpack files. -->
diff --git a/bugs/filed/embed-package-without-packages-folder/embed-package-without-packages-folder.twinproj b/bugs/filed/embed-package-without-packages-folder/embed-package-without-packages-folder.twinproj
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GIT binary patch
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diff --git a/bugs/filed/embed-package-without-packages-folder/package/DocProbePkg/Settings b/bugs/filed/embed-package-without-packages-folder/package/DocProbePkg/Settings
deleted file mode 100644
index 5811b67c9..000000000
--- a/bugs/filed/embed-package-without-packages-folder/package/DocProbePkg/Settings
+++ /dev/null
@@ -1,21 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Package TWINPACK",
-	"project.description": "A package of one function, DocProbeVersion, for a bug report.",
-	"project.id": "{7B247500-0000-4000-9000-7B2475000004}",
-	"project.licence": "MIT",
-	"project.name": "DocProbePkg",
-	"project.optionExplicit": true,
-	"project.packageVisibility": "PUBLIC",
-	"project.references": [],
-	"project.versionBuild": 0,
-	"project.versionMajor": 1,
-	"project.versionMinor": 0,
-	"project.versionRevision": 0,
-	"project.warnings": {
-		"errors": [],
-		"ignored": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/embed-package-without-packages-folder/package/DocProbePkg/Sources/DocProbe.twin b/bugs/filed/embed-package-without-packages-folder/package/DocProbePkg/Sources/DocProbe.twin
deleted file mode 100644
index 2f81c56cb..000000000
--- a/bugs/filed/embed-package-without-packages-folder/package/DocProbePkg/Sources/DocProbe.twin
+++ /dev/null
@@ -1,6 +0,0 @@
-' The package of the report: one function, DocProbeVersion, which returns 1.
-Module DocProbe
-    Public Function DocProbeVersion() As Long
-        Return 1
-    End Function
-End Module
diff --git a/bugs/filed/embed-package-without-packages-folder/repro.json b/bugs/filed/embed-package-without-packages-folder/repro.json
deleted file mode 100644
index 67a162598..000000000
--- a/bugs/filed/embed-package-without-packages-folder/repro.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "mode": "manual",
-  "attach": ["DocProbePkg-nopackages.twinpack", "DocProbePkg-control.twinpack"],
-  "steps": "Invalid input, and it crashes the compiler four times: use an IDE you can restart.\n1. Unzip embed-package-without-packages-folder.zip (pack writes it; the issue has the project and the packages as two attachments), which holds embed-package-without-packages-folder.twinproj, DocProbePkg-nopackages.twinpack, made by \"<IDE>\\bin\\twinBASIC_win32.exe\" import from package/DocProbePkg, a tree that has no Packages folder, and DocProbePkg-control.twinpack. Open the project.\n2. Project Settings > References > Available Packages > Import from file... DocProbePkg-nopackages.twinpack; tick the package; Apply.\n3. See, in the DEBUG CONSOLE, [PROJECT] twinBASIC project saving to disk [DONE], then restarting from FILE four times about two seconds apart, and the IDE reports \"Compiler crash loop detected. Restarting in SAFE mode.\"\nControl: the same steps with DocProbePkg-control.twinpack (made by scripts/impexp.mjs, which adds the empty Packages, ImportedTypeLibraries and Miscellaneous folders): the compiler restarts once and runs the package.\nMeasured on BETA 995 earlier this session with the packages lane's host and package, with the package's three empty folders varied one at a time; `ide-test.bat` now packs the package with impexp.mjs, which adds the folders, so no lane reproduces the crash today.",
-  "issue": 2442
-}
diff --git a/bugs/filed/embed-package-without-packages-folder/src/Settings b/bugs/filed/embed-package-without-packages-folder/src/Settings
deleted file mode 100644
index 815a8b85a..000000000
--- a/bugs/filed/embed-package-without-packages-folder/src/Settings
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "EmbedPackageWithoutPackagesFolder",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard EXE",
-	"project.description": "Reproduces: Embedding a package with no `Packages` folder puts the compiler in a crash loop",
-	"project.exportPathIsV2": true,
-	"project.id": "{40E080EA-E880-41FF-A7F2-C2D9A63B5696}",
-	"project.name": "EmbedPackageWithoutPackagesFolder",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"symbolId": "stdole",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "VB",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 31
-		},
-		{
-			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "AppGlobalClassProject",
-			"versionBuild": 0,
-			"versionMajor": 1,
-			"versionMinor": 0,
-			"versionRevision": 0
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.startupObject": "Sub Main",
-	"project.warnings": {
-		"errors": [],
-		"hints": [],
-		"ignored": [],
-		"info": [],
-		"warnings": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/embed-package-without-packages-folder/src/Sources/Startup.twin b/bugs/filed/embed-package-without-packages-folder/src/Sources/Startup.twin
deleted file mode 100644
index 20eabc893..000000000
--- a/bugs/filed/embed-package-without-packages-folder/src/Sources/Startup.twin
+++ /dev/null
@@ -1,5 +0,0 @@
-' The project the report imports DocProbePkg into. Main stays empty until the package is referenced.
-Module Startup
-    Public Sub Main()
-    End Sub
-End Module
diff --git a/docs/Features/Packages/Import-export tool.md b/docs/Features/Packages/Import-export tool.md
index ea5476261..26df4dbfc 100644
--- a/docs/Features/Packages/Import-export tool.md	
+++ b/docs/Features/Packages/Import-export tool.md	
@@ -137,9 +137,7 @@ IDE exports has `ImportedTypeLibraries`, `Miscellaneous`, `Packages`, `Resources
 folders, even when they are empty. Git does not store an empty folder, so a tree checked out
 from a repository usually lacks some of them. `import` adds each missing one as an empty folder,
 in the project and in each package under its `Packages` folder, and lists what it added. The
-folder on disk is not changed. A package without its `Packages` folder is not only incomplete:
-once the IDE embeds it in a project, the IDE's compiler crashes each time it restarts, and
-after four tries the IDE starts in Safe Mode.
+folder on disk is not changed.
 
 ## Checking the result
 
diff --git a/scripts/impexp.mjs b/scripts/impexp.mjs
index 40675b2f5..45353c594 100644
--- a/scripts/impexp.mjs
+++ b/scripts/impexp.mjs
@@ -98,9 +98,8 @@ const GIT_NAME = ".git";
 
 // The folders the IDE writes into every project and package it exports, even
 // when they are empty. Git keeps no empty folder, so a tree cloned from a
-// repository lacks them, and the IDE's compiler crashes in a loop on a package
-// with no Packages folder once it is embedded. Import adds any that are
-// missing, to the project and to each package under its Packages folder.
+// repository lacks them. Import adds any that are missing, to the project and
+// to each package under its Packages folder.
 const STANDARD_FOLDERS = ["ImportedTypeLibraries", "Miscellaneous", "Packages", "Resources", "Sources"];
 
 const PROJECT_FILE = /\.(twinproj|twinpack)$/i;
diff --git a/scripts/impexp.py b/scripts/impexp.py
index 8f9944f2e..2be77cd5e 100644
--- a/scripts/impexp.py
+++ b/scripts/impexp.py
@@ -90,9 +90,8 @@
 
 # The folders the IDE writes into every project and package it exports, even
 # when they are empty. Git keeps no empty folder, so a tree cloned from a
-# repository lacks them, and the IDE's compiler crashes in a loop on a package
-# with no Packages folder once it is embedded. Import adds any that are
-# missing, to the project and to each package under its Packages folder.
+# repository lacks them. Import adds any that are missing, to the project and
+# to each package under its Packages folder.
 STANDARD_FOLDERS = ('ImportedTypeLibraries', 'Miscellaneous', 'Packages',
                     'Resources', 'Sources')
 
diff --git a/test/ide/packages.test.mjs b/test/ide/packages.test.mjs
index e781e6718..9f1c4eac6 100644
--- a/test/ide/packages.test.mjs
+++ b/test/ide/packages.test.mjs
@@ -37,6 +37,10 @@ const PKG = path.join(HERE, "probes", "packages", "DocProbePkg");
 
 // The open Settings editor's working copy of the project's settings.
 const CONFIG_JS = `[...document.querySelectorAll("*")].find((e) => e.globalVars?.configData)?.globalVars`;
+// The working copy's references, by symbol. A tick or an untick changes it at once.
+const REFERENCES_JS = `${CONFIG_JS}.configData["project.references"].map((r) => r.symbolId ?? r.name)`;
+// Every row of the References page, as text, to tell when the lists stop changing.
+const ALL_ROWS_JS = `[...document.querySelectorAll(".referencesListRow")].map((r) => r.parentElement.className + " " + r.textContent).join("\\n")`;
 // The compiler's requests still waiting for an answer.
 const WAITING_JS = `Object.keys(debugSocket.requestsAwaitingResponse).length`;
 
@@ -102,9 +106,7 @@ scenario("Import from file... in the Packages dialog", (lane) => {
       ),
     );
     assert.ok(listed, "DocProbePkg is not in the Available Packages list");
-    const referenced = await c.evaluate(
-      `${CONFIG_JS}.configData["project.references"].map((r) => r.symbolId ?? r.name)`,
-    );
+    const referenced = await c.evaluate(REFERENCES_JS);
     assert.ok(!referenced.includes("DocProbePkg"), "the imported package is now ticked");
   });
 });
@@ -120,10 +122,11 @@ scenario("Import from file... in the Packages dialog", (lane) => {
 // Both versions are generated into the lane's work folder from the v1 tree at
 // probes/packages/DocProbePkg, which the first test above uses as it is. v2
 // has its version fields in Settings at 2.0.0.0 and its function returns 2.
-// impexp.mjs adds the empty folders every exported package has; without its
-// Packages folder, BETA 995's compiler crashes on each restart after the
-// embedding Apply, and the IDE drops into Safe Mode, where nothing runs
-// (twinbasic/twinbasic#2442). Each test works on a copy of the host project in its own folder,
+// impexp.mjs adds the empty folders every exported package has, so the tests
+// above pack the package with its Packages folder. One test embeds a package
+// with no Packages folder, made by cutting that folder out of the packed file,
+// and the compiler must not crash on it (twinbasic/twinbasic#2442). Each test
+// works on a copy of the host project in its own folder,
 // because applying writes the project's settings. The copy's Main is empty
 // until v1 is embedded, since the host cannot compile before the package is
 // referenced; the test then writes Main in the editor.
@@ -153,10 +156,38 @@ const INSTALLED = "referencesListNew";
 const AVAILABLE = "referencesListNewAvailable";
 const DESCRIPTION = "DocProbePkg.twinpack";
 
+// A packed project or package without its empty Packages folder. impexp adds
+// the folder to every tree it packs, and a folder that is not in the tree
+// cannot be left out, so the folder's entry is cut out of the packed file: a
+// directory entry is an Int16 kind (2), the name as a length-prefixed string, an
+// Int64 revision, an Int32 flags, a category byte (7 for Packages) and an Int32
+// child count (0), and the root's own child count is the Int32 after the root's
+// header.
+function withoutPackagesFolder(packed) {
+  const name = Buffer.from("Packages");
+  const entry = Buffer.concat([
+    Buffer.from([2, 0, name.length, 0, 0, 0]),
+    name,
+    Buffer.alloc(8 + 4), // revision, flags
+    Buffer.from([7]),
+    Buffer.alloc(4), // no children
+  ]);
+  const at = packed.indexOf(entry);
+  assert.ok(at > 0 && packed.indexOf(entry, at + 1) < 0, "the packed file has no single empty Packages folder");
+  // magic (4), format version (2), name (4 + n), revision (8), flags (4), category (1), child count (4).
+  const rootNameLength = packed.readUInt32LE(6);
+  const countAt = 6 + 4 + rootNameLength + 8 + 4 + 1;
+  const count = packed.readUInt32LE(countAt);
+  const out = Buffer.concat([packed.subarray(0, at), packed.subarray(at + entry.length)]);
+  out.writeUInt32LE(count - 1, countAt);
+  return out;
+}
+
 scenario("Replacing an embedded package", (lane) => {
   let c;
   let v1;
   let v2;
+  let bare;
   const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
 
   // A copy of the v1 tree in the work folder for `version`, packed to a
@@ -179,6 +210,9 @@ scenario("Replacing an embedded package", (lane) => {
   before(() => {
     v1 = packVersion(1);
     v2 = packVersion(2);
+    // v1 with the Packages folder cut out.
+    bare = path.join(lane.work, "DocProbePkg-nopackages.twinpack");
+    writeFileSync(bare, withoutPackagesFolder(readFileSync(v1)));
   });
 
   // Open the Settings editor on the References page, and wait for it to load.
@@ -192,8 +226,25 @@ scenario("Replacing an embedded package", (lane) => {
   }
 
   // Click the tick box of the row in `list` that names a package and is in
-  // the state `ticked`, with a real click, as a person does.
+  // the state `ticked`, with a real click, as a person does. Available
+  // Packages also lists TWINSERV's packages, which arrive by a request the
+  // page does not count as pending; a click while they are being added lands
+  // on another row and ticks another package. So the click waits until the
+  // rows have stopped changing, and must change the references by DocProbePkg
+  // and nothing else.
   async function tick(name, { ticked, list }) {
+    let rows = null;
+    let since = 0;
+    const stable = await waitFor(
+      c,
+      async () => {
+        const now = await c.evaluate(ALL_ROWS_JS);
+        if (now !== rows) [rows, since] = [now, Date.now()];
+        return Date.now() - since >= 2000;
+      },
+      { timeout: 30 * 1000 },
+    );
+    assert.ok(stable, "the References page's rows never stopped changing");
     const find = `(() => {
       const r = [...document.querySelectorAll(".referencesListRow")].find((r) =>
         r.querySelector(".referencesListColName2, .referencesListColSymbol")?.textContent.includes(${JSON.stringify(name)})
@@ -210,8 +261,16 @@ scenario("Replacing an embedded package", (lane) => {
       where,
       `no ${ticked ? "ticked" : "unticked"} row for ${name} in ${list}: ${JSON.stringify(await c.evaluate(ROWS_JS))}`,
     );
+    const before = await c.evaluate(REFERENCES_JS);
     await clickAt(c, where.x, where.y);
     await sleep(1500);
+    const after = await c.evaluate(REFERENCES_JS);
+    const expected = ticked ? before.filter((r) => r !== "DocProbePkg") : [...before, "DocProbePkg"];
+    assert.deepEqual(
+      after.toSorted(),
+      expected.toSorted(),
+      `after the click on ${name} the references are ${JSON.stringify(after)}, where they were ${JSON.stringify(before)}`,
+    );
   }
 
   // Import a package through Available Packages, as the first test does.
@@ -236,7 +295,9 @@ scenario("Replacing an embedded package", (lane) => {
       "the Settings editor stayed open",
     );
     await sleep(2000);
-    await settle({ errors });
+    await settle({ errors }).catch(async (e) => {
+      throw new Error(`${e.message}\nthe console since the Apply: ${JSON.stringify(await linesSince(c, mark))}`);
+    });
     return linesSince(c, mark);
   }
 
@@ -266,24 +327,34 @@ scenario("Replacing an embedded package", (lane) => {
     return Number(lines.find((x) => x.startsWith(VERSION_PREFIX)).slice(VERSION_PREFIX.length));
   }
 
-  // The entry's three steps on a project of its own, and what each Apply
-  // wrote to the console. `applyAfterUntick` is the control.
-  async function replace(name, applyAfterUntick) {
+  // Open a copy of the host project in a folder of its own, embed `file` in it:
+  // import it, tick it, one Apply; then run Main. Returns what the Apply wrote
+  // to the console and what the run printed.
+  async function embed(name, file) {
     const host = path.join(lane.work, name);
     cpSync(HOST, host, { recursive: true });
     c = await lane.open(host, { folder: path.join(lane.work, `${name}-staged`) });
-    const applies = {};
-
-    // Step 1: embed v1: import it, tick it, one Apply.
     await openReferences();
-    await importFile(v1);
+    await importFile(file);
     await tick(DESCRIPTION, { ticked: false, list: AVAILABLE });
-    applies.embed = await apply();
+    const applied = await apply();
     await openFile(c, "/PackagesProbe/Sources/Startup.twin");
     await c.evaluate(`editor.getModel().setValue(${JSON.stringify(RUN_MAIN)})`);
     await sleep(3000);
-    await settle();
-    const first = await runVersion();
+    await settle().catch((e) => {
+      throw new Error(`${e.message}\nthe Apply wrote: ${JSON.stringify(applied)}`);
+    });
+    return { applied, version: await runVersion() };
+  }
+
+  // The entry's three steps on a project of its own, and what each Apply
+  // wrote to the console. `applyAfterUntick` is the control.
+  async function replace(name, applyAfterUntick) {
+    const applies = {};
+
+    // Step 1: embed v1.
+    const { applied, version: first } = await embed(name, v1);
+    applies.embed = applied;
 
     // Step 2: untick v1, import v2, tick v2.
     await openReferences();
@@ -324,4 +395,21 @@ scenario("Replacing an embedded package", (lane) => {
     assert.deepEqual(r.applies.replace, ["[COMPILER] Project settings updated"]);
     assert.equal(r.second, 1, "v2 runs after one Apply: the bug looks fixed, so update BUGS-TO-REPORT.md");
   });
+
+  // twinbasic/twinbasic#2442: a package with no Packages folder, embedded by
+  // the IDE, must not put the compiler in a crash loop. The Apply restarts the
+  // compiler once, as the control's does, the IDE does not fall into Safe Mode,
+  // and the package runs.
+  test("a package with no Packages folder embeds: one restart, no crash loop, and the package runs", async () => {
+    const r = await embed("nopackages", bare).finally(() => lane.closeProject());
+    const crashed = r.applied.filter((l) => /crash loop|SAFE mode/i.test(l));
+    assert.deepEqual(crashed, [], "the compiler crashed after the Apply");
+    assert.ok(restarted(r.applied) && saved(r.applied), "the Apply did not restart and save");
+    assert.equal(
+      r.applied.filter((l) => /restarting from FILE/.test(l)).length,
+      1,
+      "the compiler restarted more than once",
+    );
+    assert.equal(r.version, 1, "the package does not run");
+  });
 });

From 01a5beb2f5dda0fc96f0c75585c7d18f19b78230 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 19:26:31 +0200
Subject: [PATCH 12/42] Open defect callouts name BETA 997, where every
 automatic reproducer still fails; two feature-arrival notes removed
 (ThisCall/FastCall, OnChangedActiveEditor)

---
 docs/Features/Advanced/API-Declarations.md            | 5 +----
 docs/Reference/Built-In/tbIDE/Host.md                 | 2 +-
 docs/Reference/COM-Interfaces/IConnectionPoint.md     | 6 +++---
 docs/Reference/COM-Interfaces/IDispatch.md            | 2 +-
 docs/Reference/COM-Interfaces/IEnumVARIANT.md         | 2 +-
 docs/Reference/COM-Interfaces/IErrorInfo.md           | 4 ++--
 docs/Reference/COM-Interfaces/IUnknown.md             | 2 +-
 docs/Reference/Core/Delegate.md                       | 2 +-
 docs/Reference/Core/Graphics-Methods.md               | 2 +-
 docs/Reference/Core/LSet.md                           | 2 +-
 docs/Reference/Core/New.md                            | 2 +-
 docs/Reference/Core/RSet.md                           | 2 +-
 docs/Reference/Default/VB/CheckBox/index.md           | 4 ++--
 docs/Reference/Default/VB/CheckMark/index.md          | 2 +-
 docs/Reference/Default/VB/ComboBox/index.md           | 4 ++--
 docs/Reference/Default/VB/CommandButton/index.md      | 4 ++--
 docs/Reference/Default/VB/Data/index.md               | 4 ++--
 docs/Reference/Default/VB/DirListBox/index.md         | 4 ++--
 docs/Reference/Default/VB/DriveListBox/index.md       | 4 ++--
 docs/Reference/Default/VB/FileListBox/index.md        | 4 ++--
 docs/Reference/Default/VB/Form/index.md               | 6 +++---
 docs/Reference/Default/VB/Frame/index.md              | 4 ++--
 docs/Reference/Default/VB/Label/index.md              | 4 ++--
 docs/Reference/Default/VB/ListBox/index.md            | 4 ++--
 docs/Reference/Default/VB/MultiFrame/index.md         | 2 +-
 docs/Reference/Default/VB/OLE/index.md                | 2 +-
 docs/Reference/Default/VB/OptionButton/index.md       | 4 ++--
 docs/Reference/Default/VB/PictureBox/index.md         | 6 +++---
 docs/Reference/Default/VB/Printer/index.md            | 4 ++--
 docs/Reference/Default/VB/PropertyPage/index.md       | 6 +++---
 docs/Reference/Default/VB/QRCode/index.md             | 2 +-
 docs/Reference/Default/VB/Report/index.md             | 6 +++---
 docs/Reference/Default/VB/Shape/index.md              | 4 ++--
 docs/Reference/Default/VB/TextBox/index.md            | 6 +++---
 docs/Reference/Default/VB/UserControl/index.md        | 6 +++---
 docs/Reference/Default/VBA/ErrObject/Description.md   | 2 +-
 docs/Reference/Default/VBA/ErrObject/Raise.md         | 2 +-
 docs/Reference/Default/VBA/ErrObject/Source.md        | 2 +-
 docs/Reference/Default/VBRUN/ErrorCallstack/index.md  | 2 +-
 docs/Reference/Default/VBRUN/ErrorContext/index.md    | 2 +-
 docs/Reference/Default/VBRUN/ErrorStackFrame/index.md | 2 +-
 41 files changed, 69 insertions(+), 72 deletions(-)

diff --git a/docs/Features/Advanced/API-Declarations.md b/docs/Features/Advanced/API-Declarations.md
index a9191e1af..253558eff 100644
--- a/docs/Features/Advanced/API-Declarations.md
+++ b/docs/Features/Advanced/API-Declarations.md
@@ -40,9 +40,6 @@ A 64-bit build has only one calling convention. There, all four keywords are acc
 
 Name at most one convention. BETA 995 accepts two together without a diagnostic.
 
-> [!NOTE]
-> BETA 990 added **ThisCall** and **FastCall** in interface definitions, and BETA 992 everywhere else; earlier builds refuse them (TB5182).
-
 ### Examples
 
 An API declaration, here with **DeclareWide**:
@@ -103,7 +100,7 @@ End Class
 A callback passed to an API must use the convention the API calls it with. Declare a [**Delegate**](../../tB/Core/Delegate) with that convention, use it as the parameter type, and give the target procedure the same keyword. [**AddressOf**](../../tB/Core/AddressOf) of a procedure with a different convention is accepted with a warning only (TB0026).
 
 > [!NOTE]
-> In BETA 995, on a 32-bit build, a call made from twinBASIC code *through* a **ThisCall** or **FastCall** delegate passes its arguments as stdcall does, and fails with *Bad DLL definition*. Calling the procedure directly works. **CDecl** delegates are not affected, and neither is a 64-bit build.
+> In BETA 997, on a 32-bit build, a call made from twinBASIC code *through* a **ThisCall** or **FastCall** delegate passes its arguments as stdcall does, and fails with *Bad DLL definition*. Calling the procedure directly works. **CDecl** delegates are not affected, and neither is a 64-bit build.
 
 The following example performs a quicksort using the C runtime's [`qsort` function](https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/qsort), which calls its comparator with the cdecl convention:
 
diff --git a/docs/Reference/Built-In/tbIDE/Host.md b/docs/Reference/Built-In/tbIDE/Host.md
index 8133164eb..b7d8d2f3e 100644
--- a/docs/Reference/Built-In/tbIDE/Host.md
+++ b/docs/Reference/Built-In/tbIDE/Host.md
@@ -151,7 +151,7 @@ End Sub
 ### OnChangedActiveEditor
 {: .no_toc }
 
-Fires when the user switches the focused editor. The event is the right hook for refreshing any addin UI that depends on the current editor (e.g. a context-aware tool window). Available since IDE BETA 504+; older IDEs do not fire it.
+Fires when the user switches the focused editor. The event is the right hook for refreshing any addin UI that depends on the current editor (e.g. a context-aware tool window).
 
 Syntax: *host*_**OnChangedActiveEditor**(*EditorIdx* **As Long**, *Editor* **As** [**Editor**](Editor))
 
diff --git a/docs/Reference/COM-Interfaces/IConnectionPoint.md b/docs/Reference/COM-Interfaces/IConnectionPoint.md
index 1a4b11f5a..c84b743cf 100644
--- a/docs/Reference/COM-Interfaces/IConnectionPoint.md
+++ b/docs/Reference/COM-Interfaces/IConnectionPoint.md
@@ -127,10 +127,10 @@ In twinBASIC:
 - Cookies start at 1 for each source object and increase by one for every connection made. A cookie is not used again after its connection ends.
 - A sink that does not answer for the outgoing interface fails with `E_NOINTERFACE` (`&H80004002`), where the COM contract names `CONNECT_E_CANNOTCONNECT`. VB6 returns `E_NOINTERFACE` too. An object of an ordinary twinBASIC class is such a sink, even when the class implements **IDispatch**, and so is a class declared **NotDispatchable** that implements it. A twinBASIC class cannot answer for the identifier, because the identifier of a class's event interface changes with every build and so cannot be declared. A sink that works is the object twinBASIC creates for a **WithEvents** variable, which **EnumConnections** returns (see the example).
 - A sink that is already connected to the point is not connected a second time. **Advise** raises no error, returns 0, and adds nothing.
-- Passing **Nothing** is a defect in BETA 995, described in the warning below.
+- Passing **Nothing** is a defect in BETA 997, described in the warning below.
 
 > [!WARNING]
-> BETA 995 has a defect: **Advise** with **Nothing** as the sink ends the program with an access violation, and any unsaved data is lost. The COM contract returns `E_POINTER`. VB6 ends with an access violation as well. Test the sink for **Nothing** before calling **Advise**.
+> BETA 997 has a defect: **Advise** with **Nothing** as the sink ends the program with an access violation, and any unsaved data is lost. The COM contract returns `E_POINTER`. VB6 ends with an access violation as well. Test the sink for **Nothing** before calling **Advise**.
 
 ### Unadvise
 {: .no_toc }
@@ -145,7 +145,7 @@ Syntax: *object*.**Unadvise** *dwCookie*
 The connection point releases the reference it held to the sink, and the source stops calling it. An event that the source raises afterwards does not reach that sink.
 
 > [!WARNING]
-> BETA 995 has a defect: **Unadvise** with a cookie that names no connection, 0 included, succeeds and does nothing, where the COM contract returns an error (`E_POINTER`). VB6 returns `CONNECT_E_NOCONNECTION` (`&H80040200`) for a cookie it never issued. A caller that releases a connection twice, or with a wrong cookie, is told that it worked.
+> BETA 997 has a defect: **Unadvise** with a cookie that names no connection, 0 included, succeeds and does nothing, where the COM contract returns an error (`E_POINTER`). VB6 returns `CONNECT_E_NOCONNECTION` (`&H80040200`) for a cookie it never issued. A caller that releases a connection twice, or with a wrong cookie, is told that it worked.
 
 A **WithEvents** variable whose connection was ended with **Unadvise** can still be set to **Nothing** without an error.
 
diff --git a/docs/Reference/COM-Interfaces/IDispatch.md b/docs/Reference/COM-Interfaces/IDispatch.md
index d9d4c5b10..ad677bffd 100644
--- a/docs/Reference/COM-Interfaces/IDispatch.md
+++ b/docs/Reference/COM-Interfaces/IDispatch.md
@@ -231,7 +231,7 @@ The four [**VbCallType**](../../tB/Modules/Constants/VbCallType) values are the
 > In VBA an unknown member raises error 438. In twinBASIC it raises `&H80020006`, so an error handler that tests for 438 does not catch it. This holds for objects of any origin: a twinBASIC class, a **Collection**, a **Dictionary** and a **FileSystemObject** all behave alike.
 
 > [!WARNING]
-> BETA 995 has a defect: a call that fails inside **Invoke** can be made twice, so its side effects happen twice and nothing says so. VB6 makes the call once. A failed property assignment is followed by a second **Invoke** with *wFlags* 3. A call with more arguments than a **Sub** takes runs the **Sub**, then fails with error 13, and a late-bound statement does this twice. Code that implements **Invoke** must not change state before it can still fail.
+> BETA 997 has a defect: a call that fails inside **Invoke** can be made twice, so its side effects happen twice and nothing says so. VB6 makes the call once. A failed property assignment is followed by a second **Invoke** with *wFlags* 3. A call with more arguments than a **Sub** takes runs the **Sub**, then fails with error 13, and a late-bound statement does this twice. Code that implements **Invoke** must not change state before it can still fail.
 
 > [!NOTE]
 > **CallByName** repeats a call that returned `DISP_E_MEMBERNOTFOUND`: a second **Invoke** with the same identifier and *wFlags* and a null *pVarResult*, for **VbMethod**, **VbGet** and **VbLet** alike. VB6 does the same. A late-bound statement makes the call once.
diff --git a/docs/Reference/COM-Interfaces/IEnumVARIANT.md b/docs/Reference/COM-Interfaces/IEnumVARIANT.md
index d61836b31..b516b8637 100644
--- a/docs/Reference/COM-Interfaces/IEnumVARIANT.md
+++ b/docs/Reference/COM-Interfaces/IEnumVARIANT.md
@@ -44,7 +44,7 @@ Private Interface IEnumVARIANT Extends stdole.IUnknown
 End Interface
 ```
 
-A class that implements a member marked [**[PreserveSig]**](../../tB/Core/Attributes#preservesig) does not compile (BETA 995), so an implementation cannot return its **HRESULT** as a function result. It sets [**Err.ReturnHResult**](../../tB/Modules/ErrObject/ReturnHResult) instead: `S_FALSE` is 1, `E_NOTIMPL` is `&H80004001`.
+A class that implements a member marked [**[PreserveSig]**](../../tB/Core/Attributes#preservesig) does not compile (BETA 997), so an implementation cannot return its **HRESULT** as a function result. It sets [**Err.ReturnHResult**](../../tB/Modules/ErrObject/ReturnHResult) instead: `S_FALSE` is 1, `E_NOTIMPL` is `&H80004001`.
 
 ## Methods
 
diff --git a/docs/Reference/COM-Interfaces/IErrorInfo.md b/docs/Reference/COM-Interfaces/IErrorInfo.md
index 4f3140423..eaffd5d3e 100644
--- a/docs/Reference/COM-Interfaces/IErrorInfo.md
+++ b/docs/Reference/COM-Interfaces/IErrorInfo.md
@@ -184,7 +184,7 @@ The object that **GetErrorInfo** returns then holds what the method gave **Raise
 **GetErrorInfo** empties the slot as COM requires, so a second read returns `Nothing`.
 
 > [!WARNING]
-> BETA 995 has a defect: the object does not keep the values it was given, and no error tells the caller. It reads them from the **Err** object each time a method is called. [**Err.Clear**](../../tB/Modules/ErrObject/Clear) empties **Err**, so an object read after it returns empty strings and 0, and the next error changes the values to its own. COM requires an **IErrorInfo** to keep what was stored in it. Read the five properties before calling anything else that clears **Err** or raises an error.
+> BETA 997 has a defect: the object does not keep the values it was given, and no error tells the caller. It reads them from the **Err** object each time a method is called. [**Err.Clear**](../../tB/Modules/ErrObject/Clear) empties **Err**, so an object read after it returns empty strings and 0, and the next error changes the values to its own. COM requires an **IErrorInfo** to keep what was stored in it. Read the five properties before calling anything else that clears **Err** or raises an error.
 
 A method that handles an error itself, with [**On Error**](../../tB/Core/On-Error), still leaves the values in **Err** and a returned **IErrorInfo** that shows them, although it returns `S_OK`. A caller reads the slot only after a failure code.
 
@@ -229,7 +229,7 @@ A method can return a failure **HRESULT** without calling **SetErrorInfo**, and
 | `&H8FFF0001` (no meaning) | -1879113727 | `Automation error` |
 
 > [!WARNING]
-> BETA 995 has a defect: the slot is not always empty, and no error tells the caller. A handled error leaves in it an object that reads from **Err**, even when the error was handled in twinBASIC code that never read the slot. VB6 leaves the slot empty. When **Err** has been cleared in between, that object has an empty description, so **Description** of a failure that arrived without information is the standard text of the code: `Unspecified error` for `E_FAIL`, `Invalid procedure call or argument` for `&H800A0005` and `Access is denied.`, in the language of the system, for `E_ACCESSDENIED`. A program that must tell failures apart reads **Number** and does not rely on **Description** for a code that arrived without information.
+> BETA 997 has a defect: the slot is not always empty, and no error tells the caller. A handled error leaves in it an object that reads from **Err**, even when the error was handled in twinBASIC code that never read the slot. VB6 leaves the slot empty. When **Err** has been cleared in between, that object has an empty description, so **Description** of a failure that arrived without information is the standard text of the code: `Unspecified error` for `E_FAIL`, `Invalid procedure call or argument` for `&H800A0005` and `Access is denied.`, in the language of the system, for `E_ACCESSDENIED`. A program that must tell failures apart reads **Number** and does not rely on **Description** for a code that arrived without information.
 
 ### A method that sets error information itself
 
diff --git a/docs/Reference/COM-Interfaces/IUnknown.md b/docs/Reference/COM-Interfaces/IUnknown.md
index 12d843a4a..f5e6e1da1 100644
--- a/docs/Reference/COM-Interfaces/IUnknown.md
+++ b/docs/Reference/COM-Interfaces/IUnknown.md
@@ -131,7 +131,7 @@ A class never needs to implement **IUnknown**: the compiler gives every class an
 `Implements stdole.IUnknown` compiles, and the class works as before. A project's own **Interface** that carries the identifier of **IUnknown** also compiles, and a class can implement it.
 
 > [!WARNING]
-> BETA 995 has a defect: that interface is unusable. **Set** to a variable of that type gives the object's ordinary **IUnknown** pointer, which has none of the interface's methods, and calling one ends the program with an access violation, and any unsaved data is lost. The compiler gives no diagnostic. Do not declare an **Interface** with the identifier of **IUnknown**; use `stdole.IUnknown`.
+> BETA 997 has a defect: that interface is unusable. **Set** to a variable of that type gives the object's ordinary **IUnknown** pointer, which has none of the interface's methods, and calling one ends the program with an access violation, and any unsaved data is lost. The compiler gives no diagnostic. Do not declare an **Interface** with the identifier of **IUnknown**; use `stdole.IUnknown`.
 
 ## Example
 
diff --git a/docs/Reference/Core/Delegate.md b/docs/Reference/Core/Delegate.md
index c13332c10..8d7bf77c4 100644
--- a/docs/Reference/Core/Delegate.md
+++ b/docs/Reference/Core/Delegate.md
@@ -25,7 +25,7 @@ Syntax:
 : The identifier naming the delegate type. Must be a valid twinBASIC identifier.
 
 *callconv*
-: *optional* The calling convention of the procedures the delegate refers to: **CDecl**, **ThisCall** or **FastCall**. The default is stdcall. A C-runtime callback such as the comparator of `qsort` is **CDecl**. See [Calling Conventions](../../Features/Advanced/API-Declarations#calling-conventions), which also describes a defect in BETA 995 that affects calls through **ThisCall** and **FastCall** delegates on 32-bit builds.
+: *optional* The calling convention of the procedures the delegate refers to: **CDecl**, **ThisCall** or **FastCall**. The default is stdcall. A C-runtime callback such as the comparator of `qsort` is **CDecl**. See [Calling Conventions](../../Features/Advanced/API-Declarations#calling-conventions), which also describes a defect in BETA 997 that affects calls through **ThisCall** and **FastCall** delegates on 32-bit builds.
 
 *arglist*
 : *optional* Parameter signature, written exactly as for a [**Sub**](Sub) or [**Function**](Function) --- comma-separated `[ ByVal | ByRef ] [ Optional ] *varname* [ As *type* ]` parts.
diff --git a/docs/Reference/Core/Graphics-Methods.md b/docs/Reference/Core/Graphics-Methods.md
index cc846599e..e0bdb5b4f 100644
--- a/docs/Reference/Core/Graphics-Methods.md
+++ b/docs/Reference/Core/Graphics-Methods.md
@@ -148,7 +148,7 @@ The built-in surfaces read *Color* as a **Long**. When *Color* is left out they
 The line of a **Line** and the fill of **BF** use the same rule, as does the circle of **Circle** and the point of **PSet**.
 
 > [!WARNING]
-> BETA 995 has a defect in system colours. VB6 takes the system colour index from the low 16 bits of the value, so that `&H80010003` draws system colour 3 and `&H80FF000F` draws system colour 15. BETA 995 draws both black, without raising an error, because it reads the value as a system colour only when it lies between `&H80000000` and `&H8000001E`. Pass a system colour as one of the `vb` constants, such as `vbButtonFace`, or as `&H800000nn` with nothing in the second and third bytes.
+> BETA 997 has a defect in system colours. VB6 takes the system colour index from the low 16 bits of the value, so that `&H80010003` draws system colour 3 and `&H80FF000F` draws system colour 15. BETA 997 draws both black, without raising an error, because it reads the value as a system colour only when it lies between `&H80000000` and `&H8000001E`. Pass a system colour as one of the `vb` constants, such as `vbButtonFace`, or as `&H800000nn` with nothing in the second and third bytes.
 
 > [!NOTE]
 > VB6 draws `&H80000019` to `&H8000001E` black, where twinBASIC draws the system colour of that index. The rest of the rule, including the truncation of every other value to 24 bits, is the same.
diff --git a/docs/Reference/Core/LSet.md b/docs/Reference/Core/LSet.md
index 315d011fe..a1653d55a 100644
--- a/docs/Reference/Core/LSet.md
+++ b/docs/Reference/Core/LSet.md
@@ -32,7 +32,7 @@ If *string* is longer than *stringvar*, **LSet** places only the leftmost charac
 **LSet** never changes the length of *stringvar*, so a *stringvar* of zero length stays empty. *stringvar* can be a variable-length string, a fixed-length string, or a **Variant** that holds a string. A *string* that is **Null** raises error 94.
 
 > [!WARNING]
-> BETA 995 has a defect: **LSet** on an element of a **Variant** that holds an array, such as `LSet v(0) = "zz"` with `v = Array("0123456789", "abcde")` or a **Variant** that was given its bounds with **ReDim**, changes nothing and raises no error. VB6 changes the element. An element of an array declared `Dim w(0 To 1) As Variant` works. To change an element of a **Variant** array, copy it to a **String** variable, use **LSet** on the variable and assign the variable back.
+> BETA 997 has a defect: **LSet** on an element of a **Variant** that holds an array, such as `LSet v(0) = "zz"` with `v = Array("0123456789", "abcde")` or a **Variant** that was given its bounds with **ReDim**, changes nothing and raises no error. VB6 changes the element. An element of an array declared `Dim w(0 To 1) As Variant` works. To change an element of a **Variant** array, copy it to a **String** variable, use **LSet** on the variable and assign the variable back.
 
 When copying between user-defined types, **LSet** copies as many bytes as the smaller of the two types holds. If *varname1* is larger than *varname2*, its bytes beyond the end of the source keep their old values. Both types must be free of variable-length **String**, **Variant**, **Object** and dynamic-array fields; the compiler refuses the statement otherwise (error TB5249). Fixed-length **String** fields are allowed.
 
diff --git a/docs/Reference/Core/New.md b/docs/Reference/Core/New.md
index e906170fc..d68b46b67 100644
--- a/docs/Reference/Core/New.md
+++ b/docs/Reference/Core/New.md
@@ -28,7 +28,7 @@ Syntax:
 : A class name or other creatable object type. **New** can't be used to create new instances of any intrinsic data type (such as **Long** or **String**), and can't be used to create dependent objects.
 
 *arglist*
-: *optional* (twinBASIC) The arguments passed to the class's **Sub New** constructor, separated by commas --- `New Dog("Rex")`. The class must declare a **Sub New** whose parameters match; see [Parameterized Class Constructors](../../Features/Advanced/Classes-and-Modules#parameterized-class-constructors). The **As New** form takes no arguments: `Dim d As New Dog("Rex")` is a syntax error. So **As New** needs a class that can be created without arguments: one with a **Sub New** that takes none or whose parameters are all **Optional** (the object is created by calling **Sub New** with the default values), or one with a `Class_Initialize`. For a class whose only **Sub New** has required arguments, **As New** fails with TB5121, *can't use this type with As-New syntax as it doesn't have a parameterless constructor*. In BETA 995, a **Static** variable in a module procedure can take them in an initializer only when the class is declared earlier in the project: `Static d As Dog = New Dog("Rex")` fails with TB5074 when **Dog** is declared later --- in a file that comes later in the project, or lower in the same file. **Dim** with the same initializer, and a **Static** in a class method, compile in either order. So that the code does not depend on file order, declare the **Static** variable, then assign it with **Set**.
+: *optional* (twinBASIC) The arguments passed to the class's **Sub New** constructor, separated by commas --- `New Dog("Rex")`. The class must declare a **Sub New** whose parameters match; see [Parameterized Class Constructors](../../Features/Advanced/Classes-and-Modules#parameterized-class-constructors). The **As New** form takes no arguments: `Dim d As New Dog("Rex")` is a syntax error. So **As New** needs a class that can be created without arguments: one with a **Sub New** that takes none or whose parameters are all **Optional** (the object is created by calling **Sub New** with the default values), or one with a `Class_Initialize`. For a class whose only **Sub New** has required arguments, **As New** fails with TB5121, *can't use this type with As-New syntax as it doesn't have a parameterless constructor*. In BETA 997, a **Static** variable in a module procedure can take them in an initializer only when the class is declared earlier in the project: `Static d As Dog = New Dog("Rex")` fails with TB5074 when **Dog** is declared later --- in a file that comes later in the project, or lower in the same file. **Dim** with the same initializer, and a **Static** in a class method, compile in either order. So that the code does not depend on file order, declare the **Static** variable, then assign it with **Set**.
 
 When **New** is used in a declaration, no instance is created at the point of declaration. Instead, an instance is created automatically the first time the variable is referenced after declaration. Each time the variable is set to **Nothing** and then referenced again, a new instance is created.
 
diff --git a/docs/Reference/Core/RSet.md b/docs/Reference/Core/RSet.md
index a99e10543..37600e012 100644
--- a/docs/Reference/Core/RSet.md
+++ b/docs/Reference/Core/RSet.md
@@ -25,7 +25,7 @@ If *string* is longer than *stringvar*, **RSet** places only the leftmost charac
 **RSet** never changes the length of *stringvar*, so a *stringvar* of zero length stays empty. *stringvar* can be a variable-length string, a fixed-length string, or a **Variant** that holds a string. A *string* that is **Null** raises error 94.
 
 > [!WARNING]
-> BETA 995 has a defect: **RSet** on an element of a **Variant** that holds an array, such as `RSet v(1) = "zz"` with `v = Array("0123456789", "abcde")` or a **Variant** that was given its bounds with **ReDim**, changes nothing and raises no error. VB6 changes the element. An element of an array declared `Dim w(0 To 1) As Variant` works. To change an element of a **Variant** array, copy it to a **String** variable, use **RSet** on the variable and assign the variable back.
+> BETA 997 has a defect: **RSet** on an element of a **Variant** that holds an array, such as `RSet v(1) = "zz"` with `v = Array("0123456789", "abcde")` or a **Variant** that was given its bounds with **ReDim**, changes nothing and raises no error. VB6 changes the element. An element of an array declared `Dim w(0 To 1) As Variant` works. To change an element of a **Variant** array, copy it to a **String** variable, use **RSet** on the variable and assign the variable back.
 
 > [!NOTE]
 > **RSet** can't be used with user-defined types. The compiler refuses the statement.
diff --git a/docs/Reference/Default/VB/CheckBox/index.md b/docs/Reference/Default/VB/CheckBox/index.md
index d0fe4d6da..772da133d 100644
--- a/docs/Reference/Default/VB/CheckBox/index.md
+++ b/docs/Reference/Default/VB/CheckBox/index.md
@@ -81,7 +81,7 @@ Determines how the control's border is drawn by the OS. A member of [**Appearanc
 The background colour, as an **OLE_COLOR**. Defaults to the system 3-D face colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### Caption
 {: .no_toc }
@@ -146,7 +146,7 @@ The **StdFont** used to render [**Caption**](#caption). The convenience properti
 The text colour for the caption, as an **OLE_COLOR**. Defaults to the system button-text colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### Height
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/CheckMark/index.md b/docs/Reference/Default/VB/CheckMark/index.md
index 5b33b55b7..95c2507cc 100644
--- a/docs/Reference/Default/VB/CheckMark/index.md
+++ b/docs/Reference/Default/VB/CheckMark/index.md
@@ -73,7 +73,7 @@ How the glyph is shaded when [**VisualStyles**](#visualstyles) is **False**. A m
 The background colour, as an **OLE_COLOR**. Defaults to the system 3-D face colour. Used only when [**BackStyle**](#backstyle) is **vbBFOpaque**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. Check a colour that comes from user input before assigning it.
 
 ### BackStyle
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/ComboBox/index.md b/docs/Reference/Default/VB/ComboBox/index.md
index 026cd889f..12492f76a 100644
--- a/docs/Reference/Default/VB/ComboBox/index.md
+++ b/docs/Reference/Default/VB/ComboBox/index.md
@@ -76,7 +76,7 @@ Determines how the control's border is drawn by the OS. A member of [**Appearanc
 The colour of the edit area and the list background, as an **OLE_COLOR**. Defaults to the system window-background colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### BorderStyle
 {: .no_toc }
@@ -119,7 +119,7 @@ The **StdFont** used to render text in the edit area and the drop-down list. The
 The text colour, as an **OLE_COLOR**. Defaults to the system window-text colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### Height
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/CommandButton/index.md b/docs/Reference/Default/VB/CommandButton/index.md
index 70054e74e..cf2fe1706 100644
--- a/docs/Reference/Default/VB/CommandButton/index.md
+++ b/docs/Reference/Default/VB/CommandButton/index.md
@@ -66,7 +66,7 @@ Determines how the control's border is drawn by the OS. A member of [**Appearanc
 The background colour, as an **OLE_COLOR**. Defaults to the system 3-D face colour. Honoured only when [**Style**](#style) is **vbButtonGraphical** --- the standard Win32 button always paints with the theme colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### Cancel
 {: .no_toc }
@@ -131,7 +131,7 @@ The **StdFont** used to render [**Caption**](#caption). The convenience properti
 The text colour for the caption, as an **OLE_COLOR**. Defaults to the system button-text colour. Honoured only when [**Style**](#style) is **vbButtonGraphical**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. Check a colour that comes from user input before assigning it.
 
 ### Height
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/Data/index.md b/docs/Reference/Default/VB/Data/index.md
index 63db2d49c..938e251d3 100644
--- a/docs/Reference/Default/VB/Data/index.md
+++ b/docs/Reference/Default/VB/Data/index.md
@@ -81,7 +81,7 @@ Determines how the control's border is drawn by the OS. A member of [**Appearanc
 The fill colour of the band behind the [**Caption**](#caption), as an **OLE_COLOR**. Defaults to the system window-background colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. Check a colour that comes from user input before assigning it.
 
 ### BOFAction
 {: .no_toc }
@@ -166,7 +166,7 @@ The **StdFont** used to render [**Caption**](#caption). The convenience properti
 The text colour for the caption, as an **OLE_COLOR**. Defaults to the system window-text colour. A disabled control draws the caption in the system grey-text colour instead.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. Check a colour that comes from user input before assigning it.
 
 ### Height
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/DirListBox/index.md b/docs/Reference/Default/VB/DirListBox/index.md
index 1f34ee573..dd66f8b9c 100644
--- a/docs/Reference/Default/VB/DirListBox/index.md
+++ b/docs/Reference/Default/VB/DirListBox/index.md
@@ -67,7 +67,7 @@ Determines how the control's border is drawn by the OS. A member of [**Appearanc
 The background colour, as an **OLE_COLOR**. Defaults to the system window-background colour. Used as the fill behind every list item except the selected one (which paints with the system highlight colour).
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### BorderStyle
 {: .no_toc }
@@ -110,7 +110,7 @@ The **StdFont** used to render directory names. The convenience properties **Fon
 The text colour for entries that are not currently selected, as an **OLE_COLOR**. Defaults to the system window-text colour. Disabled entries draw in the system grey-text colour, and selected entries draw in the system highlight-text colour, regardless of this setting.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### Height
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/DriveListBox/index.md b/docs/Reference/Default/VB/DriveListBox/index.md
index 802d91e27..026062e23 100644
--- a/docs/Reference/Default/VB/DriveListBox/index.md
+++ b/docs/Reference/Default/VB/DriveListBox/index.md
@@ -67,7 +67,7 @@ Determines how the control's border is drawn by the OS. A member of [**Appearanc
 The background colour of the drop-down list entries, as an **OLE_COLOR**. Defaults to the system window-background colour. Selected entries paint with the system highlight colour regardless of this setting. Changing this calls [**Refresh**](#refresh) so the new colour takes effect immediately.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### CausesValidation
 {: .no_toc }
@@ -114,7 +114,7 @@ The **StdFont** used to render the drive entries. The convenience properties **F
 The text colour for entries that are not currently selected, as an **OLE_COLOR**. Defaults to the system window-text colour. Disabled entries draw in the system grey-text colour, and selected entries draw in the system highlight-text colour, regardless of this setting. Changing this calls [**Refresh**](#refresh).
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### Height
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/FileListBox/index.md b/docs/Reference/Default/VB/FileListBox/index.md
index 59bb77fd2..c4945b808 100644
--- a/docs/Reference/Default/VB/FileListBox/index.md
+++ b/docs/Reference/Default/VB/FileListBox/index.md
@@ -94,7 +94,7 @@ When **True** (default), files with the archive attribute are included in the li
 The background colour, as an **OLE_COLOR**. Defaults to the system window-background colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### BorderStyle
 {: .no_toc }
@@ -146,7 +146,7 @@ The **StdFont** used to render file names. The convenience properties **FontName
 The text colour for entries that are not currently selected, as an **OLE_COLOR**. Defaults to the system window-text colour. Disabled entries draw in the system grey-text colour, and selected entries draw in the system highlight-text colour, regardless of this setting.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### Height
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/Form/index.md b/docs/Reference/Default/VB/Form/index.md
index 968b50129..908afff38 100644
--- a/docs/Reference/Default/VB/Form/index.md
+++ b/docs/Reference/Default/VB/Form/index.md
@@ -150,7 +150,7 @@ When **False**, drawing primitives --- [**Cls**](#cls), [**Circle**](#circle), [
 The background colour of the form's client area, as an **OLE_COLOR**. Defaults to the system 3-D face colour. Used as the fill colour for [**Cls**](#cls) and as the canvas behind [**Picture**](#picture).
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### BorderStyle
 {: .no_toc }
@@ -244,7 +244,7 @@ Determines whether the form accepts user input. A disabled form ignores keyboard
 The fill colour for closed shapes drawn by [**Circle**](#circle) and the rectangle form of [**Line**](#line) without **F**. **OLE_COLOR**, default `0` (black). Used only when [**FillStyle**](#fillstyle) is not **vbFSTransparent**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so [**Circle**](#circle) and [**Line**](#line) then draw with it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so [**Circle**](#circle) and [**Line**](#line) then draw with it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### FillStyle
 {: .no_toc }
@@ -267,7 +267,7 @@ When **True** (default), text drawn on the form has a transparent background, le
 The pen colour used by [**Circle**](#circle), [**Line**](#line), [**PSet**](#pset), and the text drawn by [**Print**](#print). **OLE_COLOR**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1` or `&H8000001F`, raises error 5 and still stores the value, so a later read returns it and a handled error leaves the invalid colour in force. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1` or `&H8000001F`, raises error 5 and still stores the value, so a later read returns it and a handled error leaves the invalid colour in force. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### hDC
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/Frame/index.md b/docs/Reference/Default/VB/Frame/index.md
index dc398cf20..9c857a3a1 100644
--- a/docs/Reference/Default/VB/Frame/index.md
+++ b/docs/Reference/Default/VB/Frame/index.md
@@ -78,7 +78,7 @@ Determines how the frame's border is drawn by the OS. A member of [**AppearanceC
 The background colour of the frame's client area, as an **OLE_COLOR**. Defaults to the system 3-D face colour. Painted behind contained controls.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### BorderStyle
 {: .no_toc }
@@ -170,7 +170,7 @@ Shortcut for `Font.Underline`. **Boolean**.
 The colour used to draw [**Caption**](#caption), as an **OLE_COLOR**. Defaults to the system button-text colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### Height
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/Label/index.md b/docs/Reference/Default/VB/Label/index.md
index 3660794d6..4419a7dd8 100644
--- a/docs/Reference/Default/VB/Label/index.md
+++ b/docs/Reference/Default/VB/Label/index.md
@@ -127,7 +127,7 @@ Whether the label resizes itself to fit its [**Caption**](#caption), [**Font**](
 The colour painted behind the caption when [**BackStyle**](#backstyle) is **vbBFOpaque**. **OLE_COLOR**, defaults to the system 3-D face colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### BackStyle
 {: .no_toc }
@@ -268,7 +268,7 @@ Shortcut for `Font.Underline`. **Boolean**.
 The text colour for [**Caption**](#caption), as an **OLE_COLOR**. Defaults to the system button-text colour. Replaced with the system grey-text colour when [**Enabled**](#enabled) is **False**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### Height
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/ListBox/index.md b/docs/Reference/Default/VB/ListBox/index.md
index d131fc00e..d3b2b9d0c 100644
--- a/docs/Reference/Default/VB/ListBox/index.md
+++ b/docs/Reference/Default/VB/ListBox/index.md
@@ -109,7 +109,7 @@ Determines how the control's border is drawn by the OS. A member of [**Appearanc
 The background colour of the list area, as an **OLE_COLOR**. Defaults to the system window-background colour. Items drawn in the selected state ignore **BackColor** in favour of the system highlight colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### BorderStyle
 {: .no_toc }
@@ -198,7 +198,7 @@ The **StdFont** used to render item text. The convenience properties **FontName*
 The text colour for entries that are not currently selected, as an **OLE_COLOR**. Defaults to the system window-text colour. Disabled entries draw in the system grey-text colour, and selected entries draw in the system highlight-text colour, regardless of this setting.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### Height
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/MultiFrame/index.md b/docs/Reference/Default/VB/MultiFrame/index.md
index 80df83e52..186690c12 100644
--- a/docs/Reference/Default/VB/MultiFrame/index.md
+++ b/docs/Reference/Default/VB/MultiFrame/index.md
@@ -79,7 +79,7 @@ The set of edges of the parent that the **MultiFrame**'s corresponding edges fol
 The background colour of the **MultiFrame**'s drawing surface, as an **OLE_COLOR**. Defaults to the system window-background colour. Visible only where the contained frames do not fully cover the extent --- e.g. when their **MultiFrameSize**s sum to less than 100%.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. Check a colour that comes from user input before assigning it.
 
 ### Container
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/OLE/index.md b/docs/Reference/Default/VB/OLE/index.md
index 3451faf16..2ec3ae2e2 100644
--- a/docs/Reference/Default/VB/OLE/index.md
+++ b/docs/Reference/Default/VB/OLE/index.md
@@ -108,7 +108,7 @@ When **True** (default), right-clicking the container automatically pops up a me
 The background colour, as an **OLE_COLOR**. Defaults to the system window-background colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### BackStyle
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/OptionButton/index.md b/docs/Reference/Default/VB/OptionButton/index.md
index e3282cfbc..3fb23389e 100644
--- a/docs/Reference/Default/VB/OptionButton/index.md
+++ b/docs/Reference/Default/VB/OptionButton/index.md
@@ -85,7 +85,7 @@ Determines how the control's border is drawn by the OS. A member of [**Appearanc
 The background colour, as an **OLE_COLOR**. Defaults to the system 3-D face colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### Caption
 {: .no_toc }
@@ -150,7 +150,7 @@ The **StdFont** used to render [**Caption**](#caption). The convenience properti
 The text colour for the caption, as an **OLE_COLOR**. Defaults to the system button-text colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### Height
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/PictureBox/index.md b/docs/Reference/Default/VB/PictureBox/index.md
index 98efe767b..db1045013 100644
--- a/docs/Reference/Default/VB/PictureBox/index.md
+++ b/docs/Reference/Default/VB/PictureBox/index.md
@@ -104,7 +104,7 @@ When **True**, the control resizes itself to fit the assigned [**Picture**](#pic
 The background colour of the control's drawing surface, as an **OLE_COLOR**. Defaults to the system 3-D face colour. Assigning a new value invalidates the surface and triggers a repaint.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### BorderStyle
 {: .no_toc }
@@ -207,7 +207,7 @@ Determines whether the control accepts user input. **Boolean**, default **True**
 The colour used to fill closed shapes drawn by [**Line**](#line) with **B** and without **F**, and by [**Circle**](#circle), as an **OLE_COLOR**. Default **0** (black). Honoured only when [**FillStyle**](#fillstyle) is not **vbFSTransparent**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so [**Circle**](#circle) and [**Line**](#line) then draw with it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so [**Circle**](#circle) and [**Line**](#line) then draw with it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### FillStyle
 {: .no_toc }
@@ -260,7 +260,7 @@ Shortcut for [**Font**](#font)`.Underline`. **Boolean**.
 The colour used by the graphics-method pen (lines, circles, points) and by [**Print**](#print) text, as an **OLE_COLOR**. Defaults to the system button-text colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1` or `&H8000001F`, raises error 5 and still stores the value, so a later read returns it and a handled error leaves the invalid colour in force. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1` or `&H8000001F`, raises error 5 and still stores the value, so a later read returns it and a handled error leaves the invalid colour in force. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### HasDC
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/Printer/index.md b/docs/Reference/Default/VB/Printer/index.md
index 12bd24fdf..557cf09cc 100644
--- a/docs/Reference/Default/VB/Printer/index.md
+++ b/docs/Reference/Default/VB/Printer/index.md
@@ -148,7 +148,7 @@ Syntax: *object*.**Duplex** [ = *value* ]
 The colour used to fill closed shapes drawn by [**Line**](#line) with **B** and without **F**, and by [**Circle**](#circle), as an **OLE_COLOR**. Default **0** (black). Honoured only when [**FillStyle**](#fillstyle) is not **vbFSTransparent**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so [**Circle**](#circle) and [**Line**](#line) then draw with it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so [**Circle**](#circle) and [**Line**](#line) then draw with it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### FillStyle
 {: .no_toc }
@@ -218,7 +218,7 @@ Shortcut for [**Font**](#font)`.Underline`. **Boolean**.
 The colour used by the drawing-method pen (lines, circles, points) and by [**Print**](#print) text. **OLE_COLOR**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1` or `&H8000001F`, raises error 5 and still stores the value, so a later read returns it and a handled error leaves the invalid colour in force. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1` or `&H8000001F`, raises error 5 and still stores the value, so a later read returns it and a handled error leaves the invalid colour in force. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### hDC
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/PropertyPage/index.md b/docs/Reference/Default/VB/PropertyPage/index.md
index 90145ab8a..f10515089 100644
--- a/docs/Reference/Default/VB/PropertyPage/index.md
+++ b/docs/Reference/Default/VB/PropertyPage/index.md
@@ -97,7 +97,7 @@ When **False**, drawing primitives --- [**Cls**](#cls), [**Circle**](#circle), [
 The background colour of the page's client area, as an **OLE_COLOR**. Defaults to the system 3-D face colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### Caption
 {: .no_toc }
@@ -183,7 +183,7 @@ The pen width in pixels for drawing primitives. **Long**, default `1`. Widths gr
 The fill colour for closed shapes drawn by [**Circle**](#circle) and the rectangle form of [**Line**](#line) without **F**. **OLE_COLOR**, default `0` (black). Used only when [**FillStyle**](#fillstyle) is not **vbFSTransparent**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so [**Circle**](#circle) and [**Line**](#line) then draw with it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so [**Circle**](#circle) and [**Line**](#line) then draw with it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### FillStyle
 {: .no_toc }
@@ -236,7 +236,7 @@ Shortcut for [**Font**](#font)`.Underline`. **Boolean**.
 The pen colour used by [**Circle**](#circle), [**Line**](#line), [**PSet**](#pset), and the text drawn by [**Print**](#print). **OLE_COLOR**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1` or `&H8000001F`, raises error 5 and still stores the value, so a later read returns it and a handled error leaves the invalid colour in force. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1` or `&H8000001F`, raises error 5 and still stores the value, so a later read returns it and a handled error leaves the invalid colour in force. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### HasDC
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/QRCode/index.md b/docs/Reference/Default/VB/QRCode/index.md
index 76be6e0e6..a48744cd0 100644
--- a/docs/Reference/Default/VB/QRCode/index.md
+++ b/docs/Reference/Default/VB/QRCode/index.md
@@ -195,7 +195,7 @@ Determines whether the control accepts mouse input. A disabled **QRCode** still
 The colour of the dark modules in the generated QR code, as an **OLE_COLOR**. Default **vbBlack**. The light modules are always transparent --- the control's parent shows through them, so place the **QRCode** over a contrasting background.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1` or `&H8000001F`, raises error 5 and still stores the value, so a later read returns it and a handled error leaves the invalid colour in force. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1` or `&H8000001F`, raises error 5 and still stores the value, so a later read returns it and a handled error leaves the invalid colour in force. Check a colour that comes from user input before assigning it.
 
 ### Height
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/Report/index.md b/docs/Reference/Default/VB/Report/index.md
index 421d6c2ca..4d042ac35 100644
--- a/docs/Reference/Default/VB/Report/index.md
+++ b/docs/Reference/Default/VB/Report/index.md
@@ -165,7 +165,7 @@ Whether drawing performed on the report's window persists across invalidations.
 The background colour of the report window's drawing surface, as an **OLE_COLOR**. Defaults to the system 3-D face colour. Most of the window is occupied by the page preview (which uses [**PaperColor**](#papercolor)) and the toolbar, so this colour is only visible briefly during paint.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### BorderStyle
 {: .no_toc }
@@ -256,7 +256,7 @@ Determines whether the report window accepts user input. A disabled report ignor
 The fill colour for closed shapes drawn by [**Circle**](#circle) and the rectangle form of [**Line**](#line) without **F**. **OLE_COLOR**, default `0` (black). Used only when [**FillStyle**](#fillstyle) is not **vbFSTransparent**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so [**Circle**](#circle) and [**Line**](#line) then draw with it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so [**Circle**](#circle) and [**Line**](#line) then draw with it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### FillStyle
 {: .no_toc }
@@ -279,7 +279,7 @@ When **True** (default), text drawn on the report has a transparent background,
 The pen colour used by [**Circle**](#circle), [**Line**](#line), [**PSet**](#pset), and the text drawn by [**Print**](#print). **OLE_COLOR**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1` or `&H8000001F`, raises error 5 and still stores the value, so a later read returns it and a handled error leaves the invalid colour in force. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1` or `&H8000001F`, raises error 5 and still stores the value, so a later read returns it and a handled error leaves the invalid colour in force. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### hDC
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/Shape/index.md b/docs/Reference/Default/VB/Shape/index.md
index 43b6e7e0b..92f654abc 100644
--- a/docs/Reference/Default/VB/Shape/index.md
+++ b/docs/Reference/Default/VB/Shape/index.md
@@ -137,7 +137,7 @@ The rotation of the rendered shape, in degrees, anti-clockwise around the contro
 The colour painted into the **Shape**'s bounding rectangle (outside the shape's own outline) when [**BackStyle**](#backstyle) is **vbBFOpaque**. **OLE_COLOR**, defaults to the system window-background colour. Has no effect when [**BackStyle**](#backstyle) is **vbBFTransparent**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### BackStyle
 {: .no_toc }
@@ -185,7 +185,7 @@ The raster operation that the shape drawing applies when combining its pixels wi
 The primary colour used to fill the shape's interior. **OLE_COLOR**, defaults to the system scrollbar colour. Used as the only colour for solid and hatched fills, and as the start colour for gradient fills. Has no effect when [**FillStyle**](#fillstyle) is **vbFSTransparent**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### FillColorAlt
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/TextBox/index.md b/docs/Reference/Default/VB/TextBox/index.md
index 7f28370a6..db51611db 100644
--- a/docs/Reference/Default/VB/TextBox/index.md
+++ b/docs/Reference/Default/VB/TextBox/index.md
@@ -98,7 +98,7 @@ Determines how the control's border is drawn by the OS. A member of [**Appearanc
 The background colour of the edit area, as an **OLE_COLOR**. Defaults to the system window-background colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### BorderStyle
 {: .no_toc }
@@ -212,7 +212,7 @@ Shortcut for [**Font**](#font)`.Underline`. **Boolean**.
 The text colour, as an **OLE_COLOR**. Defaults to the system window-text colour.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### Height
 {: .no_toc }
@@ -281,7 +281,7 @@ When **True**, the user can scroll, select, and copy text but cannot modify it.
 The maximum number of characters the user can type into the control. **Long**, default `0` --- when zero, the OS imposes its own limit (typically 32 767 characters for single-line, much larger for multi-line). Setting **MaxLength** below the current text length does not truncate what is already there, but blocks further typing until the user deletes enough characters.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning [**Text**](#text) in code is not limited by **MaxLength**. The whole string is stored, and no error is raised. VB6 truncates the string to **MaxLength** characters. Truncate the string in code before assigning it, with **Left$**.
+> BETA 997 has a defect: assigning [**Text**](#text) in code is not limited by **MaxLength**. The whole string is stored, and no error is raised. VB6 truncates the string to **MaxLength** characters. Truncate the string in code before assigning it, with **Left$**.
 
 ### MouseIcon
 {: .no_toc }
diff --git a/docs/Reference/Default/VB/UserControl/index.md b/docs/Reference/Default/VB/UserControl/index.md
index 7c0260058..9b5ac6bbf 100644
--- a/docs/Reference/Default/VB/UserControl/index.md
+++ b/docs/Reference/Default/VB/UserControl/index.md
@@ -143,7 +143,7 @@ When **False**, drawing primitives --- [**Cls**](#cls), [**Circle**](#circle), [
 The background colour of the control's surface, as an **OLE_COLOR**. Defaults to the system 3-D face colour. Has no visible effect when [**BackStyle**](#backstyle) is **vbBFTransparent**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### BackStyle
 {: .no_toc }
@@ -282,7 +282,7 @@ The host's extender wrapper around this **UserControl**, as an **Object**. Read-
 The fill colour for closed shapes drawn by [**Circle**](#circle) and the rectangle form of [**Line**](#line) without **F**. **OLE_COLOR**, default `0` (black). Used only when [**FillStyle**](#fillstyle) is not **vbFSTransparent**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so [**Circle**](#circle) and [**Line**](#line) then draw with it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so [**Circle**](#circle) and [**Line**](#line) then draw with it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### FillStyle
 {: .no_toc }
@@ -340,7 +340,7 @@ Whether the control automatically resizes itself to fill the host's container ar
 The pen colour used by [**Circle**](#circle), [**Line**](#line), [**PSet**](#pset), and the text drawn by [**Print**](#print). **OLE_COLOR**.
 
 > [!WARNING]
-> BETA 995 has a defect: assigning a value that is not a colour, such as `-1` or `&H8000001F`, raises error 5 and still stores the value, so a later read returns it and a handled error leaves the invalid colour in force. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1` or `&H8000001F`, raises error 5 and still stores the value, so a later read returns it and a handled error leaves the invalid colour in force. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### ForwardFocus
 {: .no_toc }
diff --git a/docs/Reference/Default/VBA/ErrObject/Description.md b/docs/Reference/Default/VBA/ErrObject/Description.md
index e282d8b70..5f9dfa9c2 100644
--- a/docs/Reference/Default/VBA/ErrObject/Description.md
+++ b/docs/Reference/Default/VBA/ErrObject/Description.md
@@ -21,7 +21,7 @@ The **Description** setting consists of a short description of the error. Use th
 When generating a user-defined error, assign a short description of the error to the **Description** property. If **Description** isn't filled in and the value of [**Number**](Number) corresponds to a built-in run-time error, the string returned by the [**Error**](../Conversion/Error) function is placed in **Description** when the error is generated.
 
 > [!WARNING]
-> BETA 995 has a defect: for a number that has no built-in message, **Raise** without a *description* leaves **Description** as an empty string, a Windows system message or `Automation error`, depending on the number, and raises no error. VBA and VB6 place `Application-defined or object-defined error` there. [**Raise**](Raise) has the table.
+> BETA 997 has a defect: for a number that has no built-in message, **Raise** without a *description* leaves **Description** as an empty string, a Windows system message or `Automation error`, depending on the number, and raises no error. VBA and VB6 place `Application-defined or object-defined error` there. [**Raise**](Raise) has the table.
 
 ### Example
 
diff --git a/docs/Reference/Default/VBA/ErrObject/Raise.md b/docs/Reference/Default/VBA/ErrObject/Raise.md
index 65bad96d2..f39211f6b 100644
--- a/docs/Reference/Default/VBA/ErrObject/Raise.md
+++ b/docs/Reference/Default/VBA/ErrObject/Raise.md
@@ -42,7 +42,7 @@ A *description* of an empty string gives an empty **Description** for every numb
 When the error is raised in a method of a class and the caller handles it, an empty **Description** reaches the caller as `Application-defined or object-defined error`. The other texts arrive unchanged.
 
 > [!WARNING]
-> BETA 995 has a defect: **Raise** differs from VBA and VB6 in three ways, and none of them raises an error. Without *source*, VBA sets **Source** to the name of the project, and twinBASIC leaves it empty. Without *description*, VBA gives every number that has no built-in message the text `Application-defined or object-defined error`, from 1 up to 65535, and twinBASIC gives an empty string or one of the texts above. And an omitted argument keeps the value left by an earlier error in VBA, and is reset in twinBASIC. A program that relies on **Err.Source** being the project name, or on **Err.Description** being non-empty, has to pass those arguments.
+> BETA 997 has a defect: **Raise** differs from VBA and VB6 in three ways, and none of them raises an error. Without *source*, VBA sets **Source** to the name of the project, and twinBASIC leaves it empty. Without *description*, VBA gives every number that has no built-in message the text `Application-defined or object-defined error`, from 1 up to 65535, and twinBASIC gives an empty string or one of the texts above. And an omitted argument keeps the value left by an earlier error in VBA, and is reset in twinBASIC. A program that relies on **Err.Source** being the project name, or on **Err.Description** being non-empty, has to pass those arguments.
 
 **Raise** is preferred over the [**Error**](../../Core/Error) statement when generating run-time errors, particularly inside class modules: the **Err** object holds richer information than the **Error** statement can supply. With **Raise** the source that generated the error can be specified in the [**Source**](Source) property, online Help for the error can be referenced through [**HelpFile**](HelpFile) and [**HelpContext**](HelpContext), and so on.
 
diff --git a/docs/Reference/Default/VBA/ErrObject/Source.md b/docs/Reference/Default/VBA/ErrObject/Source.md
index 993478ec0..4032d6287 100644
--- a/docs/Reference/Default/VBA/ErrObject/Source.md
+++ b/docs/Reference/Default/VBA/ErrObject/Source.md
@@ -25,7 +25,7 @@ When generating an error from user code, pass the source to [**Raise**](Raise).
 When an error occurs that twinBASIC raises itself, such as a division by zero, **Source** is an empty string too, in a standard module and in a class module alike.
 
 > [!WARNING]
-> BETA 995 has a defect: it does not fill in **Source**, and raises no error. VBA and VB6 fill it in automatically with the name of the project, for an error that the runtime raises and for **Raise** without a source argument. A program that reads **Err.Source** to find where an error came from gets an empty string.
+> BETA 997 has a defect: it does not fill in **Source**, and raises no error. VBA and VB6 fill it in automatically with the name of the project, for an error that the runtime raises and for **Raise** without a source argument. A program that reads **Err.Source** to find where an error came from gets an empty string.
 
 ### Example
 
diff --git a/docs/Reference/Default/VBRUN/ErrorCallstack/index.md b/docs/Reference/Default/VBRUN/ErrorCallstack/index.md
index 2bc48763f..7393e09f5 100644
--- a/docs/Reference/Default/VBRUN/ErrorCallstack/index.md
+++ b/docs/Reference/Default/VBRUN/ErrorCallstack/index.md
@@ -15,7 +15,7 @@ An **ErrorCallstack** object is a snapshot of the chain of procedures that were
 The snapshot is read through the **Callstack** property of an **ErrorContext** object, which is itself accessible from the structured error-handling machinery --- typically inside a `Catch` block or an **On Error** handler.
 
 > [!NOTE]
-> As of BETA 995, twinBASIC code cannot obtain an **ErrorCallstack** object, because it cannot obtain the [**ErrorContext**](../ErrorContext) that returns one. The sample below compiles, but no code can supply its argument.
+> As of BETA 997, twinBASIC code cannot obtain an **ErrorCallstack** object, because it cannot obtain the [**ErrorContext**](../ErrorContext) that returns one. The sample below compiles, but no code can supply its argument.
 
 ```tb check_build
 Sub LogStackTrace(ByVal Stack As ErrorCallstack)
diff --git a/docs/Reference/Default/VBRUN/ErrorContext/index.md b/docs/Reference/Default/VBRUN/ErrorContext/index.md
index c598e9417..2e5bf78ff 100644
--- a/docs/Reference/Default/VBRUN/ErrorContext/index.md
+++ b/docs/Reference/Default/VBRUN/ErrorContext/index.md
@@ -15,7 +15,7 @@ An **ErrorContext** object captures everything the runtime knows about a run-tim
 The error-identity properties (**Number**, **Description**, **Source**, **HelpFile**, **HelpContext**, **LastDLLError**) have the same meaning here as on the **Err** object --- see the [**ErrObject**](../../../Modules/ErrObject) module for a discussion of each. **State** and **Callstack** are unique to **ErrorContext** and reflect the structured error-handling machinery that has no equivalent on the legacy **Err** object.
 
 > [!NOTE]
-> As of BETA 995, twinBASIC code cannot obtain an **ErrorContext** object. The **ErrEx** object that returns one is not available, and neither are the **Try**, **Catch** and **Finally** blocks that several [**State**](#state) values refer to. The **Err** object does not implement this interface. The VBRUN package declares the interface and its members, so code that uses them compiles, but nothing returns an object that implements them.
+> As of BETA 997, twinBASIC code cannot obtain an **ErrorContext** object. The **ErrEx** object that returns one is not available, and neither are the **Try**, **Catch** and **Finally** blocks that several [**State**](#state) values refer to. The **Err** object does not implement this interface. The VBRUN package declares the interface and its members, so code that uses them compiles, but nothing returns an object that implements them.
 
 ## Members
 
diff --git a/docs/Reference/Default/VBRUN/ErrorStackFrame/index.md b/docs/Reference/Default/VBRUN/ErrorStackFrame/index.md
index f01fa14c4..7b80533ae 100644
--- a/docs/Reference/Default/VBRUN/ErrorStackFrame/index.md
+++ b/docs/Reference/Default/VBRUN/ErrorStackFrame/index.md
@@ -13,7 +13,7 @@ has_toc: false
 An **ErrorStackFrame** describes one procedure that was active on the call stack at the moment a run-time error was raised --- the project it belongs to, the module that contains it, and its own name. Frames are produced by iterating an [**ErrorCallstack**](../ErrorCallstack) snapshot, which in turn is reachable from the [**Callstack**](../ErrorContext#callstack) property of an [**ErrorContext**](../ErrorContext). Every property is read-only.
 
 > [!NOTE]
-> As of BETA 995, twinBASIC code cannot obtain an **ErrorStackFrame** object, because it cannot obtain the [**ErrorContext**](../ErrorContext) that leads to one. The sample below compiles, but no code can supply its argument.
+> As of BETA 997, twinBASIC code cannot obtain an **ErrorStackFrame** object, because it cannot obtain the [**ErrorContext**](../ErrorContext) that leads to one. The sample below compiles, but no code can supply its argument.
 
 ```tb check_build
 Sub LogStackTrace(ByVal Stack As ErrorCallstack)

From e164b738fbb31d993c7ca59cfcb89fd25c6037b0 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 19:26:31 +0200
Subject: [PATCH 13/42] help lane: the late-bound member list is read once it
 has stopped changing

---
 test/addin/help.test.mjs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/test/addin/help.test.mjs b/test/addin/help.test.mjs
index ebab7ae77..359730356 100644
--- a/test/addin/help.test.mjs
+++ b/test/addin/help.test.mjs
@@ -402,9 +402,14 @@ scenario("the help add-in: F1 and the help pane", (lane) => {
     await at(c, 17, 12);
     const was = await frameSrc(c);
     await pressKey(c, "F1");
+    // A list read as soon as it had items once held 3 of the 12, so wait until
+    // it has stopped changing for a second.
+    let list = "";
+    let since = 0;
     const items = await waitFor(c, async (c) => {
       const r = await results(c);
-      return r.length > 0 && r;
+      if (JSON.stringify(r) !== list) [list, since] = [JSON.stringify(r), Date.now()];
+      return r.length > 0 && Date.now() - since >= 1000 && r;
     });
     assert.equal(items?.length, 12, JSON.stringify(items));
     assert.ok(items.includes("Collection.Addmethod") && items.includes("ToolWindows.Addmethod"), JSON.stringify(items));

From 3dbd52b5906aaa9c98acb10849c23cc3a4506561 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 19:41:17 +0200
Subject: [PATCH 14/42] Four lane-checked defect callouts name BETA 997
 (package import unticked, F8 and Stop at an error, add-in Ctrl/Alt shortcuts)

---
 .../Packages/Importing a package from a TWINPACK file.md      | 2 +-
 docs/Features/Packages/Updating a package.md                  | 2 +-
 docs/IDE/Menu/Debug.md                                        | 2 +-
 docs/Reference/Built-In/tbIDE/KeyboardShortcuts.md            | 4 ++--
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/docs/Features/Packages/Importing a package from a TWINPACK file.md b/docs/Features/Packages/Importing a package from a TWINPACK file.md
index 168eff20a..f8eabcc49 100644
--- a/docs/Features/Packages/Importing a package from a TWINPACK file.md	
+++ b/docs/Features/Packages/Importing a package from a TWINPACK file.md	
@@ -20,7 +20,7 @@ To import a package directly from a TWINPACK file (instead of using TWINSERV), f
 ![Numbered callouts on the Project Settings icon, the Library References section and the Available Packages tab](Images/d9f1e4d9-1805-47e5-93aa-251151b4e914.png)
 - press the **Import from file...** button:
 ![A callout marking the Import from file button below the Available Packages list](Images/e35d5955-9e70-4d6e-abd7-748558da75ba.png)
-- choose the TWINPACK file you want to import. The package is added to the **Available Packages** list, but BETA 995 does not tick it: tick it yourself. It then appears, ticked, on the **Enabled Libraries** tab:
+- choose the TWINPACK file you want to import. The package is added to the **Available Packages** list, but BETA 997 does not tick it: tick it yourself. It then appears, ticked, on the **Enabled Libraries** tab:
 ![The Enabled Libraries list with the imported CSharpishStringFormater and FilePropertyExplorer packages ticked](Images/4e4b8e4d-2a1c-42e5-8f4b-5a9b3f523ee8.png)
 - press **Apply Changes**
 
diff --git a/docs/Features/Packages/Updating a package.md b/docs/Features/Packages/Updating a package.md
index 6c529cb0b..0fed07419 100644
--- a/docs/Features/Packages/Updating a package.md	
+++ b/docs/Features/Packages/Updating a package.md	
@@ -65,7 +65,7 @@ So the old copy has to be removed first:
 
 1. Open [Project Settings](../../tB/IDE/Project/Settings#library-references). Under **Library References**, on the **Enabled Libraries** tab, untick the package, and press **Apply Changes**. The IDE saves the project and restarts the compiler.
 2. Open Project Settings again. On the **Available Packages** tab, press **Import from file...** and choose the new `.twinpack` file.
-3. Tick the package in the **Available Packages** list. BETA 995 adds the imported package to the list but does not tick it.
+3. Tick the package in the **Available Packages** list. BETA 997 adds the imported package to the list but does not tick it.
 4. Press **Apply Changes** again. The project now uses the new build.
 
 > [!WARNING]
diff --git a/docs/IDE/Menu/Debug.md b/docs/IDE/Menu/Debug.md
index 85a22994c..7c16c0928 100644
--- a/docs/IDE/Menu/Debug.md
+++ b/docs/IDE/Menu/Debug.md
@@ -98,7 +98,7 @@ To run on to the end instead, correct the value and press <kbd>F5</kbd>, or pres
 - **A step key leaves a step waiting.** After <kbd>F8</kbd> on the failing line, **Ignore (Resume Next)** stops again on the next line instead of going on. Press <kbd>F5</kbd> to go on.
 - **At an error, Stop ends only the procedure that failed.** The procedure that called it goes on from its next line: if `Sub Main` called `FillTable`, the rest of `Sub Main` still runs. The panel's **Stop**, the toolbar's **Stop** and **Run → End** all do this. At a failed **Assert** check, **Stop** ends only the check, and the test goes on past it as if the check had passed. To end the whole run, first move the arrow to a later line with <kbd>CTRL</kbd> + <kbd>F9</kbd>, then press **Stop**. Away from an error --- at a breakpoint, after a step, or after Set Next Statement --- **Stop** ends the run.
 
-The last two are defects, as of BETA 995.
+The last two are defects, as of BETA 997.
 
 ## Debugger Options
 
diff --git a/docs/Reference/Built-In/tbIDE/KeyboardShortcuts.md b/docs/Reference/Built-In/tbIDE/KeyboardShortcuts.md
index e7cb4edef..c220656eb 100644
--- a/docs/Reference/Built-In/tbIDE/KeyboardShortcuts.md
+++ b/docs/Reference/Built-In/tbIDE/KeyboardShortcuts.md
@@ -30,7 +30,7 @@ End Sub
 The shortcut fires when the key is released, wherever the focus is in the IDE's window --- in the code editor, in the DEBUG CONSOLE, or on nothing at all --- except while a dialog or the rename box is open. If the IDE has a command of its own on the same key, that command runs as well: F1, for one, also expands or collapses the signature help while it is showing. Shift+F12 has no command in the IDE's default keymap.
 
 > [!NOTE]
-> In BETA 995, a shortcut that includes `{CTRL}` or `{ALT}` does not fire when the user presses it. The IDE matches an add-in's shortcut when the key is released, against a press of the same key less than half a second earlier, and it does not record a key pressed while Ctrl or Alt is held down. Such a shortcut fires only if the same key was also pressed on its own within that half second. Use a function key, alone or with `{SHIFT}`.
+> In BETA 997, a shortcut that includes `{CTRL}` or `{ALT}` does not fire when the user presses it. The IDE matches an add-in's shortcut when the key is released, against a press of the same key less than half a second earlier, and it does not record a key pressed while Ctrl or Alt is held down. Such a shortcut fires only if the same key was also pressed on its own within that half second. Use a function key, alone or with `{SHIFT}`.
 
 ## Methods
 
@@ -44,7 +44,7 @@ Syntax: *keyboardShortcuts*.**Add** *keyString*, *Callback*
 *keyString*
 : *required* A **String** naming the key, after any of the prefixes `{CTRL}`, `{SHIFT}` and `{ALT}`. The prefixes must come in that order: the IDE builds the string it compares in that order, so `"{SHIFT}{CTRL}d"` never matches. **Add** converts the string to lower case and removes its spaces, so `"{SHIFT}F12"` and `"{shift} f12"` are the same shortcut. A letter names the key that types it on a US keyboard, whatever the active layout. Any other key is named as the browser names it --- `f1`, `enter`, `escape` --- and a key pressed with Shift by the character it types, so Shift+1 is `"{SHIFT}!"` on a US layout.
 
-  | Example            | Combination       | Fires in BETA 995 |
+  | Example            | Combination       | Fires in BETA 997 |
   |--------------------|-------------------|-------------------|
   | `"f1"`             | F1                | yes               |
   | `"{SHIFT}F12"`     | Shift + F12       | yes               |

From 4c809d735ce042c5be253538899b11c6a36a2882 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 20:30:14 +0200
Subject: [PATCH 15/42] tbbuild reads the project container before it starts an
 IDE, and exits 2 at once on a file that is empty, cut short or not a project,
 which used to come out clean after the timeout behind a message box nobody
 could see; impexp exports readProject, tb-project has checkProject; two
 check_cli cases, which can now write a file into their folder; WIP.md,
 WIP.Harness.md and Tools.md say so

---
 WIP.Harness.md              | 19 +++++++++++++++++--
 WIP.md                      |  2 +-
 docs/Documentation/Tools.md |  4 ++--
 scripts/check_cli.mjs       | 21 ++++++++++++---------
 scripts/impexp.mjs          |  7 +++++--
 scripts/lib/cli-cases.mjs   |  8 +++++++-
 scripts/lib/tb-build.mjs    |  6 +++++-
 scripts/lib/tb-project.mjs  | 21 ++++++++++++++++++++-
 scripts/tbbuild.mjs         | 21 +++++++++++++++++----
 9 files changed, 86 insertions(+), 23 deletions(-)

diff --git a/WIP.Harness.md b/WIP.Harness.md
index 78319254c..59b81da0e 100644
--- a/WIP.Harness.md
+++ b/WIP.Harness.md
@@ -246,8 +246,23 @@ override that, and one of the two is needed for an install kept anywhere else. *
 path is hardcoded**, here or anywhere in the tooling: an install path contains a username.
 
 `--json` gives the same thing as one object and `--keep` leaves the IDE running. Exit codes
-are 0 clean, 1 the project has errors, 2 the harness failed, 3 the compile never settled, 4
-the project crashes the compiler.
+are 0 clean, 1 the project has errors, 2 the harness failed or the project file cannot be read,
+3 the compile never settled, 4 the project crashes the compiler.
+
+**A project file the IDE cannot read is refused before an IDE starts.** `tbbuild` reads the
+container with impexp's reader (`checkProject`, in
+[scripts/lib/tb-project.mjs](scripts/lib/tb-project.mjs)) and exits 2 within a moment,
+naming the file and the fault. Without that, BETA 995 gave exit 0, a clean compile with no
+rows, after the whole `--timeout` (66 s at `--timeout 60`) for an empty file, a file cut off
+halfway and a file with its first byte changed, and exit 3 for a text file. The IDE answers
+such a file with a message box, which nobody can see or answer on the private desktop. The
+status bar never settles, and a wait that ends at its deadline is read as a compile with no
+diagnostics, because `waitForCompile` does not report that it ran out of time. Only the
+container is checked: a file that reads as a project and that the IDE still cannot load is
+not covered. `launchOnDesktop`'s `dialogs: "close"` can record a box, but only by pressing OK
+on it, `launchIde` does not ask for it, and the job it matches boxes against is absent under
+`--keep`. Making `waitForCompile` say that it ran out of time would cover every such wedge,
+and is not done.
 
 **`--show` / `--hide`, and `TBBUILD_SHOW` for a whole session.** Hidden is the default. Its
 cost shows only when something goes wrong: a wedged IDE on a private desktop is invisible to
diff --git a/WIP.md b/WIP.md
index 3c769eccf..e5cf41970 100644
--- a/WIP.md
+++ b/WIP.md
@@ -117,7 +117,7 @@ node scripts/tbrun.mjs <exported-source-dir>         # what does it print
 ```
 
 - **Pack and unpack projects with `impexp`, never with the compiler executable's `import` or `export` verbs.** The tooling does both in process, through `packTree` and `unpackProject` in `scripts/lib/tb-project.mjs`; by hand it is `node scripts/impexp.mjs`. The compiler's `import` refuses a project that embeds a package (exit 999, twinbasic/twinbasic#841), and both verbs exit 0 after the failures they report. The reasons, and the path and stdin rules for anything that does run the executable (`bug_repro`'s `cli` mode), are in [WIP.Harness.md](WIP.Harness.md#getting-at-the-twin-sources).
-- **`tbbuild` exit codes:** 0 clean, 1 the project has errors, 2 the harness failed, 3 the compile never settled, 4 the project crashes the compiler, 5 the build failed after a clean compile. `--json` returns one object, `--keep` leaves the IDE running. **`--build` and `--llvm` (which implies it) build the project after a clean compile**, because LLVM code generation runs in a build and a compile never asks for it. They first stage a copy with an explicit build path (`%TEMP%\tbbuild\<port>\`), so the given `.twinproj` is untouched. A plain `--build` is the control for an `--llvm` run. `--llvm` refuses a Community or Personal licence.
+- **`tbbuild` exit codes:** 0 clean, 1 the project has errors, 2 the harness failed or the project file cannot be read (empty, cut short, not a project: it is read before an IDE starts), 3 the compile never settled, 4 the project crashes the compiler, 5 the build failed after a clean compile. `--json` returns one object, `--keep` leaves the IDE running. **`--build` and `--llvm` (which implies it) build the project after a clean compile**, because LLVM code generation runs in a build and a compile never asks for it. They first stage a copy with an explicit build path (`%TEMP%\tbbuild\<port>\`), so the given `.twinproj` is untouched. A plain `--build` is the control for an `--llvm` run. `--llvm` refuses a Community or Personal licence.
 - **It runs the IDE on a private Windows desktop**, so it cannot seize focus. Set `TBBUILD_SHOW=1` while working interactively and leave it unset for unattended runs: a wedged IDE nobody can see is expensive to diagnose.
 - **One project per IDE**, 6--8 seconds each and flat in project size. Reusing a live IDE for a second project wedges it, so the cold start is the unit of work, not overhead to optimise away. Run concurrently to go faster: distinct `--port` values give distinct DevTools ports, user-data folders, temp folders (`%TEMP%\tbbuild-tmp-<port>`; IDEs building in one temp folder fail now and then to write the type library) and desktops.
 - **Keep a probe that might crash the compiler in a project of its own.** twinBASIC runs the compiler in the same process as user code, so one bad probe can take the run down and cost the other probes their answer.
diff --git a/docs/Documentation/Tools.md b/docs/Documentation/Tools.md
index 9022e5755..1ca7c2b0d 100644
--- a/docs/Documentation/Tools.md
+++ b/docs/Documentation/Tools.md
@@ -695,7 +695,7 @@ Verifies `lib/cli.mjs`, the module the tools read their command lines through, a
 
 The module's probes cover what `parseCli` returns and refuses, with a comparison against a strict `node:util` `parseArgs` over the same argument lists, and what `numberOption`, `choiceOption`, `regexOption`, `urlOption`, `dateOption`, `refuseTogether`, `withUsageError` and `printHelpAndExit` do. The first five are how a tool reads a value after the parse, and `refuseTogether` refuses options that exclude each other. The parse is strict for every tool: `parseCli` refuses an unknown option, a boolean flag given a value, a value flag with no value, a positional beyond the count the tool declares, and an empty value unless the option allows one --- only `tbdocs`'s `--baseurl` does. The probes cover each refusal and the `--` that ends the options. They also cover the options `builder/command-line.mjs` returns for `tbdocs`, where `--no-check` makes the order of the flags matter; no case can, since each of those command lines starts a build.
 
-The recorded cases are invocations that stop while the tool reads its command line, or at its first check of the project, folder, file or install the command line names, each with its exit code and what it prints on each stream: the tool's own words for the error exactly, a crash's only by the line that names the problem, and the opening of a usage text printed after it. Each case runs the tool as a child process, in an empty folder of its own and with `TB_IDE` and `PUPPETEER_EXECUTABLE_PATH` naming files that do not exist, so a case that gets past the command line fails on a different message rather than starting a twinBASIC IDE or a browser. A case belongs here only if the tool stops before doing any work.
+The recorded cases are invocations that stop while the tool reads its command line, or at its first check of the project, folder, file or install the command line names, each with its exit code and what it prints on each stream: the tool's own words for the error exactly, a crash's only by the line that names the problem, and the opening of a usage text printed after it. Each case runs the tool as a child process, in an empty folder of its own (or one holding just the file the case writes there) and with `TB_IDE` and `PUPPETEER_EXECUTABLE_PATH` naming files that do not exist, so a case that gets past the command line fails on a different message rather than starting a twinBASIC IDE or a browser. A case belongs here only if the tool stops before doing any work.
 
 Exit codes: **0** every probe and recorded case passed, **1** a probe or a recorded case failed, **2** the gate could not run: a refused command line, or a crash.
 
@@ -889,7 +889,7 @@ twinBASIC has no command-line build. The compiler executable's whole surface is
 
 Seven files under `scripts/lib/` belong to it and are never run directly. `tb-build.mjs` is `tbbuild` without its command line: `compileProject` opens a project in the IDE and returns its diagnostics as an array, which is how `check_examples.mjs` and `sweep_attributes.mjs` build many projects without starting a process for each. It never exits the process and never tidies the registry, so its caller owns both. `tb-ide.mjs` holds the mechanics `tb-build.mjs` and `tbrun.mjs` share: starting the IDE, attaching to it, waiting for the compile, and reading the diagnostics. `tb-ide-console.mjs` reads the IDE's DEBUG CONSOLE, which is where `tbrun` finds what a probe printed. `tb-run.mjs` presses Build and reads that console until a `[RunAfterBuild]` Sub has finished, and checks what was erased for a failed build; `tbrun` and `check_examples.mjs`'s `check_run` capture a run with it, so they capture it the same way. `tb-registry.mjs` records and restores the registry entries described above, through .NET's registry API by way of PowerShell, because `reg.exe` mangles any path holding a character outside the console code page; [`check_tb_registry.mjs`](#check-tb-registry) is its self-test. `tb-cdp.mjs` is a minimal CDP client over Node's global `WebSocket`, raw rather than puppeteer because a pending `alert()` blocks the renderer and puppeteer's `connect()` handshake talks to the renderer --- so it hangs on precisely the state you need to recover from. Every call it makes has a time limit, so a blocked page ends a run with a message rather than holding it forever. `tb-launch.ps1` holds the Win32 calls Node cannot make without a native FFI addon: `CreateDesktop` and `CreateProcess` with `STARTUPINFO.lpDesktop` for the private desktop, and the job object described above. It is the only PowerShell file under `scripts/`, and it is not executed as a file: `tb-ide.mjs` reads the text and passes it through `-EncodedCommand`, so the execution policy never comes into it and nobody has to be told to bypass one.
 
-Exit codes: **0** the project compiled without errors; **1** the project has errors; **2** a refused command line (a path that is not a `.twinproj` included), no IDE, an IDE that did not start or expose a debug port, a project that could not be exported or packed, an `--llvm` run on a Community or Personal licence, or a crash; **3** the compile never settled: the IDE did not report the project open, or its diagnostics did not match its status bar; **4** the project crashes the compiler; **5** the build failed after a clean compile.
+Exit codes: **0** the project compiled without errors; **1** the project has errors; **2** a refused command line (a path that is not a `.twinproj` included), a project file that cannot be read (empty, cut short or not a project at all: it is read before an IDE starts, and the message names the file and what is wrong), no IDE, an IDE that did not start or expose a debug port, a project that could not be exported or packed, an `--llvm` run on a Community or Personal licence, or a crash; **3** the compile never settled: the IDE did not report the project open, or its diagnostics did not match its status bar; **4** the project crashes the compiler; **5** the build failed after a clean compile.
 
 ### tbrun.mjs
 {: #tbrun }
diff --git a/scripts/check_cli.mjs b/scripts/check_cli.mjs
index d51221617..6d2161460 100644
--- a/scripts/check_cli.mjs
+++ b/scripts/check_cli.mjs
@@ -24,17 +24,18 @@
 // so each has a case for both, and after each of them the folder it ran in must
 // still be empty: a help request starts no IDE or browser and writes nothing.
 //
-// Only invocations that stop while reading the command line belong here. Each
-// runs as a child process, all of them at once, each with a time limit, in an
-// empty folder of its own and with TB_IDE, PUPPETEER_EXECUTABLE_PATH and VB6_EXE
-// naming files that do not exist. So a case that gets past the command line fails
-// on a message of a different kind rather than starting a twinBASIC IDE, a
-// browser or VB6, and a default path relative to the working folder, such as
-// tbdocs's `docs`, finds nothing. No tree, no browser, no install; about a
-// second.
+// Only invocations that stop while reading the command line, or at the first
+// check of a file it names, belong here. Each runs as a child process, all of
+// them at once, each with a time limit, in an empty folder of its own and with
+// TB_IDE, PUPPETEER_EXECUTABLE_PATH and VB6_EXE naming files that do not exist.
+// So a case that gets past the command line fails on a message of a different
+// kind rather than starting a twinBASIC IDE, a browser or VB6, and a default
+// path relative to the working folder, such as tbdocs's `docs`, finds nothing.
+// A case that names a file it needs lists it in `files`, name and content, and
+// the folder holds just that. No tree, no browser, no install; about a second.
 
 import { execFile } from "node:child_process";
-import { mkdir, mkdtemp, readdir, rm } from "node:fs/promises";
+import { mkdir, mkdtemp, readdir, rm, writeFile } from "node:fs/promises";
 import { availableParallelism, tmpdir } from "node:os";
 import path from "node:path";
 import { pathToFileURL } from "node:url";
@@ -765,6 +766,8 @@ try {
       const i = next++;
       const cwd = path.join(scratch, `case-${i}`);
       await mkdir(cwd);
+      for (const [name, content] of Object.entries(CASES[i].files ?? {}))
+        await writeFile(path.join(cwd, name), content);
       results[i] = await runCase(CASES[i], cwd, env);
       if (asksForHelp(CASES[i]) || LEAVES_EMPTY.has(CASES[i])) results[i].left = await readdir(cwd);
     }
diff --git a/scripts/impexp.mjs b/scripts/impexp.mjs
index 45353c594..5ab737ad7 100644
--- a/scripts/impexp.mjs
+++ b/scripts/impexp.mjs
@@ -26,7 +26,10 @@
 // the two verbs do, with the same arguments and { overwrite }. Each returns
 // what the command line prints -- the counts, the skipped and added entries,
 // the warnings -- and throws where it reports an error: a Refusal, whose
-// reason names its exit code, has written nothing.
+// reason names its exit code, has written nothing. readProject(file) reads a
+// project file into its tree and writes nothing; it throws the Refusal the
+// verbs report for a file that is missing, is a folder, or is damaged or is
+// not a project at all.
 
 import fs from "node:fs";
 import path from "node:path";
@@ -307,7 +310,7 @@ function listed(paths) {
   return shown;
 }
 
-function readProject(file) {
+export function readProject(file) {
   let data;
   try {
     data = fs.readFileSync(file);
diff --git a/scripts/lib/cli-cases.mjs b/scripts/lib/cli-cases.mjs
index d7e6af3ff..6baa27b0f 100644
--- a/scripts/lib/cli-cases.mjs
+++ b/scripts/lib/cli-cases.mjs
@@ -1,7 +1,8 @@
 // The recorded cases scripts/check_cli.mjs runs: invocations that stop while
 // a tool reads its command line, each with the exit code and the text printed
 // on each stream. check_cli.mjs's opening comment says what a case asserts and
-// which invocations belong here; this module only builds the list.
+// which invocations belong here; this module only builds the list. A case that
+// needs a file in its folder lists it in `files`, as `{ name: content }`.
 //
 // CASES is the hand-written table, then the cases generated from HELP_TOOLS
 // (--help and -h for every tool), REFUSALS (an unknown flag and an empty value
@@ -96,6 +97,11 @@ const CASES = [
   { tool: "scripts/tbbuild.mjs", args: ["x.twinproj", "--port", "0", "--help"], exit: 0, stdout: /^usage: node scripts\/tbbuild\.mjs / },
   { tool: "scripts/tbbuild.mjs", args: ["--bogus", "--keep", "x.twinproj"], exit: 2, stderr: /^unknown option: --bogus\nusage: node scripts\/tbbuild\.mjs / },
   { tool: "scripts/tbbuild.mjs", args: ["--keep", "x.twinproj"], exit: 2, stderr: "no such project: x.twinproj\n" },
+  // A project file that exists and cannot be read is refused from its container, before any IDE is
+  // looked for: the IDE would open a message box nobody can answer on its private desktop, and the run
+  // would end at the timeout reading as clean. `files` is written into the case's folder first.
+  { tool: "scripts/tbbuild.mjs", args: ["empty.twinproj"], files: { "empty.twinproj": "" }, exit: 2, stderr: "empty.twinproj is damaged or is not a project file: the file ends too soon\n" },
+  { tool: "scripts/tbbuild.mjs", args: ["garbage.twinproj"], files: { "garbage.twinproj": "garbage" }, exit: 2, stderr: "garbage.twinproj is damaged or is not a project file: Bad magic: 0x62726167, expected 0xEA0BA51C\n" },
   { tool: "scripts/tbrun.mjs", args: [], exit: 2, stderr: /^usage: node scripts\/tbrun\.mjs / },
   { tool: "scripts/tbrun.mjs", args: ["no-such-dir", "--help"], exit: 0, stdout: /^usage: node scripts\/tbrun\.mjs / },
   { tool: "scripts/tbrun.mjs", args: ["no-such-dir", "--arch", "win99"], exit: 2, stderr: /^--arch expects win32 or win64, got: win99\nusage: node scripts\/tbrun\.mjs / },
diff --git a/scripts/lib/tb-build.mjs b/scripts/lib/tb-build.mjs
index a8bfc3874..7c763c6f9 100644
--- a/scripts/lib/tb-build.mjs
+++ b/scripts/lib/tb-build.mjs
@@ -17,7 +17,11 @@
 //     do it in the middle of the other lanes' builds.
 //   * It does not check that the project or the IDE exists. The command line
 //     refuses those with a usage error; a caller with a bad path gets code 3
-//     after the timeout, exactly as tbbuild does.
+//     after the timeout, exactly as tbbuild does. Nor does it read the project
+//     file: the command line does, with checkProject (lib/tb-project.mjs), and a
+//     caller that passes a file the IDE cannot read gets the deadline's answer,
+//     which can be a clean compile with no rows. Every caller here packs its own
+//     projects, which are always readable.
 //
 // It always ends its IDE before it returns, unless `keep` is set. Node holds the
 // IDE's launcher in a job of its own (launchIde), so an IDE also goes when the
diff --git a/scripts/lib/tb-project.mjs b/scripts/lib/tb-project.mjs
index 7703bfe2d..97a211c9e 100644
--- a/scripts/lib/tb-project.mjs
+++ b/scripts/lib/tb-project.mjs
@@ -24,11 +24,30 @@
 
 import { cpSync, readFileSync, rmSync, writeFileSync } from "node:fs";
 import path from "node:path";
-import { exportProject, importProject } from "../impexp.mjs";
+import { exportProject, importProject, readProject } from "../impexp.mjs";
 
 // What impexp refused, with its details, for an error message.
 const why = (e) => [e.message, ...(e.details ?? [])].join("\n");
 
+/**
+ * Read a project file's container and say what is wrong with it. Writes nothing.
+ *
+ * A project file the IDE cannot read -- empty, cut short, or not a project at
+ * all -- does not make it fail. The IDE answers with a message box, which nobody
+ * can see or answer on the private desktop the harness runs it on, and the run
+ * goes on to its deadline, where it can read as clean. So the file is read first,
+ * with the reader impexp unpacks a project with, before an IDE is started on it.
+ *
+ * @throws {Error} naming the file and what is wrong
+ */
+export function checkProject(project) {
+  try {
+    readProject(project);
+  } catch (e) {
+    throw new Error(why(e));
+  }
+}
+
 /**
  * Pack a source tree into a project file, replacing the file.
  *
diff --git a/scripts/tbbuild.mjs b/scripts/tbbuild.mjs
index 033f14c15..8cc66f7b5 100644
--- a/scripts/tbbuild.mjs
+++ b/scripts/tbbuild.mjs
@@ -33,8 +33,9 @@
 //                         export that for a session you are watching.
 //
 // Exit codes: 0 clean, 1 the project has errors, 2 the harness could not run (a
-// refused command line included) or crashed, 3 the compile never settled,
-// 4 the project crashes the compiler, 5 the build failed after a clean compile.
+// refused command line, or a project file that cannot be read, included) or
+// crashed, 3 the compile never settled, 4 the project crashes the compiler,
+// 5 the build failed after a clean compile.
 //
 // ---------------------------------------------------------------- why this
 //
@@ -79,7 +80,7 @@ import {
 import { findIde } from "./lib/tb-install.mjs";
 import { compileProject } from "./lib/tb-build.mjs";
 import { COMPILE_TIMEOUT, keptIdeLines, TARGETS, summaryLine, wantShow } from "./lib/tb-ide.mjs";
-import { laneProjectId, stageProject, unpackProject } from "./lib/tb-project.mjs";
+import { checkProject, laneProjectId, stageProject, unpackProject } from "./lib/tb-project.mjs";
 import { finishTidy, startTidy } from "./lib/tb-registry.mjs";
 
 exitOnCrash();
@@ -111,7 +112,8 @@ With --build or --llvm it then builds the project.
 Exit codes:
   0  the project compiled without errors
   1  the project has errors
-  2  a refused command line (a path that is not a .twinproj included), no IDE, an IDE
+  2  a refused command line (a path that is not a .twinproj included), a project file
+     that cannot be read (empty, cut short or not a project at all), no IDE, an IDE
      that did not start or expose a debug port, a project that could not be exported
      or packed, an --llvm run on a Community or Personal licence, or a crash
   3  the compile never settled: the IDE did not report the project open, or its
@@ -200,6 +202,17 @@ if (proj && !existsSync(proj)) {
   console.error(`no such project: ${proj}`);
   process.exit(2);
 }
+// A file that exists and is not a project is refused here too, from its
+// container. The IDE does not fail on one: it opens a message box that nobody can
+// see or answer on a private desktop, and the run goes on to the timeout, where
+// it comes out clean -- or never settled, when the IDE never reports the project
+// open. Reading the container first makes it an exit 2 in a moment, naming the
+// file and what is wrong with it.
+try {
+  checkProject(proj);
+} catch (e) {
+  die(2, e.message);
+}
 // A named IDE that is not there is refused here, naming the path, as tbrun and
 // addin_test refuse it, rather than left for the launch to fail on.
 if (!IDE || !existsSync(IDE)) {

From 119b9a4c9e428cd80f6e5f84b9f781ad847d487d Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 20:48:04 +0200
Subject: [PATCH 16/42] BUGS: two calling conventions accepted, raiseEvent
 TypeError, on* property ignored; pages name BETA 997

---
 BUGS-TO-REPORT.md                             | 130 ++++++++++++++++++
 .../on-property-ignored.twinproj              | Bin 0 -> 3426 bytes
 bugs/on-property-ignored/repro.json           |   4 +
 bugs/on-property-ignored/src/Settings         |  46 +++++++
 .../src/Sources/Startup.twin                  |  47 +++++++
 .../raiseevent-plain-html-typeerror.twinproj  | Bin 0 -> 3495 bytes
 .../repro.json                                |   4 +
 .../src/Settings                              |  46 +++++++
 .../src/Sources/Startup.twin                  |  46 +++++++
 .../repro.json                                |  12 ++
 .../src/Settings                              |  61 ++++++++
 .../src/Sources/Startup.twin                  |  35 +++++
 .../two-calling-conventions-accepted.twinproj | Bin 0 -> 3989 bytes
 docs/Features/Advanced/API-Declarations.md    |   2 +-
 docs/Reference/Built-In/tbIDE/HtmlElement.md  |   2 +-
 .../Built-In/tbIDE/HtmlElementProperties.md   |   2 +-
 16 files changed, 434 insertions(+), 3 deletions(-)
 create mode 100644 bugs/on-property-ignored/on-property-ignored.twinproj
 create mode 100644 bugs/on-property-ignored/repro.json
 create mode 100644 bugs/on-property-ignored/src/Settings
 create mode 100644 bugs/on-property-ignored/src/Sources/Startup.twin
 create mode 100644 bugs/raiseevent-plain-html-typeerror/raiseevent-plain-html-typeerror.twinproj
 create mode 100644 bugs/raiseevent-plain-html-typeerror/repro.json
 create mode 100644 bugs/raiseevent-plain-html-typeerror/src/Settings
 create mode 100644 bugs/raiseevent-plain-html-typeerror/src/Sources/Startup.twin
 create mode 100644 bugs/two-calling-conventions-accepted/repro.json
 create mode 100644 bugs/two-calling-conventions-accepted/src/Settings
 create mode 100644 bugs/two-calling-conventions-accepted/src/Sources/Startup.twin
 create mode 100644 bugs/two-calling-conventions-accepted/two-calling-conventions-accepted.twinproj

diff --git a/BUGS-TO-REPORT.md b/BUGS-TO-REPORT.md
index 3aee78263..383e47096 100644
--- a/BUGS-TO-REPORT.md
+++ b/BUGS-TO-REPORT.md
@@ -1684,3 +1684,133 @@ What reproduces it besides the plain case: the clash in another letter case, suc
 Severity: moderate. A `[RunAfterBuild]` Sub runs after the exe is built, for example to sign it, and here it is skipped while the build reports success. Nothing points at the module's name as the cause, so the project's owner has to find it by renaming modules.
 
 <!-- Reproducer: bugs/module-named-like-project/ (mode run, exe true; expects exit 5, the console's `[BUILD] Executing 'ModuleNamedLikeProject.ModuleNamedLikeProject.<Sub>'...` line, and no `RunAfterBuild ran`); verified on BETA 995 and 997 by `bug_repro.mjs verify`, with a copy whose module is named Runner as the control (exit 0, `RunAfterBuild ran`, verify says NO LONGER REPRODUCES). `bug_repro.mjs run` needs --exe by hand, because a project may hold one [RunAfterBuild] (TB5114) and this one's own is the subject; verify takes exe from repro.json. The harness wraps the Sub, so run's console names `tbrun_RunProbe`; a build in the IDE names the Sub itself. Steps 3 and 4 were checked on BETA 995 and 997 by building the reproducer, and a copy with the module named Runner, with `tbbuild --build --keep` and reading the DEBUG CONSOLE. The other-case and empty-module variants were checked on BETA 995 and 997 in scratch trees that are not in the reproducer. VB6: `bug_repro.mjs vb6 module-named-like-project` prints the refusal; the empty-module form was built in a scratch copy. docs/Reference/Attributes.md (#runafterbuild) carries a WARNING callout for this; once a fixed build is released, it becomes a NOTE saying since which build. WIP.ExamplesBuild.md (the bullet "No generated module may be named like the project") and scripts/check_examples.mjs (the comment on its three collision rules) state the rule for generated modules; they called the clash an ambiguous call that the IDE refuses at execution time, and were corrected with this entry. When fixed: say in both since which build the rule is no longer needed, or remove it. -->
+
+---
+
+## A declaration that names two calling conventions compiles without a diagnostic
+
+**Describe the bug**
+An API declaration, a procedure, a delegate or an interface member can name its calling convention after its name, and the compiler accepts two conventions on one declaration, in either order, with no error or warning. The call then uses one of them. In every pair tried on a `Declare`, `CDecl` is dropped and the other keyword is used, whichever comes first.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `two-calling-conventions-accepted.twinproj` (attached as `two-calling-conventions-accepted.zip`). Its `Startup.twin` declares `RtlUlongByteSwap`, which `ntdll` exports as fastcall on a 32-bit build (its one argument in ECX), under several conventions:
+   ```
+   Private Declare PtrSafe Function SwapFast FastCall Lib "ntdll" Alias "RtlUlongByteSwap" (ByVal Source As Long) As Long
+   Private Declare PtrSafe Function SwapCdecl CDecl Lib "ntdll" Alias "RtlUlongByteSwap" (ByVal Source As Long) As Long
+   Private Declare PtrSafe Function SwapFastCdecl FastCall CDecl Lib "ntdll" Alias "RtlUlongByteSwap" (ByVal Source As Long) As Long
+   Private Declare PtrSafe Function SwapCdeclFast CDecl FastCall Lib "ntdll" Alias "RtlUlongByteSwap" (ByVal Source As Long) As Long
+   Private Declare PtrSafe Function SwapThisCdecl ThisCall CDecl Lib "ntdll" Alias "RtlUlongByteSwap" (ByVal Source As Long) As Long
+   Private Declare PtrSafe Function SwapCdeclThis CDecl ThisCall Lib "ntdll" Alias "RtlUlongByteSwap" (ByVal Source As Long) As Long
+   ```
+   It also holds a delegate (`CDecl FastCall`), a procedure in a module (`CDecl ThisCall`) and an interface member (`ThisCall CDecl`), each naming two conventions. `Sub Main` prints the result of each `Declare` for `&H11223344`.
+2. Compile it. The Problems panel reports 0 errors and 0 warnings.
+3. Run it (win32). The DEBUG CONSOLE prints:
+   ```
+   FastCall:        44332211
+   FastCall CDecl:  44332211
+   CDecl FastCall:  44332211
+   ThisCall CDecl:  44332211
+   CDecl ThisCall:  44332211
+   CDecl:           1EEC6F00
+   ```
+   The last value changes from run to run: called as cdecl, the function swaps whatever ECX held. Every pair is called as fastcall or thiscall, which pass this one argument the same way.
+
+**Expected behavior**
+A declaration has one calling convention, so the second keyword is refused with an error that names it. As it is, nothing says which of the two the call uses, and when one of them is `CDecl`, it is dropped without a word.
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 997
+
+**Additional context**
+Also on BETA 995, identically apart from the cdecl value.
+
+Only the `Declare` pairs are observed at run time. The delegate, the procedure and the interface member are only compiled, so which convention they use is not known. Not tried: `FastCall` with `ThisCall`, which this function cannot tell apart, and a 64-bit build, where the conventions have no effect.
+
+Severity: low. It takes a mistake to trigger it, but the mistake goes unreported, and a declaration meant as cdecl that names a second convention by accident calls the function the wrong way.
+
+<!-- Reproducer: bugs/two-calling-conventions-accepted/ (mode run, expects exit 0 and the four pair lines with 44332211); verified on BETA 995 and 997 by `bug_repro.mjs verify` and `run`, and `compile` reports no diagnostic on 997. Stated in docs/Features/Advanced/API-Declarations.md, section "Calling Conventions", the sentences after the table that begin "Name at most one convention" (they name BETA 997): when fixed, say that a second convention is an error, with no mention of the defect. -->
+
+---
+
+## `raiseEvent` in a tool window's own HTML throws a TypeError, and the add-in's listener is not called
+
+**Describe the bug**
+An add-in sets a tool window's HTML with an inline handler that calls `raiseEvent`, as the list-view items of Sample 15 do, and registers a listener for the event with `AddEventListener` on the parent element. Clicking the element does not call the listener, and the add-in is told nothing. The IDE's page throws `TypeError: Cannot read properties of null (reading 'rootEventHandler')`: `raiseEvent` goes up through `parentNode` looking for an element that has `rootEventHandler`, and in plain tool-window HTML no element has one, so it goes past the document.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `raiseevent-plain-html-typeerror.twinproj` (attached as `raiseevent-plain-html-typeerror.zip`). It is an add-in, and its tool window is built like this:
+   ```
+   With Pane.RootDomElement.ChildDomElements.Add("box", "div")
+       .AddEventListener("myEvent", AddressOf MyEvent)
+       .Properties.innerHTML = _
+           "<span id='raise' onclick='raiseEvent(""myEvent"", event, true, ""a"")'>[raise]</span> " & _
+           "<span id='direct' onclick='this.parentNode.myEvent(event)'>[direct]</span>"
+   End With
+   ```
+   `MyEvent` prints `myEvent from <id of the element clicked>` to the DEBUG CONSOLE.
+2. Build it (win32). Copy `Build\RaiseeventPlainHtmlTypeerror_win32.dll` into `%APPDATA%\twinBASIC\addins\win32\`, restart the IDE and open any project.
+3. Click the toolbar button **raiseEvent repro**. A tool window opens with **[raise]** and **[direct]**.
+4. Click **[raise]**. Nothing is printed, and the IDE's page has the uncaught `TypeError` above.
+5. Click **[direct]**. The DEBUG CONSOLE prints `myEvent from direct`.
+
+**Expected behavior**
+Step 4 prints `myEvent from raise`: `raiseEvent` calls the listener the div registered, as calling it directly does in step 5. If `raiseEvent` is meant only for list views and Monaco widgets, it stops at the document without throwing.
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 997
+
+**Additional context**
+Also on BETA 995.
+
+The workaround is step 5's: an inline handler that calls the function `AddEventListener` stores on the element under the event's name.
+
+Severity: low. A workaround exists, but nothing tells the add-in's author why the listener is not called: the exception shows only in the IDE's own page.
+
+<!-- Reproducer: bugs/raiseevent-plain-html-typeerror/ (mode manual: an add-in has to be built into an IDE's add-in folder, which nothing here may do outside a lane). Asserted by `addin-test.bat --only panes` (test/addin/panes.test.mjs, "P12: raiseEvent from plain tool-window HTML throws, and the add-in hears nothing", and the direct call after it), which passes on BETA 995 and 997. The reproducer is a cut-down copy of that lane's PanesProbe add-in (test/addin/probes/panes), compiled clean on 997 by `bug_repro.mjs compile`, and not itself run in a lane. The raiseEvent source quoted is from BETA 997's ide/main.js. Stated in docs/Reference/Built-In/tbIDE/HtmlElement.md, the NOTE under "raiseEvent" (names BETA 997), and in WIP.HelpAddin.md (P12): when fixed, update that test and P12, and state in the NOTE what raiseEvent does in plain HTML, with no mention of the defect. -->
+
+---
+
+## Setting a property whose name starts with `on` through `HtmlElementProperties` does nothing, and raises no error
+
+**Describe the bug**
+An add-in that sets an event-handler property of a tool-window element through `HtmlElementProperties`, such as `.Properties.onclick = "..."`, gets no error, and the element has no handler: a click does nothing, and the element has neither an `onclick` property nor an `onclick` attribute. The same handler written inline in `innerHTML` runs. The IDE page's property setter skips any property whose last name starts with `on`, with an empty branch (`if(a.indexOf("on")==0){}`), and reports success.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `on-property-ignored.twinproj` (attached as `on-property-ignored.zip`). It is an add-in, and its tool window is built like this:
+   ```
+   With .Add("property", "div")
+       .Properties.innerText = "[property]"
+       On Error Resume Next
+       .Properties.onclick = "this.innerText = 'clicked'"
+       Host.DebugConsole.PrintText "onclick set, error " & Err.Number
+       On Error GoTo 0
+   End With
+   With .Add("inline", "div")
+       .Properties.innerHTML = "<span onclick=""this.innerText = 'clicked'"">[inline]</span>"
+   End With
+   ```
+2. Build it (win32). Copy `Build\OnPropertyIgnored_win32.dll` into `%APPDATA%\twinBASIC\addins\win32\`, restart the IDE and open any project.
+3. Click the toolbar button **on property repro**. A tool window opens with **[property]** and **[inline]**, and the DEBUG CONSOLE prints `onclick set, error 0`.
+4. Click **[property]**. Nothing happens.
+5. Click **[inline]**. Its text changes to `clicked`.
+
+**Expected behavior**
+Either the property is set, as every other property is, and step 4 changes the text; or, if handler properties are refused on purpose, the assignment raises an error that says so, and step 3 prints a nonzero error.
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 997
+
+**Additional context**
+Also on BETA 995.
+
+Only `onclick` was tried. The setter's test is on the name, so it applies to every name that starts with `on`.
+
+Severity: low. `AddEventListener` and inline handlers work, but an add-in that sets a handler property gets neither the handler nor an error.
+
+<!-- Reproducer: bugs/on-property-ignored/ (mode manual: an add-in has to be built into an IDE's add-in folder, which nothing here may do outside a lane). Asserted by `addin-test.bat --only panes` (test/addin/panes.test.mjs, 'P4: a property whose name starts with "on" is dropped, and the add-in is told nothing'), which passes on BETA 995 and 997. The reproducer is a cut-down copy of that lane's PanesProbe add-in (test/addin/probes/panes), compiled clean on 997 by `bug_repro.mjs compile`, and not itself run in a lane. The setter source quoted is from BETA 997's ide/main.js. Stated in docs/Reference/Built-In/tbIDE/HtmlElementProperties.md, the NOTE that begins "A property whose name starts with `on` is ignored" (names BETA 997), and in WIP.HelpAddin.md (P4): when fixed, update that test and P4, and remove the NOTE or replace it with what the setter now does. -->
diff --git a/bugs/on-property-ignored/on-property-ignored.twinproj b/bugs/on-property-ignored/on-property-ignored.twinproj
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diff --git a/bugs/on-property-ignored/repro.json b/bugs/on-property-ignored/repro.json
new file mode 100644
index 000000000..beb5a0133
--- /dev/null
+++ b/bugs/on-property-ignored/repro.json
@@ -0,0 +1,4 @@
+{
+  "mode": "manual",
+  "steps": "1. Open on-property-ignored.twinproj in the twinBASIC IDE and build it (win32). Copy Build\\OnPropertyIgnored_win32.dll into %APPDATA%\\twinBASIC\\addins\\win32\\, restart the IDE and open any project.\n2. Click the toolbar button on property repro. A tool window opens with [property] and [inline], and the DEBUG CONSOLE prints onclick set, error 0.\n3. Click [property]. Expected: its text changes to clicked, or step 2 raised an error. Actual: nothing happens; the element has no onclick handler and no onclick attribute.\n4. Control: click [inline]. Its text changes to clicked.\nAsserted on BETA 995 and 997 by `addin-test.bat --only panes` (P4, the PanesProbe add-in in test/addin/probes/panes, of which this project is a cut-down copy)."
+}
diff --git a/bugs/on-property-ignored/src/Settings b/bugs/on-property-ignored/src/Settings
new file mode 100644
index 000000000..b0b0addd6
--- /dev/null
+++ b/bugs/on-property-ignored/src/Settings
@@ -0,0 +1,46 @@
+{
+	"configuration.inherits": "Defaults",
+	"project.appTitle": "OnPropertyIgnored",
+	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
+	"project.buildType": "Standard DLL",
+	"project.description": "Reproduces: Setting a property whose name starts with `on` through `HtmlElementProperties` does nothing, and raises no error",
+	"project.exportPathIsV2": true,
+	"project.id": "{26B62393-7D96-4393-A9BC-FEAE2891D137}",
+	"project.name": "OnPropertyIgnored",
+	"project.optionExplicit": true,
+	"project.references": [
+		{
+			"id": "{00020430-0000-0000-C000-000000000046}",
+			"lcid": 0,
+			"name": "OLE Automation",
+			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
+			"path64": "C:\\Windows\\System32\\stdole2.tlb",
+			"symbolId": "stdole",
+			"versionMajor": 2,
+			"versionMinor": 0
+		},
+		{
+			"id": "{99DEC38C-75F6-4488-8EE7-2D52D83881D2}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC IDE Extensibility Package",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "tbIDE",
+			"versionBuild": 0,
+			"versionMajor": 0,
+			"versionMinor": 0,
+			"versionRevision": 1
+		}
+	],
+	"project.settingsVersion": 1,
+	"project.warnings": {
+		"errors": [],
+		"hints": [],
+		"ignored": [],
+		"info": [],
+		"warnings": []
+	},
+	"runtime.useUnicodeStandardLibrary": true
+}
diff --git a/bugs/on-property-ignored/src/Sources/Startup.twin b/bugs/on-property-ignored/src/Sources/Startup.twin
new file mode 100644
index 000000000..e862793e0
--- /dev/null
+++ b/bugs/on-property-ignored/src/Sources/Startup.twin
@@ -0,0 +1,47 @@
+' An add-in. Once a project is open, its toolbar button "on property repro"
+' opens a tool window with two divs. Clicking either one is meant to change its
+' text to "clicked": "property" has its onclick set through Properties, and
+' "inline" has the same handler written in its HTML.
+Module Startup
+    [DllExport]
+    Public Function tbCreateCompilerAddin(ByVal Host As Host) As AddIn
+        Return New ReproAddin(Host)
+    End Function
+End Module
+
+Private Class ReproAddin
+    Implements AddIn
+    Private WithEvents Host As Host
+    Private WithEvents ShowButton As Button
+    Private Pane As ToolWindow
+
+    Public Sub New(ByVal Host As Host)
+        Set Me.Host = Host
+    End Sub
+
+    Private Property Get AddIn_Name() As String
+        Return "on property repro"
+    End Property
+
+    Private Sub Host_OnProjectLoaded()
+        Set ShowButton = Host.Toolbars(0).AddButton("OnPropertyReproShow", "on property repro")
+    End Sub
+
+    Private Sub ShowButton_OnClick()
+        Set Pane = Host.ToolWindows.Add("on property repro", "OnPropertyReproPane")
+        Pane.Title = "ON PROPERTY REPRO"
+        With Pane.RootDomElement.ChildDomElements
+            With .Add("property", "div")
+                .Properties.innerText = "[property]"
+                On Error Resume Next
+                .Properties.onclick = "this.innerText = 'clicked'"
+                Host.DebugConsole.PrintText "onclick set, error " & Err.Number
+                On Error GoTo 0
+            End With
+            With .Add("inline", "div")
+                .Properties.innerHTML = "<span onclick=""this.innerText = 'clicked'"">[inline]</span>"
+            End With
+        End With
+        Pane.Visible = True
+    End Sub
+End Class
diff --git a/bugs/raiseevent-plain-html-typeerror/raiseevent-plain-html-typeerror.twinproj b/bugs/raiseevent-plain-html-typeerror/raiseevent-plain-html-typeerror.twinproj
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diff --git a/bugs/raiseevent-plain-html-typeerror/repro.json b/bugs/raiseevent-plain-html-typeerror/repro.json
new file mode 100644
index 000000000..3cc49d720
--- /dev/null
+++ b/bugs/raiseevent-plain-html-typeerror/repro.json
@@ -0,0 +1,4 @@
+{
+  "mode": "manual",
+  "steps": "1. Open raiseevent-plain-html-typeerror.twinproj in the twinBASIC IDE and build it (win32). Copy Build\\RaiseeventPlainHtmlTypeerror_win32.dll into %APPDATA%\\twinBASIC\\addins\\win32\\, restart the IDE and open any project.\n2. Click the toolbar button raiseEvent repro. A tool window opens with [raise] and [direct].\n3. Click [raise]. Expected: the DEBUG CONSOLE prints myEvent from raise. Actual: nothing is printed, and the IDE's page has an uncaught TypeError: Cannot read properties of null (reading 'rootEventHandler').\n4. Control: click [direct]. The DEBUG CONSOLE prints myEvent from direct.\nAsserted on BETA 995 and 997 by `addin-test.bat --only panes` (P12, the PanesProbe add-in in test/addin/probes/panes, of which this project is a cut-down copy)."
+}
diff --git a/bugs/raiseevent-plain-html-typeerror/src/Settings b/bugs/raiseevent-plain-html-typeerror/src/Settings
new file mode 100644
index 000000000..436d96f66
--- /dev/null
+++ b/bugs/raiseevent-plain-html-typeerror/src/Settings
@@ -0,0 +1,46 @@
+{
+	"configuration.inherits": "Defaults",
+	"project.appTitle": "RaiseeventPlainHtmlTypeerror",
+	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
+	"project.buildType": "Standard DLL",
+	"project.description": "Reproduces: `raiseEvent` in a tool window's own HTML throws a TypeError, and the add-in's listener is not called",
+	"project.exportPathIsV2": true,
+	"project.id": "{2AE1CC14-228C-47AB-82CE-5BAA17DC4510}",
+	"project.name": "RaiseeventPlainHtmlTypeerror",
+	"project.optionExplicit": true,
+	"project.references": [
+		{
+			"id": "{00020430-0000-0000-C000-000000000046}",
+			"lcid": 0,
+			"name": "OLE Automation",
+			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
+			"path64": "C:\\Windows\\System32\\stdole2.tlb",
+			"symbolId": "stdole",
+			"versionMajor": 2,
+			"versionMinor": 0
+		},
+		{
+			"id": "{99DEC38C-75F6-4488-8EE7-2D52D83881D2}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC IDE Extensibility Package",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "tbIDE",
+			"versionBuild": 0,
+			"versionMajor": 0,
+			"versionMinor": 0,
+			"versionRevision": 1
+		}
+	],
+	"project.settingsVersion": 1,
+	"project.warnings": {
+		"errors": [],
+		"hints": [],
+		"ignored": [],
+		"info": [],
+		"warnings": []
+	},
+	"runtime.useUnicodeStandardLibrary": true
+}
diff --git a/bugs/raiseevent-plain-html-typeerror/src/Sources/Startup.twin b/bugs/raiseevent-plain-html-typeerror/src/Sources/Startup.twin
new file mode 100644
index 000000000..51917c936
--- /dev/null
+++ b/bugs/raiseevent-plain-html-typeerror/src/Sources/Startup.twin
@@ -0,0 +1,46 @@
+' An add-in. Once a project is open, its toolbar button "raiseEvent repro"
+' opens a tool window with two spans. Both are meant to call the listener
+' that AddEventListener registers as "myEvent" on their parent div:
+' "raise" through raiseEvent, as the list view items of Sample 15 do, and
+' "direct" by calling the function AddEventListener stored on the div.
+Module Startup
+    [DllExport]
+    Public Function tbCreateCompilerAddin(ByVal Host As Host) As AddIn
+        Return New ReproAddin(Host)
+    End Function
+End Module
+
+Private Class ReproAddin
+    Implements AddIn
+    Private WithEvents Host As Host
+    Private WithEvents ShowButton As Button
+    Private Pane As ToolWindow
+
+    Public Sub New(ByVal Host As Host)
+        Set Me.Host = Host
+    End Sub
+
+    Private Property Get AddIn_Name() As String
+        Return "raiseEvent repro"
+    End Property
+
+    Private Sub Host_OnProjectLoaded()
+        Set ShowButton = Host.Toolbars(0).AddButton("RaiseEventReproShow", "raiseEvent repro")
+    End Sub
+
+    Private Sub ShowButton_OnClick()
+        Set Pane = Host.ToolWindows.Add("raiseEvent repro", "RaiseEventReproPane")
+        Pane.Title = "RAISEEVENT REPRO"
+        With Pane.RootDomElement.ChildDomElements.Add("box", "div")
+            .AddEventListener("myEvent", AddressOf MyEvent)
+            .Properties.innerHTML = _
+                "<span id='raise' onclick='raiseEvent(""myEvent"", event, true, ""a"")'>[raise]</span> " & _
+                "<span id='direct' onclick='this.parentNode.myEvent(event)'>[direct]</span>"
+        End With
+        Pane.Visible = True
+    End Sub
+
+    Private Sub MyEvent(ByVal eventInfo As HtmlEventProperties)
+        Host.DebugConsole.PrintText "myEvent from " & eventInfo.target.id
+    End Sub
+End Class
diff --git a/bugs/two-calling-conventions-accepted/repro.json b/bugs/two-calling-conventions-accepted/repro.json
new file mode 100644
index 000000000..4f4c37de7
--- /dev/null
+++ b/bugs/two-calling-conventions-accepted/repro.json
@@ -0,0 +1,12 @@
+{
+  "mode": "run",
+  "expect": {
+    "exit": 0,
+    "output": [
+      "^FastCall CDecl: +44332211$",
+      "^CDecl FastCall: +44332211$",
+      "^ThisCall CDecl: +44332211$",
+      "^CDecl ThisCall: +44332211$"
+    ]
+  }
+}
diff --git a/bugs/two-calling-conventions-accepted/src/Settings b/bugs/two-calling-conventions-accepted/src/Settings
new file mode 100644
index 000000000..5c385d9ca
--- /dev/null
+++ b/bugs/two-calling-conventions-accepted/src/Settings
@@ -0,0 +1,61 @@
+{
+	"configuration.inherits": "Defaults",
+	"project.appTitle": "TwoCallingConventionsAccepted",
+	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
+	"project.buildType": "Standard EXE",
+	"project.description": "Reproduces: A declaration that names two calling conventions compiles without a diagnostic",
+	"project.exportPathIsV2": true,
+	"project.id": "{01FC4406-FC9C-4EBB-A5F5-0E15C3B6F1D2}",
+	"project.name": "TwoCallingConventionsAccepted",
+	"project.optionExplicit": true,
+	"project.references": [
+		{
+			"id": "{00020430-0000-0000-C000-000000000046}",
+			"lcid": 0,
+			"name": "OLE Automation",
+			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
+			"path64": "C:\\Windows\\System32\\stdole2.tlb",
+			"symbolId": "stdole",
+			"versionMajor": 2,
+			"versionMinor": 0
+		},
+		{
+			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "VB",
+			"versionBuild": 0,
+			"versionMajor": 0,
+			"versionMinor": 0,
+			"versionRevision": 31
+		},
+		{
+			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "AppGlobalClassProject",
+			"versionBuild": 0,
+			"versionMajor": 1,
+			"versionMinor": 0,
+			"versionRevision": 0
+		}
+	],
+	"project.settingsVersion": 1,
+	"project.startupObject": "Sub Main",
+	"project.warnings": {
+		"errors": [],
+		"hints": [],
+		"ignored": [],
+		"info": [],
+		"warnings": []
+	},
+	"runtime.useUnicodeStandardLibrary": true
+}
diff --git a/bugs/two-calling-conventions-accepted/src/Sources/Startup.twin b/bugs/two-calling-conventions-accepted/src/Sources/Startup.twin
new file mode 100644
index 000000000..654341065
--- /dev/null
+++ b/bugs/two-calling-conventions-accepted/src/Sources/Startup.twin
@@ -0,0 +1,35 @@
+' Every declaration below names two calling conventions, and the project
+' compiles with no diagnostic. On a 32-bit build, ntdll exports
+' RtlUlongByteSwap as fastcall: it takes its argument in ECX.
+
+[InterfaceId("6B0C2F61-3D1E-4C8A-9F0B-2A7E5D4C3B21")]
+[OleAutomation(False)]
+Interface ITwo Extends IUnknown
+    Function Add ThisCall CDecl(ByVal Amount As Long) As Long
+End Interface
+
+Module Startup
+
+    Private Declare PtrSafe Function SwapFast FastCall Lib "ntdll" Alias "RtlUlongByteSwap" (ByVal Source As Long) As Long
+    Private Declare PtrSafe Function SwapCdecl CDecl Lib "ntdll" Alias "RtlUlongByteSwap" (ByVal Source As Long) As Long
+    Private Declare PtrSafe Function SwapFastCdecl FastCall CDecl Lib "ntdll" Alias "RtlUlongByteSwap" (ByVal Source As Long) As Long
+    Private Declare PtrSafe Function SwapCdeclFast CDecl FastCall Lib "ntdll" Alias "RtlUlongByteSwap" (ByVal Source As Long) As Long
+    Private Declare PtrSafe Function SwapThisCdecl ThisCall CDecl Lib "ntdll" Alias "RtlUlongByteSwap" (ByVal Source As Long) As Long
+    Private Declare PtrSafe Function SwapCdeclThis CDecl ThisCall Lib "ntdll" Alias "RtlUlongByteSwap" (ByVal Source As Long) As Long
+
+    Private Delegate Function TwoDelegate CDecl FastCall (ByVal x As Long) As Long
+
+    Public Function TwoProcedure CDecl ThisCall(ByVal x As Long) As Long
+        Return x
+    End Function
+
+    Public Sub Main()
+        Debug.Print "FastCall:        " & Hex$(SwapFast(&H11223344))
+        Debug.Print "FastCall CDecl:  " & Hex$(SwapFastCdecl(&H11223344))
+        Debug.Print "CDecl FastCall:  " & Hex$(SwapCdeclFast(&H11223344))
+        Debug.Print "ThisCall CDecl:  " & Hex$(SwapThisCdecl(&H11223344))
+        Debug.Print "CDecl ThisCall:  " & Hex$(SwapCdeclThis(&H11223344))
+        Debug.Print "CDecl:           " & Hex$(SwapCdecl(&H11223344))
+    End Sub
+
+End Module
diff --git a/bugs/two-calling-conventions-accepted/two-calling-conventions-accepted.twinproj b/bugs/two-calling-conventions-accepted/two-calling-conventions-accepted.twinproj
new file mode 100644
index 0000000000000000000000000000000000000000..78b72ee6c968ac71c7677d58053747f1921126f6
GIT binary patch
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diff --git a/docs/Features/Advanced/API-Declarations.md b/docs/Features/Advanced/API-Declarations.md
index 253558eff..5cf6d49dd 100644
--- a/docs/Features/Advanced/API-Declarations.md
+++ b/docs/Features/Advanced/API-Declarations.md
@@ -38,7 +38,7 @@ The four follow the Microsoft C/C++ conventions of the same names: `__stdcall`,
 
 A 64-bit build has only one calling convention. There, all four keywords are accepted and have no effect.
 
-Name at most one convention. BETA 995 accepts two together without a diagnostic.
+Name at most one convention. BETA 997 accepts two together without a diagnostic, and on an API declaration it drops **CDecl** and uses the other one.
 
 ### Examples
 
diff --git a/docs/Reference/Built-In/tbIDE/HtmlElement.md b/docs/Reference/Built-In/tbIDE/HtmlElement.md
index 2a2524af7..3a6b746f3 100644
--- a/docs/Reference/Built-In/tbIDE/HtmlElement.md
+++ b/docs/Reference/Built-In/tbIDE/HtmlElement.md
@@ -100,7 +100,7 @@ raiseEvent(eventName, event, stopPropagation, ...customData)
 --- pass an event name (any string), the DOM `event` object, a boolean controlling propagation, and any number of trailing custom-data values. The addin then registers a listener with the same event name through **AddEventListener**, and the custom-data values arrive on the [**HtmlEventProperties**](HtmlEventProperties) as `eventInfo.customData0`, `eventInfo.customData1`, … (numerically indexed from zero). This pattern is used heavily in sample 13 (listview) and sample 15 (Global Search) to attach handlers to per-item buttons rendered inside a listview's HTML.
 
 > [!NOTE]
-> **raiseEvent** works only inside a `"listview"` or `"virtuallistview"` widget, or inside a widget added with [**CodeEditor.AddMonacoWidget**](CodeEditor#addmonacowidget). It passes the event to the nearest enclosing widget: in a list view, register the listener on the list view object, `.Properties.listview.AddEventListener("name", ...)`, as sample 15 does; in a code-editor widget, on the widget's own element. In plain tool-window HTML there is no such widget, and in BETA 995 **raiseEvent** throws a `TypeError` in the IDE's page and the listener is not called.
+> **raiseEvent** works only inside a `"listview"` or `"virtuallistview"` widget, or inside a widget added with [**CodeEditor.AddMonacoWidget**](CodeEditor#addmonacowidget). It passes the event to the nearest enclosing widget: in a list view, register the listener on the list view object, `.Properties.listview.AddEventListener("name", ...)`, as sample 15 does; in a code-editor widget, on the widget's own element. In plain tool-window HTML there is no such widget, and in BETA 997 **raiseEvent** throws a `TypeError` in the IDE's page and the listener is not called.
 >
 > From plain HTML, an inline handler can call the listener itself. **AddEventListener** stores a listener for a name that is not one of the element's DOM events on the element, under that name, so an inline `onclick='this.parentNode.myEvent(event)'` calls the listener its parent registered as `"myEvent"`, and `eventInfo.target.id` names the element clicked.
 
diff --git a/docs/Reference/Built-In/tbIDE/HtmlElementProperties.md b/docs/Reference/Built-In/tbIDE/HtmlElementProperties.md
index 43b458865..38576cf84 100644
--- a/docs/Reference/Built-In/tbIDE/HtmlElementProperties.md
+++ b/docs/Reference/Built-In/tbIDE/HtmlElementProperties.md
@@ -25,7 +25,7 @@ The shorthand reads at run time as a chain of `Item("name")` lookups against the
 > This interface is **`[COMExtensible(True)]`**. Property names are resolved against the live DOM element at run time, not declared statically on the interface. The compiler does not validate names --- a typo (`.innerTxt = "..."` instead of `.innerText = "..."`) fails silently or throws at run time. The accepted set is **every DOM property of the underlying tag**, plus any custom-widget extensions; the reference does not enumerate it.
 
 > [!NOTE]
-> A property whose name starts with `on` is ignored. In BETA 995, `.onclick = "..."` sets nothing, and the call returns without an error. Register a listener with [**HtmlElement.AddEventListener**](HtmlElement#addeventlistener) instead.
+> A property whose name starts with `on` is ignored. In BETA 997, `.onclick = "..."` sets nothing, and the call returns without an error. Register a listener with [**HtmlElement.AddEventListener**](HtmlElement#addeventlistener) instead.
 
 > [!IMPORTANT]
 > Text set as `innerHTML` is parsed as HTML, and an inline event handler in it runs as script of the IDE's own page, with access to everything that page's script can reach. An `<img>` whose image fails to load runs its `onerror` handler as soon as it is set, with nothing clicked. Escape any text that comes from a file, a project or the user before it goes into `innerHTML`, or set `innerText` instead.

From 2d80be4c1f1b4aa1f1e4dbce31aa0faa48840195 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 21:23:04 +0200
Subject: [PATCH 17/42] Boolean \ String and Mod give Boolean, as in VB6 (#2439
 not a bug); VB6 sides for #2439, #2455, #2452

---
 bugs/filed/boolean-intdiv-string/REPORT.md    |  2 +-
 .../boolean-intdiv-string/vb6/Module1.bas     | 30 ++++++++++++++++
 .../filed/boolean-intdiv-string/vb6/Probe.vbp |  7 ++++
 bugs/filed/err-raise-helpcontext/REPORT.md    |  9 +++++
 .../err-raise-helpcontext/vb6/Module1.bas     | 34 +++++++++++++++++++
 .../filed/err-raise-helpcontext/vb6/Probe.vbp |  7 ++++
 bugs/filed/llvm-err-after-raise/REPORT.md     |  6 +++-
 .../llvm-err-after-raise/vb6/Module1.bas      | 32 +++++++++++++++++
 bugs/filed/llvm-err-after-raise/vb6/Probe.vbp |  7 ++++
 docs/Reference/Core/IntegerDivide.md          | 11 +++++-
 docs/Reference/Core/Mod.md                    |  2 +-
 docs/Reference/Operators.md                   |  2 +-
 12 files changed, 144 insertions(+), 5 deletions(-)
 create mode 100644 bugs/filed/boolean-intdiv-string/vb6/Module1.bas
 create mode 100644 bugs/filed/boolean-intdiv-string/vb6/Probe.vbp
 create mode 100644 bugs/filed/err-raise-helpcontext/vb6/Module1.bas
 create mode 100644 bugs/filed/err-raise-helpcontext/vb6/Probe.vbp
 create mode 100644 bugs/filed/llvm-err-after-raise/vb6/Module1.bas
 create mode 100644 bugs/filed/llvm-err-after-raise/vb6/Probe.vbp

diff --git a/bugs/filed/boolean-intdiv-string/REPORT.md b/bugs/filed/boolean-intdiv-string/REPORT.md
index 3003404bf..50eff10d0 100644
--- a/bugs/filed/boolean-intdiv-string/REPORT.md
+++ b/bugs/filed/boolean-intdiv-string/REPORT.md
@@ -31,4 +31,4 @@ The `String` should be converted to a number, as every other operator does: `b +
 **Additional context**
 What does not reproduce it: every other operator converts the `String` to a number, as `b + "2"` and `b / "2"` above show, and so do `\` and `Mod` with the operands the other way round: `"2" \ b` is the `Long` -2. Also on BETA 983, with the same results. Severity: a wrong value and a wrong type, with no diagnostic.
 
-<!-- No docs page states this defect; docs/Reference/Operators.md describes the String conversion and the `\` and `Mod` result types, and was written against the correct behaviour. Measured with scripts/bug_repro.mjs (run mode, verify) on 995 and 983. Found by the result-type probe for that page. -->
+<!-- NOT A BUG: VB6 gives the same results, line for line (vb6/, `bug_repro.mjs vb6 boolean-intdiv-string`, 2026-10-05), so the issue is to be withdrawn; the comment saying so is drafted for the owner to post. A sweep of `+ - * / \ Mod` with a String against Byte, Integer, Long, Single, Double, Currency, Boolean, Date and String, both ways round, printed the same 108 lines in VB6 and in twinBASIC BETA 997: a Boolean on the left of a String is the only pairing under `\` and `Mod` that does not give a Long. docs/Reference/Operators.md, Core/IntegerDivide.md (with a check_run sample, same in VB6) and Core/Mod.md now state that exception. verify still says "reproduces", because repro.json expects the Boolean results; once the issue is closed, delete this folder. Found by the result-type probe for Operators.md. -->
diff --git a/bugs/filed/boolean-intdiv-string/vb6/Module1.bas b/bugs/filed/boolean-intdiv-string/vb6/Module1.bas
new file mode 100644
index 000000000..0d1321891
--- /dev/null
+++ b/bugs/filed/boolean-intdiv-string/vb6/Module1.bas
@@ -0,0 +1,30 @@
+Attribute VB_Name = "Module1"
+Option Explicit
+
+' The VB6 side of boolean-intdiv-string: the twinBASIC project's lines, written to out.txt.
+
+Sub Main()
+    Dim b As Boolean
+    Dim s As String
+    On Error GoTo Fail
+    Open App.Path & "\out.txt" For Output As #9
+    b = True
+    s = "2"
+
+    Print #9, "b \ ""2""   = "; b \ "2"; " "; TypeName(b \ "2")
+    Print #9, "b Mod ""2"" = "; b Mod "2"; " "; TypeName(b Mod "2")
+    Print #9, "b \ s     = "; b \ s; " "; TypeName(b \ s)
+    Print #9, "b Mod s   = "; b Mod s; " "; TypeName(b Mod s)
+
+    Print #9, "b \ 2.0   = "; b \ 2#; " "; TypeName(b \ 2#)
+    Print #9, "b Mod 2.0 = "; b Mod 2#; " "; TypeName(b Mod 2#)
+    Print #9, """2"" \ b   = "; "2" \ b; " "; TypeName("2" \ b)
+    Print #9, "b + ""2""   = "; b + "2"; " "; TypeName(b + "2")
+    Print #9, "b / ""2""   = "; b / "2"; " "; TypeName(b / "2")
+    Close #9
+    Exit Sub
+Fail:
+    On Error Resume Next
+    Print #9, "unhandled error " & Err.Number & ": " & Err.Description
+    Close #9
+End Sub
diff --git a/bugs/filed/boolean-intdiv-string/vb6/Probe.vbp b/bugs/filed/boolean-intdiv-string/vb6/Probe.vbp
new file mode 100644
index 000000000..4d210b0e8
--- /dev/null
+++ b/bugs/filed/boolean-intdiv-string/vb6/Probe.vbp
@@ -0,0 +1,7 @@
+Type=Exe
+Module=Module1; Module1.bas
+Startup="Sub Main"
+ExeName32="Probe.exe"
+Name="Probe"
+CompilationType=0
+OptimizationType=0
diff --git a/bugs/filed/err-raise-helpcontext/REPORT.md b/bugs/filed/err-raise-helpcontext/REPORT.md
index 8da9ef9d2..7af5a6371 100644
--- a/bugs/filed/err-raise-helpcontext/REPORT.md
+++ b/bugs/filed/err-raise-helpcontext/REPORT.md
@@ -21,6 +21,15 @@ What does work, each verified on its own: the same call with `Source:=`, `Descri
 **Expected behavior**
 The call compiles. `HelpContext` is what VBA itself names that parameter. Read out of the VBA type library on the machine this was found on (`VBE7.DLL` 7.01.1158, VBA7.1, via `LoadTypeLibEx` and `ITypeInfo::GetNames` on `_ErrObject`), the method is `Raise(Number, Source, Description, HelpFile, HelpContext)`. All five names are exactly the ones the failing call uses, and the call is Microsoft's own `Err.Source` example, named arguments and all, so the code twinBASIC rejects is the code a VBA developer is most likely to have copied. Four of the five names are accepted here; only the fifth is not.
 
+VB6 compiles the same call, named arguments and all, and its handler reads back every value passed (the project is attached as `err-raise-helpcontext-vb6.zip`; `myHelpFile` is `"my.hlp"` and `myHelpContext` is 42 there):
+```
+Number:       894 + vbObjectError
+Source:      MyApp.MyClass
+Description: Was not able to complete your task
+HelpFile:    my.hlp
+HelpContext:  42
+```
+
 **Desktop:**
  - OS: Windows 10 Pro 22H2 (build 19045)
  - twinBASIC compiler version: BETA 995
diff --git a/bugs/filed/err-raise-helpcontext/vb6/Module1.bas b/bugs/filed/err-raise-helpcontext/vb6/Module1.bas
new file mode 100644
index 000000000..0e60b8f36
--- /dev/null
+++ b/bugs/filed/err-raise-helpcontext/vb6/Module1.bas
@@ -0,0 +1,34 @@
+Attribute VB_Name = "Module1"
+Option Explicit
+
+' The VB6 side of err-raise-helpcontext: the twinBASIC project's call, with all five
+' arguments named, compiles; the handler writes what Err holds to out.txt.
+
+Sub Main()
+    On Error GoTo Fail
+    Open App.Path & "\out.txt" For Output As #9
+    T
+    Close #9
+    Exit Sub
+Fail:
+    On Error Resume Next
+    Print #9, "unhandled error " & Err.Number & ": " & Err.Description
+    Close #9
+End Sub
+
+Sub T()
+    Dim myHelpFile As String, myHelpContext As Long
+    myHelpFile = "my.hlp"
+    myHelpContext = 42
+    On Error GoTo Handler
+    Err.Raise vbObjectError + 894, Source:="MyApp.MyClass", _
+              Description:="Was not able to complete your task", _
+              HelpFile:=myHelpFile, HelpContext:=myHelpContext
+    Exit Sub
+Handler:
+    Print #9, "Number:      "; Err.Number - vbObjectError; "+ vbObjectError"
+    Print #9, "Source:      "; Err.Source
+    Print #9, "Description: "; Err.Description
+    Print #9, "HelpFile:    "; Err.HelpFile
+    Print #9, "HelpContext: "; Err.HelpContext
+End Sub
diff --git a/bugs/filed/err-raise-helpcontext/vb6/Probe.vbp b/bugs/filed/err-raise-helpcontext/vb6/Probe.vbp
new file mode 100644
index 000000000..4d210b0e8
--- /dev/null
+++ b/bugs/filed/err-raise-helpcontext/vb6/Probe.vbp
@@ -0,0 +1,7 @@
+Type=Exe
+Module=Module1; Module1.bas
+Startup="Sub Main"
+ExeName32="Probe.exe"
+Name="Probe"
+CompilationType=0
+OptimizationType=0
diff --git a/bugs/filed/llvm-err-after-raise/REPORT.md b/bugs/filed/llvm-err-after-raise/REPORT.md
index 18eb2ba48..8d6b5fd37 100644
--- a/bugs/filed/llvm-err-after-raise/REPORT.md
+++ b/bugs/filed/llvm-err-after-raise/REPORT.md
@@ -19,7 +19,11 @@ Steps to reproduce the behavior:
 2. See `-353703423 /  / Application-defined or object-defined error`. The project also calls the same procedure without the attribute, and that one prints `5 / MySrc / my text`.
 
 **Expected behavior**
-`5 / MySrc / my text`, as without the attribute.
+`5 / MySrc / my text`, as without the attribute. VB6 gives the same after `On Error Resume Next` and in an `On Error GoTo` handler (the project is attached as `llvm-err-after-raise-vb6.zip`):
+```
+plain:  5  / MySrc / my text
+GoTo:   5  / MySrc / my text
+```
 
 **Desktop:**
  - OS: Windows 10 Pro 22H2 (build 19045)
diff --git a/bugs/filed/llvm-err-after-raise/vb6/Module1.bas b/bugs/filed/llvm-err-after-raise/vb6/Module1.bas
new file mode 100644
index 000000000..ee198fd09
--- /dev/null
+++ b/bugs/filed/llvm-err-after-raise/vb6/Module1.bas
@@ -0,0 +1,32 @@
+Attribute VB_Name = "Module1"
+Option Explicit
+
+' The VB6 side of llvm-err-after-raise: what Err holds after a handled Err.Raise,
+' written to out.txt as the twinBASIC project's lines are.
+
+Sub Main()
+    On Error GoTo Fail
+    Open App.Path & "\out.txt" For Output As #9
+    ResumeNextRaise
+    GoToRaise
+    Close #9
+    Exit Sub
+Fail:
+    On Error Resume Next
+    Print #9, "unhandled error " & Err.Number & ": " & Err.Description
+    Close #9
+End Sub
+
+Private Sub ResumeNextRaise()
+    On Error Resume Next
+    Err.Raise 5, "MySrc", "my text"
+    Print #9, "plain: "; Err.Number; " / "; Err.Source; " / "; Err.Description
+End Sub
+
+Private Sub GoToRaise()
+    On Error GoTo Handler
+    Err.Raise 5, "MySrc", "my text"
+    Exit Sub
+Handler:
+    Print #9, "GoTo:  "; Err.Number; " / "; Err.Source; " / "; Err.Description
+End Sub
diff --git a/bugs/filed/llvm-err-after-raise/vb6/Probe.vbp b/bugs/filed/llvm-err-after-raise/vb6/Probe.vbp
new file mode 100644
index 000000000..4d210b0e8
--- /dev/null
+++ b/bugs/filed/llvm-err-after-raise/vb6/Probe.vbp
@@ -0,0 +1,7 @@
+Type=Exe
+Module=Module1; Module1.bas
+Startup="Sub Main"
+ExeName32="Probe.exe"
+Name="Probe"
+CompilationType=0
+OptimizationType=0
diff --git a/docs/Reference/Core/IntegerDivide.md b/docs/Reference/Core/IntegerDivide.md
index ee6f7ca05..68f42826f 100644
--- a/docs/Reference/Core/IntegerDivide.md
+++ b/docs/Reference/Core/IntegerDivide.md
@@ -25,7 +25,7 @@ Syntax:
 
 Before division is performed, the numeric expressions are rounded to whole numbers. A value exactly halfway between two whole numbers is rounded to the even one, so `6.5 \ 2` is 3 and `7.5 \ 2` is 4.
 
-Usually, the data type of *result* is a **Byte**, **Byte** variant, **Integer**, **Integer** variant, **Long**, **Long** variant, **LongLong**, or **LongLong** variant, regardless of whether *result* is a whole number: **Byte** when both expressions are **Byte**, **Integer** when both are **Byte**, **Integer** or **Boolean**, **LongLong** when either is **LongLong**, and **Long** otherwise. A declared **Decimal** expression gives a **Decimal** *result*, still a whole number; a **Decimal** held in a **Variant** gives a **Long**. See [Result types and promotion](../../Reference/Operators#result-types-and-promotion).
+Usually, the data type of *result* is a **Byte**, **Byte** variant, **Integer**, **Integer** variant, **Long**, **Long** variant, **LongLong**, or **LongLong** variant, regardless of whether *result* is a whole number: **Byte** when both expressions are **Byte**, **Integer** when both are **Byte**, **Integer** or **Boolean**, **LongLong** when either is **LongLong**, and **Long** otherwise. A **Boolean** *number1* with a **String** *number2* is the exception: the **String** is converted to **Boolean**, and *result* is a **Boolean**, so `True \ "2"` is **True**. A **String** *number1* with a **Boolean** *number2* gives a **Long**. A declared **Decimal** expression gives a **Decimal** *result*, still a whole number; a **Decimal** held in a **Variant** gives a **Long**. See [Result types and promotion](../../Reference/Operators#result-types-and-promotion).
 
 Any fractional portion of the quotient is discarded, so the quotient is truncated toward zero: `-7 \ 2` is -3. However, if any expression is **Null**, *result* is **Null**. Any expression that is **Empty** is treated as 0.
 
@@ -58,6 +58,15 @@ MyValue = 9 \ 3                 ' Returns 3.
 MyValue = 100 \ 3               ' Returns 33.
 ```
 
+A **Boolean** on the left of a **String** keeps the **Boolean** type, and the operands the other way round give a **Long**:
+
+```tb check_run
+Dim b As Boolean
+b = True
+Debug.Print TypeName(b \ "2"); " "; b \ "2"     ' Boolean True
+Debug.Print TypeName("2" \ b); " "; "2" \ b     ' Long -2
+```
+
 ### See Also
 
 - [**/** operator](Divide)
diff --git a/docs/Reference/Core/Mod.md b/docs/Reference/Core/Mod.md
index 2742b1ada..72c026591 100644
--- a/docs/Reference/Core/Mod.md
+++ b/docs/Reference/Core/Mod.md
@@ -26,7 +26,7 @@ Dim A As Long
 A = 19 Mod 6.7
 ```
 
-Usually, the data type of *result* is **Byte**, **Byte** variant, **Integer**, **Integer** variant, **Long**, **Variant** containing a **Long**, **LongLong**, or **Variant** containing a **LongLong**, regardless of whether *result* is a whole number. The type follows the same rules as for [the **\\** operator](IntegerDivide): a declared **Decimal** operand gives a **Decimal** *result*, still a whole number, and a **Decimal** held in a **Variant** gives a **Long**. See [Result types and promotion](../../Reference/Operators#result-types-and-promotion). Any fractional portion is truncated.
+Usually, the data type of *result* is **Byte**, **Byte** variant, **Integer**, **Integer** variant, **Long**, **Variant** containing a **Long**, **LongLong**, or **Variant** containing a **LongLong**, regardless of whether *result* is a whole number. The type follows the same rules as for [the **\\** operator](IntegerDivide), including its exception: a **Boolean** *number1* with a **String** *number2* gives a **Boolean**, so `True Mod "2"` is **False**. A declared **Decimal** operand gives a **Decimal** *result*, still a whole number, and a **Decimal** held in a **Variant** gives a **Long**. See [Result types and promotion](../../Reference/Operators#result-types-and-promotion). Any fractional portion is truncated.
 
 The *result* has the sign of *number1*: `-7 Mod 2` is -1, and `7 Mod -2` is 1.
 
diff --git a/docs/Reference/Operators.md b/docs/Reference/Operators.md
index b3a7aa8d3..fd701916e 100644
--- a/docs/Reference/Operators.md
+++ b/docs/Reference/Operators.md
@@ -127,7 +127,7 @@ The other operators:
 | Operator | Result type |
 |:---------|:------------|
 | `/` | **Decimal** if either operand is **Decimal**; otherwise **Single** if one operand is **Single** and the other is **Byte**, **Integer**, **Boolean** or **Single**; otherwise **Double** |
-| `\`, `Mod` | **Decimal** if either operand is **Decimal**; otherwise **LongLong** if either is **LongLong**; otherwise **Byte** if both are **Byte**, **Integer** if both are **Byte**, **Integer** or **Boolean**, and **Long** in every other case. The operands are rounded to whole numbers first, and a value exactly halfway goes to the even neighbour: `6.5 \ 2` is 3 and `7.5 \ 2` is 4 |
+| `\`, `Mod` | **Decimal** if either operand is **Decimal**; otherwise **LongLong** if either is **LongLong**; otherwise **Byte** if both are **Byte**, **Integer** if both are **Byte**, **Integer** or **Boolean**, and **Long** in every other case, except that a **Boolean** on the left of a **String** gives a **Boolean**: the **String** is converted to **Boolean** first, so `True \ "2"` is **True** (`-1 \ -1` is 1) and `True Mod "2"` is **False**. The operands are rounded to whole numbers first, and a value exactly halfway goes to the even neighbour: `6.5 \ 2` is 3 and `7.5 \ 2` is 4 |
 | `^` | **Double**, whatever the operand types |
 | `&` | **String** |
 | unary `-` | the operand's own type, except **Integer** for a **Byte** or **Boolean** and **Double** for a **String** |

From fca1f5896f4b6ce725ee4033e5e602ce2c40d177 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 21:30:35 +0200
Subject: [PATCH 18/42] #2439 closed as not a bug: its reproducer folder
 deleted

---
 bugs/filed/boolean-intdiv-string/REPORT.md    |  34 ----------
 .../boolean-intdiv-string.twinproj            | Bin 3031 -> 0 bytes
 bugs/filed/boolean-intdiv-string/repro.json   |  13 ----
 bugs/filed/boolean-intdiv-string/src/Settings |  61 ------------------
 .../src/Sources/Startup.twin                  |  20 ------
 .../boolean-intdiv-string/vb6/Module1.bas     |  30 ---------
 .../filed/boolean-intdiv-string/vb6/Probe.vbp |   7 --
 7 files changed, 165 deletions(-)
 delete mode 100644 bugs/filed/boolean-intdiv-string/REPORT.md
 delete mode 100644 bugs/filed/boolean-intdiv-string/boolean-intdiv-string.twinproj
 delete mode 100644 bugs/filed/boolean-intdiv-string/repro.json
 delete mode 100644 bugs/filed/boolean-intdiv-string/src/Settings
 delete mode 100644 bugs/filed/boolean-intdiv-string/src/Sources/Startup.twin
 delete mode 100644 bugs/filed/boolean-intdiv-string/vb6/Module1.bas
 delete mode 100644 bugs/filed/boolean-intdiv-string/vb6/Probe.vbp

diff --git a/bugs/filed/boolean-intdiv-string/REPORT.md b/bugs/filed/boolean-intdiv-string/REPORT.md
deleted file mode 100644
index 50eff10d0..000000000
--- a/bugs/filed/boolean-intdiv-string/REPORT.md
+++ /dev/null
@@ -1,34 +0,0 @@
-Filed as [twinbasic/twinbasic#2439](https://github.com/twinbasic/twinbasic/issues/2439).
-
-## `Boolean \ String` and `Boolean Mod String` convert the `String` to `Boolean`
-
-**Describe the bug**
-With a `Boolean` on the left and a `String` on the right, `\` and `Mod` convert the `String` to `Boolean` instead of to a number, so the result has the wrong value and the wrong type. There is no diagnostic.
-
-**To Reproduce**
-Steps to reproduce the behavior:
-1. Open `boolean-intdiv-string.twinproj` (attached as `boolean-intdiv-string.zip`) and run it (F5). Its `Sub Main` holds the whole bug:
-   ```
-   Dim b As Boolean = True
-   Debug.Print TypeName(b \ "2")
-   ```
-2. See `Boolean`, where `Long` is expected. The project prints these:
-
-   | expression | result | expected |
-   |---|---|---|
-   | `b \ "2"` | `Boolean` True | `Long` 0, as `b \ 2.0` gives |
-   | `b Mod "2"` | `Boolean` False | `Long` -1, as `b Mod 2.0` gives |
-
-The results are consistent with converting `"2"` to `Boolean` (`True`, -1) first: -1 \ -1 is 1, stored as `True`, and -1 Mod -1 is 0, stored as `False`. A `String` literal and a `String` variable on the right both reproduce it.
-
-**Expected behavior**
-The `String` should be converted to a number, as every other operator does: `b + "2"` is the `Double` 1 and `b / "2"` the `Double` -0.5. `b \ "2"` should be the `Long` 0, and `b Mod "2"` the `Long` -1, the same as with the number 2.0.
-
-**Desktop:**
- - OS: Windows 10 Pro 22H2 (build 19045)
- - twinBASIC compiler version: BETA 995
-
-**Additional context**
-What does not reproduce it: every other operator converts the `String` to a number, as `b + "2"` and `b / "2"` above show, and so do `\` and `Mod` with the operands the other way round: `"2" \ b` is the `Long` -2. Also on BETA 983, with the same results. Severity: a wrong value and a wrong type, with no diagnostic.
-
-<!-- NOT A BUG: VB6 gives the same results, line for line (vb6/, `bug_repro.mjs vb6 boolean-intdiv-string`, 2026-10-05), so the issue is to be withdrawn; the comment saying so is drafted for the owner to post. A sweep of `+ - * / \ Mod` with a String against Byte, Integer, Long, Single, Double, Currency, Boolean, Date and String, both ways round, printed the same 108 lines in VB6 and in twinBASIC BETA 997: a Boolean on the left of a String is the only pairing under `\` and `Mod` that does not give a Long. docs/Reference/Operators.md, Core/IntegerDivide.md (with a check_run sample, same in VB6) and Core/Mod.md now state that exception. verify still says "reproduces", because repro.json expects the Boolean results; once the issue is closed, delete this folder. Found by the result-type probe for Operators.md. -->
diff --git a/bugs/filed/boolean-intdiv-string/boolean-intdiv-string.twinproj b/bugs/filed/boolean-intdiv-string/boolean-intdiv-string.twinproj
deleted file mode 100644
index 37a58735d3513e24b301c04482ee8f26b8c883a1..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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diff --git a/bugs/filed/boolean-intdiv-string/repro.json b/bugs/filed/boolean-intdiv-string/repro.json
deleted file mode 100644
index 29a29855b..000000000
--- a/bugs/filed/boolean-intdiv-string/repro.json
+++ /dev/null
@@ -1,13 +0,0 @@
-{
-  "mode": "run",
-  "expect": {
-    "exit": 0,
-    "output": [
-      "^b \\\\ \"2\"\\s+= True Boolean$",
-      "^b Mod \"2\" = False Boolean$",
-      "^b \\\\ s\\s+= True Boolean$",
-      "^b Mod s\\s+= False Boolean$"
-    ]
-  },
-  "issue": 2439
-}
diff --git a/bugs/filed/boolean-intdiv-string/src/Settings b/bugs/filed/boolean-intdiv-string/src/Settings
deleted file mode 100644
index fa1b61944..000000000
--- a/bugs/filed/boolean-intdiv-string/src/Settings
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-	"configuration.inherits": "Defaults",
-	"project.appTitle": "BooleanIntdivString",
-	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
-	"project.buildType": "Standard EXE",
-	"project.description": "Reproduces: `Boolean \\ String` and `Boolean Mod String` convert the `String` to `Boolean`",
-	"project.exportPathIsV2": true,
-	"project.id": "{084C6717-68EE-47C6-A59C-477702219315}",
-	"project.name": "BooleanIntdivString",
-	"project.optionExplicit": true,
-	"project.references": [
-		{
-			"id": "{00020430-0000-0000-C000-000000000046}",
-			"lcid": 0,
-			"name": "OLE Automation",
-			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
-			"path64": "C:\\Windows\\System32\\stdole2.tlb",
-			"symbolId": "stdole",
-			"versionMajor": 2,
-			"versionMinor": 0
-		},
-		{
-			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "VB",
-			"versionBuild": 0,
-			"versionMajor": 0,
-			"versionMinor": 0,
-			"versionRevision": 31
-		},
-		{
-			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
-			"isCompilerPackage": true,
-			"licence": "MIT",
-			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
-			"path32": "",
-			"path64": "",
-			"publisher": "TWINBASIC-COMPILER",
-			"symbolId": "AppGlobalClassProject",
-			"versionBuild": 0,
-			"versionMajor": 1,
-			"versionMinor": 0,
-			"versionRevision": 0
-		}
-	],
-	"project.settingsVersion": 1,
-	"project.startupObject": "Sub Main",
-	"project.warnings": {
-		"errors": [],
-		"hints": [],
-		"ignored": [],
-		"info": [],
-		"warnings": []
-	},
-	"runtime.useUnicodeStandardLibrary": true
-}
diff --git a/bugs/filed/boolean-intdiv-string/src/Sources/Startup.twin b/bugs/filed/boolean-intdiv-string/src/Sources/Startup.twin
deleted file mode 100644
index 15665163c..000000000
--- a/bugs/filed/boolean-intdiv-string/src/Sources/Startup.twin
+++ /dev/null
@@ -1,20 +0,0 @@
-' Boolean \ String and Boolean Mod String convert the String to Boolean, not to a number.
-Module Startup
-
-    Public Sub Main()
-        Dim b As Boolean = True
-        Dim s As String = "2"
-
-        Debug.Print "b \ ""2""   = "; b \ "2"; " "; TypeName(b \ "2")       ' expected Long 0, got Boolean True
-        Debug.Print "b Mod ""2"" = "; b Mod "2"; " "; TypeName(b Mod "2")   ' expected Long -1, got Boolean False
-        Debug.Print "b \ s     = "; b \ s; " "; TypeName(b \ s)
-        Debug.Print "b Mod s   = "; b Mod s; " "; TypeName(b Mod s)
-
-        ' The same operators with the number 2.0, and with the operands the other way round.
-        Debug.Print "b \ 2.0   = "; b \ 2#; " "; TypeName(b \ 2#)
-        Debug.Print "b Mod 2.0 = "; b Mod 2#; " "; TypeName(b Mod 2#)
-        Debug.Print """2"" \ b   = "; "2" \ b; " "; TypeName("2" \ b)
-        Debug.Print "b + ""2""   = "; b + "2"; " "; TypeName(b + "2")
-    End Sub
-
-End Module
diff --git a/bugs/filed/boolean-intdiv-string/vb6/Module1.bas b/bugs/filed/boolean-intdiv-string/vb6/Module1.bas
deleted file mode 100644
index 0d1321891..000000000
--- a/bugs/filed/boolean-intdiv-string/vb6/Module1.bas
+++ /dev/null
@@ -1,30 +0,0 @@
-Attribute VB_Name = "Module1"
-Option Explicit
-
-' The VB6 side of boolean-intdiv-string: the twinBASIC project's lines, written to out.txt.
-
-Sub Main()
-    Dim b As Boolean
-    Dim s As String
-    On Error GoTo Fail
-    Open App.Path & "\out.txt" For Output As #9
-    b = True
-    s = "2"
-
-    Print #9, "b \ ""2""   = "; b \ "2"; " "; TypeName(b \ "2")
-    Print #9, "b Mod ""2"" = "; b Mod "2"; " "; TypeName(b Mod "2")
-    Print #9, "b \ s     = "; b \ s; " "; TypeName(b \ s)
-    Print #9, "b Mod s   = "; b Mod s; " "; TypeName(b Mod s)
-
-    Print #9, "b \ 2.0   = "; b \ 2#; " "; TypeName(b \ 2#)
-    Print #9, "b Mod 2.0 = "; b Mod 2#; " "; TypeName(b Mod 2#)
-    Print #9, """2"" \ b   = "; "2" \ b; " "; TypeName("2" \ b)
-    Print #9, "b + ""2""   = "; b + "2"; " "; TypeName(b + "2")
-    Print #9, "b / ""2""   = "; b / "2"; " "; TypeName(b / "2")
-    Close #9
-    Exit Sub
-Fail:
-    On Error Resume Next
-    Print #9, "unhandled error " & Err.Number & ": " & Err.Description
-    Close #9
-End Sub
diff --git a/bugs/filed/boolean-intdiv-string/vb6/Probe.vbp b/bugs/filed/boolean-intdiv-string/vb6/Probe.vbp
deleted file mode 100644
index 4d210b0e8..000000000
--- a/bugs/filed/boolean-intdiv-string/vb6/Probe.vbp
+++ /dev/null
@@ -1,7 +0,0 @@
-Type=Exe
-Module=Module1; Module1.bas
-Startup="Sub Main"
-ExeName32="Probe.exe"
-Name="Probe"
-CompilationType=0
-OptimizationType=0

From 396af8dcb0b0e54363cdda93424a5a5708de98b5 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 22:50:18 +0200
Subject: [PATCH 19/42] No reproducer needs a person at the IDE: bug_repro
 verify gains lane mode (a lane's tests) and probe mode (a script); the 20
 manual entries move to existing lanes, three new IDE lanes
 (typing-after-open, build-and-exit-silent, recent-projects-copies) and
 probe_shared_temp.mjs; all reproduce on BETA 997

---
 BUGS-TO-REPORT.md                             |  24 +-
 WIP.md                                        |   2 +-
 .../repro.json                                |   7 +-
 bugs/build-and-exit-silent/repro.json         |   9 +-
 bugs/clear-all-breakpoints-restart/repro.json |   6 +-
 bugs/concurrent-builds-shared-temp/repro.json |   9 +-
 .../console-completion-after-print/repro.json |   8 +-
 .../repro.json                                |   9 +-
 bugs/export-stops-at-readonly-file/repro.json |   6 +-
 bugs/filed/addin-shortcut-ctrl-alt/repro.json |   7 +-
 .../export-path-sourcepath-as-path/repro.json |   6 +-
 .../repro.json                                |   7 +-
 .../stop-at-error-ends-procedure/repro.json   |   7 +-
 bugs/filed/toolwindow-no-id/repro.json        |   6 +-
 .../typing-after-open-reversed/REPORT.md      |   2 +-
 .../typing-after-open-reversed/repro.json     |   9 +-
 bugs/import-package-unticked/repro.json       |  10 +-
 bugs/on-property-ignored/repro.json           |   6 +-
 .../repro.json                                |   6 +-
 bugs/recent-projects-copies/repro.json        |   8 +-
 .../repro.json                                |  11 +-
 bugs/step-key-leaves-step-pending/repro.json  |   6 +-
 bugs/udt-watch-codegen-error/repro.json       |   8 +-
 docs/Documentation/Tools.md                   |  48 ++-
 scripts/bug_repro.mjs                         | 225 ++++++++++++--
 scripts/lib/cli-cases.mjs                     |   2 +
 scripts/probe_shared_temp.mjs                 | 294 ++++++++++++++++++
 test/ide/build-and-exit-silent.test.mjs       | 135 ++++++++
 test/ide/lanes.mjs                            |   3 +
 test/ide/probes/typing-after-open/Settings    |  61 ++++
 .../typing-after-open/Sources/Haystack.twin   |   8 +
 .../typing-after-open/Sources/Main.twin       |   8 +
 test/ide/recent-projects-copies.test.mjs      | 127 ++++++++
 test/ide/typing-after-open.test.mjs           | 114 +++++++
 34 files changed, 1138 insertions(+), 66 deletions(-)
 create mode 100644 scripts/probe_shared_temp.mjs
 create mode 100644 test/ide/build-and-exit-silent.test.mjs
 create mode 100644 test/ide/probes/typing-after-open/Settings
 create mode 100644 test/ide/probes/typing-after-open/Sources/Haystack.twin
 create mode 100644 test/ide/probes/typing-after-open/Sources/Main.twin
 create mode 100644 test/ide/recent-projects-copies.test.mjs
 create mode 100644 test/ide/typing-after-open.test.mjs

diff --git a/BUGS-TO-REPORT.md b/BUGS-TO-REPORT.md
index 383e47096..ff6e01eb7 100644
--- a/BUGS-TO-REPORT.md
+++ b/BUGS-TO-REPORT.md
@@ -127,11 +127,15 @@ node scripts/impexp.mjs import bugs/<slug>/<slug>.twinproj bugs/<slug>/src --ove
 
 `bugs/<slug>/repro.json` says how to ask the compiler about the entry, and is committed with
 the reproducer: a `mode` of `compile`, `build`, `run`, `cli` (the compiler executable's own
-command line) or `manual`, and what a reproduction looks like in `expect`, such as the exit
-code of `tbbuild`, the diagnostic codes, or a regular expression the output must match.
-`verify` reads it for every entry and reports `reproduces`, `NO LONGER REPRODUCES` (the bug
-may be fixed on this build) or `manual`, which prints the `steps` it holds. It needs a
-twinBASIC install, and is run by a person, never by a gate or by CI.
+command line), `lane` (a lane of `ide-test.bat` or `addin-test.bat` and the tests in it that
+assert the bug), `probe` (a script under `scripts/`) or `manual`, and what a reproduction
+looks like in `expect`, such as the exit code of `tbbuild`, the diagnostic codes, or a
+regular expression the output must match. A bug that needs the IDE operated gets a lane
+test rather than `manual` steps, so that no entry needs a person at the IDE; `steps` still
+holds the recipe for the issue. `verify` reads it for every entry and reports `reproduces`,
+`NO LONGER REPRODUCES` (the bug may be fixed on this build) or `manual`, which prints the
+`steps` it holds. It needs a twinBASIC install, and is run by a person, never by a gate or
+by CI.
 
 **A VB6 comparison is a project of its own in `vb6/`**, made by `new <slug> "<entry title>" --with-vb6`
 from the template in `test/repro-templates/vb6/`. By convention `Probe.vbp` builds `Probe.exe`,
@@ -209,7 +213,7 @@ What does not reproduce it:
 
 So it takes at least one existing entry and at least one slot with nothing in it, which looks like each slot being read with the previous slot's value as its default. Once a duplicate is there, the next opened project keeps it: 18 copies of one project became 20 after one more open, with the new project on top. Both variants of step 2 (deleted slots, empty strings) were measured on BETA 995, ending with 21 values and 3 distinct projects.
 
-<!-- Manual in bugs/recent-projects-copies/repro.json because it changes the user's own registry. Stated in WIP.Harness.md (the recent-list tidy, which exists because of it) and scripts/lib/tb-registry.mjs; when fixed, the note there that a short list trips it can go. Measured 2026-09-23 on BETA 983 by reading the registry after tbbuild --keep opened a fixture project on a private desktop and the IDE was ended by its pid, and again on BETA 995 on 2026-10-01 (cli995/rec-995-*.txt). The harness trips it because every IDE a run starts opens a project: a run that began on a list of one entry once ended with seventeen copies of it. -->
+<!-- Lane mode in bugs/recent-projects-copies/repro.json: asserted by `ide-test.bat --only recent-projects-copies` (test/ide/recent-projects-copies.test.mjs), which passes on BETA 997; the test records the user's own list value by value and puts it back afterwards. Stated in WIP.Harness.md (the recent-list tidy, which exists because of it) and scripts/lib/tb-registry.mjs; when fixed, the note there that a short list trips it can go. Measured 2026-09-23 on BETA 983 by reading the registry after tbbuild --keep opened a fixture project on a private desktop and the IDE was ended by its pid, and again on BETA 995 on 2026-10-01 (cli995/rec-995-*.txt). The harness trips it because every IDE a run starts opens a project: a run that began on a list of one entry once ended with seventeen copies of it. -->
 
 ---
 
@@ -257,7 +261,7 @@ So exit 0 on a project with errors happens only for an error in code nothing cal
 
 Silence on stdout and stderr: measured on BETA 983 first, and on BETA 995 by redirecting the standard handles of the process to a file. The same redirection captures the compiler executable's own output (`twinBASIC_win32.exe settings <project>` wrote the whole `Settings` file), so the capture works.
 
-<!-- Manual in bugs/build-and-exit-silent/repro.json: the switch belongs to the IDE executable, which opens a window, so nothing here may run on the user's desktop. Measured with a scratch copy of scripts/lib/tb-launch.ps1 (private desktop, kill-on-close job, TBBUILD_CMD replacing the command line, standard handles redirected to a file), with scripts/lib/tb-registry.mjs startTidy and finishTidy around the run. Stated in scripts/tbbuild.mjs (header comment) and WIP.Harness.md, "Do not reach for --buildAndExit32 instead": when fixed, those two say the switch is unusable. So do docs/Documentation/Tools.md (the tbbuild section) and docs/Features/Packages/Import-export tool.md ("Compiling from the command line"). All four say exit 0 only for an error in code nothing calls, and a hang for an error the build reaches. -->
+<!-- Lane mode in bugs/build-and-exit-silent/repro.json: asserted by `ide-test.bat --only build-and-exit-silent` (test/ide/build-and-exit-silent.test.mjs, both cases, the IDE executable on a private desktop through launchOnDesktop), which passes on BETA 997. First measured with a scratch copy of scripts/lib/tb-launch.ps1 (private desktop, kill-on-close job, TBBUILD_CMD replacing the command line, standard handles redirected to a file), with scripts/lib/tb-registry.mjs startTidy and finishTidy around the run. Stated in scripts/tbbuild.mjs (header comment) and WIP.Harness.md, "Do not reach for --buildAndExit32 instead": when fixed, those two say the switch is unusable. So do docs/Documentation/Tools.md (the tbbuild section) and docs/Features/Packages/Import-export tool.md ("Compiling from the command line"). All four say exit 0 only for an error in code nothing calls, and a hang for an error the build reaches. -->
 
 ---
 
@@ -814,7 +818,7 @@ Each build writes its type library and succeeds, however many IDEs share the `TE
 **Additional context**
 Severity: low; the build passes when repeated, and an IDE run by a person rarely builds at the same moment as another. It affects tools that build several projects at once. The compiler imports `GetTempFileNameW`, and its messages show that it writes the type library to a file and reads it back (`[TYPELIB] failed to read in generated type library file` is the message beside this one). A temporary file name that two processes both use would explain the counts; that is an inference, not observed. The temp folder is empty after the builds, so whatever is written there is deleted.
 
-<!-- Reproducer: bugs/concurrent-builds-shared-temp/ (mode manual: it needs several IDEs at once, which bug_repro cannot run). The measurement used the same console template with check_examples' two staging modules, not this reproducer itself: a Sonnet agent's 904 builds through tbbuild-style lanes, data in %TEMP%/claude/typelib-probe/results.jsonl (not kept), 2026-10-02, BETA 995 only; no 983 control. scripts/lib/tb-ide.mjs's launchIde gives every IDE %TEMP%/tbbuild-tmp-<port> since 7a716388, so no harness of this repository reproduces it today: to measure it again, pass TEMP and TMP to launchIde's env. When fixed, the comment in launchIde and WIP.ExamplesBuild.md's per-IDE temp folder note may say so; the folders can stay. -->
+<!-- Reproducer: bugs/concurrent-builds-shared-temp/ (mode probe: scripts/probe_shared_temp.mjs builds it in eight IDEs at once with one TEMP, and with --control a TEMP each; on BETA 997, 3 of 8 failed in the first round shared, 0 of 48 with a TEMP each). The first measurement used the same console template with check_examples' two staging modules, not this reproducer itself: a Sonnet agent's 904 builds through tbbuild-style lanes, data in %TEMP%/claude/typelib-probe/results.jsonl (not kept), 2026-10-02, BETA 995 only; no 983 control. scripts/lib/tb-ide.mjs's launchIde gives every IDE %TEMP%/tbbuild-tmp-<port> since 7a716388, so no harness of this repository reproduces it today: to measure it again, pass TEMP and TMP to launchIde's env. When fixed, the comment in launchIde and WIP.ExamplesBuild.md's per-IDE temp folder note may say so; the folders can stay. -->
 
 ---
 
@@ -1770,7 +1774,7 @@ The workaround is step 5's: an inline handler that calls the function `AddEventL
 
 Severity: low. A workaround exists, but nothing tells the add-in's author why the listener is not called: the exception shows only in the IDE's own page.
 
-<!-- Reproducer: bugs/raiseevent-plain-html-typeerror/ (mode manual: an add-in has to be built into an IDE's add-in folder, which nothing here may do outside a lane). Asserted by `addin-test.bat --only panes` (test/addin/panes.test.mjs, "P12: raiseEvent from plain tool-window HTML throws, and the add-in hears nothing", and the direct call after it), which passes on BETA 995 and 997. The reproducer is a cut-down copy of that lane's PanesProbe add-in (test/addin/probes/panes), compiled clean on 997 by `bug_repro.mjs compile`, and not itself run in a lane. The raiseEvent source quoted is from BETA 997's ide/main.js. Stated in docs/Reference/Built-In/tbIDE/HtmlElement.md, the NOTE under "raiseEvent" (names BETA 997), and in WIP.HelpAddin.md (P12): when fixed, update that test and P12, and state in the NOTE what raiseEvent does in plain HTML, with no mention of the defect. -->
+<!-- Reproducer: bugs/raiseevent-plain-html-typeerror/ (mode lane: an add-in has to be built into an IDE's add-in folder, which nothing here may do outside a lane, so `verify` runs the lane). Asserted by `addin-test.bat --only panes` (test/addin/panes.test.mjs, "P12: raiseEvent from plain tool-window HTML throws, and the add-in hears nothing", and the direct call after it), which passes on BETA 995 and 997. The reproducer is a cut-down copy of that lane's PanesProbe add-in (test/addin/probes/panes), compiled clean on 997 by `bug_repro.mjs compile`, and not itself run in a lane. The raiseEvent source quoted is from BETA 997's ide/main.js. Stated in docs/Reference/Built-In/tbIDE/HtmlElement.md, the NOTE under "raiseEvent" (names BETA 997), and in WIP.HelpAddin.md (P12): when fixed, update that test and P12, and state in the NOTE what raiseEvent does in plain HTML, with no mention of the defect. -->
 
 ---
 
@@ -1813,4 +1817,4 @@ Only `onclick` was tried. The setter's test is on the name, so it applies to eve
 
 Severity: low. `AddEventListener` and inline handlers work, but an add-in that sets a handler property gets neither the handler nor an error.
 
-<!-- Reproducer: bugs/on-property-ignored/ (mode manual: an add-in has to be built into an IDE's add-in folder, which nothing here may do outside a lane). Asserted by `addin-test.bat --only panes` (test/addin/panes.test.mjs, 'P4: a property whose name starts with "on" is dropped, and the add-in is told nothing'), which passes on BETA 995 and 997. The reproducer is a cut-down copy of that lane's PanesProbe add-in (test/addin/probes/panes), compiled clean on 997 by `bug_repro.mjs compile`, and not itself run in a lane. The setter source quoted is from BETA 997's ide/main.js. Stated in docs/Reference/Built-In/tbIDE/HtmlElementProperties.md, the NOTE that begins "A property whose name starts with `on` is ignored" (names BETA 997), and in WIP.HelpAddin.md (P4): when fixed, update that test and P4, and remove the NOTE or replace it with what the setter now does. -->
+<!-- Reproducer: bugs/on-property-ignored/ (mode lane: an add-in has to be built into an IDE's add-in folder, which nothing here may do outside a lane, so `verify` runs the lane). Asserted by `addin-test.bat --only panes` (test/addin/panes.test.mjs, 'P4: a property whose name starts with "on" is dropped, and the add-in is told nothing'), which passes on BETA 995 and 997. The reproducer is a cut-down copy of that lane's PanesProbe add-in (test/addin/probes/panes), compiled clean on 997 by `bug_repro.mjs compile`, and not itself run in a lane. The setter source quoted is from BETA 997's ide/main.js. Stated in docs/Reference/Built-In/tbIDE/HtmlElementProperties.md, the NOTE that begins "A property whose name starts with `on` is ignored" (names BETA 997), and in WIP.HelpAddin.md (P4): when fixed, update that test and P4, and remove the NOTE or replace it with what the setter now does. -->
diff --git a/WIP.md b/WIP.md
index e5cf41970..4f5081028 100644
--- a/WIP.md
+++ b/WIP.md
@@ -462,7 +462,7 @@ Why the report separates the wedged task from the merely blocked ones, and why
 - `ide-test.bat` --- the same runner for scenarios that operate the IDE itself rather than an add-in: every lane in `test/ide/lanes.mjs`, base port 9660. Same exit codes, same standing outside every gate and outside CI, same rules.
 - `try-help-addin.bat` --- opens one IDE on the user's desktop with the help add-in built and loaded, to try it by hand, and puts the registry back once it is closed (see [Driving the twinBASIC compiler](#driving-the-twinbasic-compiler)). Needs `build.bat` first. Exit 0 closed and put back, 1 the add-in or the project did not compile, 2 the tool could not run, 3 not put back.
 - `node scripts/build_help_archive.mjs` --- writes `add-in/Resources/HELP/site.zip` from `docs/_site-offline` (refusing a stale tree) and reads it back to verify it. The help add-in embeds it as a resource and serves the pages from it with its own server; a build of the add-in without it uses the live site. The file is gitignored (about 21 MB), so a build of the add-in from a clean clone is the online one; run `build.bat` and then this to get the offline one. The zip's format is fixed by the add-in's reader, which does no inflating ([WIP.HelpAddin.md](WIP.HelpAddin.md), Stage 4, increment 5).
-- `node scripts/bug_repro.mjs` --- the reproducer projects under `bugs/<slug>/` for the entries of [BUGS-TO-REPORT.md](BUGS-TO-REPORT.md): `new`, `pack` (impexp, then the zip, written in Node), `compile`, `build` and `run` through `tbbuild` and `tbrun`, `vb6` (builds the optional `vb6/` VB6 project beside the twinBASIC one in a temp copy, runs its exe on a private desktop, and prints its `out.txt`; a project with a form or a user control is built without Unattended Execution, which VB6 refuses for it; `pack` zips its sources into `<slug>-vb6.zip`; VB6 is started only by `scripts/lib/vb6.mjs`, never from a shell; a graphical defect's `images` key makes `run` and `vb6` keep what the `PngDump` modules of `test/repro-templates/png/` draw as `images/<name>-tb.png` and `-vb6.png`, with a `-compare.png` of both, tested by `test/png.test.mjs`), `file` (moves a filed entry and its reproducer to `bugs/filed/<slug>/`; `file --marked` does every marked entry), and `verify`, which reads each `bugs/*/repro.json` and `bugs/filed/*/repro.json` and says whether the bug still reproduces on the newest beta. It has no wrapper. **`verify` is run by a person only**, never by a gate or CI: it needs a twinBASIC install, like `examples.bat`. Default port 9440, and `--jobs N` takes N ports from there. Its command-line cases are in `scripts/lib/cli-cases.mjs`, and need no IDE.
+- `node scripts/bug_repro.mjs` --- the reproducer projects under `bugs/<slug>/` for the entries of [BUGS-TO-REPORT.md](BUGS-TO-REPORT.md): `new`, `pack` (impexp, then the zip, written in Node), `compile`, `build` and `run` through `tbbuild` and `tbrun`, `vb6` (builds the optional `vb6/` VB6 project beside the twinBASIC one in a temp copy, runs its exe on a private desktop, and prints its `out.txt`; a project with a form or a user control is built without Unattended Execution, which VB6 refuses for it; `pack` zips its sources into `<slug>-vb6.zip`; VB6 is started only by `scripts/lib/vb6.mjs`, never from a shell; a graphical defect's `images` key makes `run` and `vb6` keep what the `PngDump` modules of `test/repro-templates/png/` draw as `images/<name>-tb.png` and `-vb6.png`, with a `-compare.png` of both, tested by `test/png.test.mjs`), `file` (moves a filed entry and its reproducer to `bugs/filed/<slug>/`; `file --marked` does every marked entry), and `verify`, which reads each `bugs/*/repro.json` and `bugs/filed/*/repro.json` and says whether the bug still reproduces on the newest beta; a `lane` reproducer names the `ide-test` or `addin-test` lane and tests that assert its bug, which `verify` runs last through that runner, and a `probe` one a script under `scripts/`. **No reproducer should need a person at the IDE** (owner, 2026-10-05): a bug the IDE has to be operated for gets a lane test, and `manual` is left for what cannot be automated at all. It has no wrapper. **`verify` is run by a person only**, never by a gate or CI: it needs a twinBASIC install, like `examples.bat`. Default port 9440, and `--jobs N` takes N ports from there. Its command-line cases are in `scripts/lib/cli-cases.mjs`, and need no IDE.
 - `node scripts/vb6run.mjs <file | ->` and `node scripts/vb6run.mjs --docs [--only <regex>]` --- build and run VB6 code, so that what a sample prints in twinBASIC can be compared with VB6: a stand-alone file of statements or a `.bas` module, or `--docs`, which builds the documentation's `check_run` fences in VB6 and says for each whether it prints what its page says (`same`, `differs`, `not VB6`, `error`, `refused`; a `projname=` group is built as a project of its own, its `slot=file` fences translated into VB6 `.cls` and `.bas` components). It has no wrapper and is outside every gate and outside CI: it needs VB6 (`--vb6`, `VB6_EXE`, or the standard install folder). **Never start `VB6.EXE` from a shell**: in Git Bash `/make` is rewritten as a path and VB6 answers with a modal box on the desktop; the tool spawns it from Node with an argument array, and a sample that calls `MsgBox` or `InputBox` or contains `End` is refused. Its `Debug.Print` rewrite and its file translation have probes in `test/example-batches.test.mjs`, and its command-line cases are in `scripts/lib/cli-cases.mjs`; both need no VB6. What it relies on is in [WIP.ExamplesBuild.md](WIP.ExamplesBuild.md).
 
 Three generators sit outside that loop and produce committed artifacts rather than build output — none runs during a build, and none is needed for one. `python scripts/build_fonts.py` rebuilds the subset webfaces under `docs/assets/fonts/` and needs a network connection; `node scripts/build_dot_metrics.mjs` regenerates `builder/inter-metrics.json` from those webfaces and needs only a browser. See [Typography](#typography). `node scripts/build_package_api.mjs` regenerates `builder/package-api.json`, the packages' declared API that the build's symbol index (`tB/symbols.json`, for the IDE help add-in) is annotated from; it needs a twinBASIC install, so **run it when the reference is re-indexed against a newer build** and commit it with the pages. See [WIP.HelpAddin.md, Stage 3](WIP.HelpAddin.md#stage-3-the-symbol-index-generated-by-the-docs-build).
diff --git a/bugs/break-in-doevents-evaluate-crash/repro.json b/bugs/break-in-doevents-evaluate-crash/repro.json
index 20c8579e2..5ff2dcf77 100644
--- a/bugs/break-in-doevents-evaluate-crash/repro.json
+++ b/bugs/break-in-doevents-evaluate-crash/repro.json
@@ -1,4 +1,9 @@
 {
-  "mode": "manual",
+  "mode": "lane",
+  "lane": "ide:break-into",
+  "tests": [
+    "? 1 in the DEBUG CONSOLE at the first stop ends the program with an access violation",
+    "so does a watch, which the IDE evaluates at the stop"
+  ],
   "steps": "1. Open break-in-doevents-evaluate-crash.twinproj in the twinBASIC IDE and press F5. Main loops on DoEvents.\n2. Press Ctrl+Break (Run > Break). The IDE stops inside the VB package: it opens IdleMessageLoopBreak.twin under Packages/VB/Sources/SUPPORT at the procedure IdleMessageLoopBreakpoint, and CALL STACK shows IdleMessageLoopBreakpoint above Main.\n3. Type ? 1 in the DEBUG CONSOLE and press Enter.\n4. Expected: 1. Actual: the program ends, and the DEBUG CONSOLE prints (runtime error -2147467259: NATIVE EXCEPTION: ACCESS_VIOLATION) and NATIVE EXCEPTION: ACCESS_VIOLATION {unknown} [$1EBD9288:twinBASIC_win32.dll+001D9288]. The IDE stays in break mode: the yellow arrow stays on the package's line, and Stop and the step commands stay enabled. Restarting the compiler puts it right.\nThe same happens with no console line at all when any watch exists, because the IDE evaluates the watches at the stop.\nControl: F5 at that first stop stops again at once, in Main, on the line after DoEvents; ? 1 there prints 1.\nAsserted on BETA 995 by `ide-test.bat --only break-into` (the project is test/ide/probes/break-into)."
 }
diff --git a/bugs/build-and-exit-silent/repro.json b/bugs/build-and-exit-silent/repro.json
index e2887e78a..3d6533551 100644
--- a/bugs/build-and-exit-silent/repro.json
+++ b/bugs/build-and-exit-silent/repro.json
@@ -1,4 +1,9 @@
 {
-  "mode": "manual",
-  "steps": "Not automatable: --buildAndExit32 is a switch of the IDE executable twinBASIC.exe, which opens a window. 1. Pack the project (node scripts/bug_repro.mjs pack build-and-exit-silent) or unzip build-and-exit-silent.zip. 2. Open it in the IDE: 1 error, TB5079 at Startup.twin line 8. 3. Run: twinBASIC.exe --buildAndExit32 <full path>\\build-and-exit-silent.twinproj. 4. See it exit 0 after a few seconds with Build\\BuildAndExitSilent_win32.exe written, and nothing about the build on stdout or stderr. 5. Edit Main to call Unused, pack again and repeat: the command never exits and writes no .exe. End the hung IDE by its pid, never by image name."
+  "mode": "lane",
+  "lane": "ide:build-and-exit-silent",
+  "tests": [
+    "an error in a procedure nothing calls: it exits 0, writes the exe, and says nothing",
+    "an error in code the build reaches: it never exits and writes no exe"
+  ],
+  "steps": "1. Pack the project (node scripts/bug_repro.mjs pack build-and-exit-silent) or unzip build-and-exit-silent.zip. 2. Open it in the IDE: 1 error, TB5079 at Startup.twin line 8. 3. Run: twinBASIC.exe --buildAndExit32 <full path>\\build-and-exit-silent.twinproj. 4. See it exit 0 after a few seconds with Build\\BuildAndExitSilent_win32.exe written, and nothing about the build on stdout or stderr. 5. Edit Main to call Unused, pack again and repeat: the command never exits and writes no .exe. End the hung IDE by its pid, never by image name."
 }
diff --git a/bugs/clear-all-breakpoints-restart/repro.json b/bugs/clear-all-breakpoints-restart/repro.json
index 509f834dd..b6803d427 100644
--- a/bugs/clear-all-breakpoints-restart/repro.json
+++ b/bugs/clear-all-breakpoints-restart/repro.json
@@ -1,4 +1,8 @@
 {
-  "mode": "manual",
+  "mode": "lane",
+  "lane": "ide:breakpoints",
+  "tests": [
+    "Clear All Breakpoints is undone by a restart: the breakpoint is back, and the run stops at it"
+  ],
   "steps": "1. Open clear-all-breakpoints-restart.twinproj in the twinBASIC IDE and open Startup.twin.\n2. Put the cursor on the line marked BREAK and press F9. A breakpoint appears in the margin.\n3. Choose Debug > Clear All Breakpoints (Ctrl+Shift+F9). The breakpoint goes.\n4. Click Restart the compiler on the toolbar, and wait for the compile to end.\n5. Expected: no breakpoint. Actual: the breakpoint is back in the margin.\n6. Press F5. Expected: the DEBUG CONSOLE shows main start, the breakpoint's line and main end. Actual: the run stops at the breakpoint.\nControls: a breakpoint removed with F9 instead stays removed after a restart, and saving the project (Ctrl+S) between Clear All Breakpoints and the restart keeps them cleared. A breakpoint saved with the project survives a restart, as it should.\nAsserted on BETA 995 by `ide-test.bat --only breakpoints` (the project is test/ide/probes/breakpoints)."
 }
diff --git a/bugs/concurrent-builds-shared-temp/repro.json b/bugs/concurrent-builds-shared-temp/repro.json
index 3d06ed65d..ead9afca6 100644
--- a/bugs/concurrent-builds-shared-temp/repro.json
+++ b/bugs/concurrent-builds-shared-temp/repro.json
@@ -1,4 +1,9 @@
 {
-  "mode": "manual",
-  "steps": "Needs several IDEs building at once, which bug_repro cannot run.\n1. Unzip concurrent-builds-shared-temp.zip and copy the project into eight folders.\n2. Open each copy in its own IDE, all eight at once, with the default environment, so that all share one TEMP.\n3. Press Build in all eight at about the same time, and repeat. About one build in 24 fails with [TYPELIB] failed to finalize typelibrary.  Disk error? then [LINKER] FAILED to create type library and [BUILD] failed.\n4. Control: give each IDE a TEMP and TMP of its own; no build fails.\nMeasured on BETA 995 through the documentation's harness with TEMP shared (8 of 192 failed) and per IDE (0 of 192). launchIde gives each IDE its own TEMP today, so pass TEMP and TMP in launchIde's env to measure it again."
+  "mode": "probe",
+  "probe": ["scripts/probe_shared_temp.mjs"],
+  "expect": {
+    "exit": 1,
+    "output": ["^[1-9]\\d* of \\d+ builds failed to write the type library \\(TEMP shared\\)$"]
+  },
+  "steps": "1. Unzip concurrent-builds-shared-temp.zip and copy the project into eight folders.\n2. Open each copy in its own IDE, all eight at once, with the default environment, so that all share one TEMP.\n3. Press Build in all eight at about the same time, and repeat. About one build in 24 fails with [TYPELIB] failed to finalize typelibrary.  Disk error? then [LINKER] FAILED to create type library and [BUILD] failed.\n4. Control: give each IDE a TEMP and TMP of its own; no build fails.\nscripts/probe_shared_temp.mjs does this with a TEMP shared by eight IDEs whose builds start together, and --control with a TEMP for each. On BETA 997, 3 of 8 builds failed in the first round shared, and 0 of 48 with a TEMP each."
 }
diff --git a/bugs/console-completion-after-print/repro.json b/bugs/console-completion-after-print/repro.json
index 8ce27d68e..1fa08c1a6 100644
--- a/bugs/console-completion-after-print/repro.json
+++ b/bugs/console-completion-after-print/repro.json
@@ -1,4 +1,10 @@
 {
-  "mode": "manual",
+  "mode": "lane",
+  "lane": "ide:console-completion",
+  "tests": [
+    "? tot, with a space, opens no list",
+    "Debug.Print tot opens no list",
+    "Call Tou and total = to open no list"
+  ],
   "steps": "1. Open console-completion-after-print.twinproj in the twinBASIC IDE, put a breakpoint on the line marked BREAK (F9) and press F5. The run stops there, with total and items, locals of Main, in scope.\n2. Click in the DEBUG CONSOLE's input and type ? tot.\n3. Expected: the IntelliSense list opens with total in it, as it does for ?tot. Actual: no list opens at any key, and Ctrl+Space at the end of the line opens none either.\n4. Replace the line with ?tot, with no space, or with tot alone: the list opens at the t, and offers total.\nThe same: Debug.Print tot opens no list; Touch tot, a Sub call's argument, opens it; ? items. opens it with the Collection's members.\nAsserted on BETA 995 and 987 by `ide-test.bat --only console-completion` (the project is test/ide/probes/console-completion)."
 }
diff --git a/bugs/console-space-accepts-completion/repro.json b/bugs/console-space-accepts-completion/repro.json
index 296027be6..4256174df 100644
--- a/bugs/console-space-accepts-completion/repro.json
+++ b/bugs/console-space-accepts-completion/repro.json
@@ -1,4 +1,11 @@
 {
-  "mode": "manual",
+  "mode": "lane",
+  "lane": "ide:console-space",
+  "tests": [
+    "Print total becomes Printertotal, which the console refuses",
+    "Call Touch(total) becomes CallByDispId(Touch(total)), which the console refuses",
+    "Set obj = items becomes SetAttr(obj = items), which the console refuses",
+    "with no program running, Print 1 + 1 becomes Printer1 + 1"
+  ],
   "steps": "1. Open console-space-accepts-completion.twinproj in the twinBASIC IDE, put a breakpoint on the line marked BREAK (F9) and press F5. The run stops there, with total, items and obj, locals of Main, in scope.\n2. Click in the DEBUG CONSOLE's input and type Print total at an ordinary speed.\n3. Expected: the line stays Print total, and Enter prints 5. Actual: the IntelliSense list opens as Print is typed, and the space after it writes the list's first entry, Printer, over Print and is lost; the line becomes Printertotal, and Enter prints (compile error: Unrecognized symbol 'Printertotal').\n4. The same: Call Touch(total) becomes CallByDispId(Touch(total)), and Set obj = items becomes SetAttr(obj = items). Escape before the space keeps the line as typed.\nAsserted on BETA 995 and 987 by `ide-test.bat --only console-space` (the project is test/ide/probes/console-space)."
 }
diff --git a/bugs/export-stops-at-readonly-file/repro.json b/bugs/export-stops-at-readonly-file/repro.json
index 9160f8487..b15815e0d 100644
--- a/bugs/export-stops-at-readonly-file/repro.json
+++ b/bugs/export-stops-at-readonly-file/repro.json
@@ -1,4 +1,8 @@
 {
-  "mode": "manual",
+  "mode": "lane",
+  "lane": "ide:export",
+  "tests": [
+    "a read-only file stops the export part-way, and the IDE reports nothing"
+  ],
   "steps": "Do it in a scratch folder made for this, <S> below (for example C:\\Scratch\\readonly-test). File > Export Project empties <S>\\export.\n1. Unzip export-stops-at-readonly-file.zip into <S>, so that <S>\\export-stops-at-readonly-file.twinproj exists.\n2. In a Command Prompt: mkdir <S>\\export, then make three files in it, a-first.txt, m-readonly.txt and z-last.txt (echo x> <S>\\export\\a-first.txt, and so on), and attrib +R <S>\\export\\m-readonly.txt.\n3. Open the project in the twinBASIC IDE. Its Export Path is ${SourcePath}\\export and Export Verbose is on (Project Settings, Export).\n4. Choose File > Export Project.\n5. See, as the last three lines of the DEBUG CONSOLE: [EXPORT]  DELETE FAILED: \\\\?\\<S>\\export\\m-readonly.txt, [EXPORT]  ERROR: unable to clean the output folder and [EXPORT] export failed. No dialog opens. <S>\\export holds m-readonly.txt and z-last.txt: a-first.txt, which sorts before the read-only file, is deleted, and nothing was exported.\n6. Afterwards: attrib -R <S>\\export\\m-readonly.txt.\nRe-measured on BETA 995 by `ide-test.bat --only export`."
 }
diff --git a/bugs/filed/addin-shortcut-ctrl-alt/repro.json b/bugs/filed/addin-shortcut-ctrl-alt/repro.json
index 5f7044793..65a8d5ee5 100644
--- a/bugs/filed/addin-shortcut-ctrl-alt/repro.json
+++ b/bugs/filed/addin-shortcut-ctrl-alt/repro.json
@@ -1,5 +1,10 @@
 {
-  "mode": "manual",
+  "mode": "lane",
+  "lane": "addin:keys",
+  "tests": [
+    "P1: Ctrl and Alt keys do not fire",
+    "P1: a Ctrl or Alt key fires when the same key was pressed alone just before"
+  ],
   "steps": "This is an add-in project: building it makes a DLL that the IDE's compiler loads on every start until the DLL is removed. Install it knowingly, in an IDE you can restart, and remove it afterwards.\n1. Open addin-shortcut-ctrl-alt.twinproj and build it for Win32. The DLL is written to Build\\AddinShortcutCtrlAlt_win32.dll beside the project file. Close the IDE, copy the DLL into the IDE's addins\\win32 folder (beside twinBASIC.exe), and start the IDE again. Open any project: the DEBUG CONSOLE shows [KeysProbe] registered.\n2. With no text box focused (click an empty part of the toolbar), press, one at a time and a second apart: D, Shift+D, F1, Shift+F1. Each prints [KeysProbe] fired <key string>, as d, {shift}d, f1 and {shift}f1.\n3. Press Ctrl+Shift+D, Ctrl+D and Alt+F, a second apart. Nothing is printed for any of them, although the add-in registered {CTRL}{SHIFT}d, {ctrl}d and {ALT}f.\n4. Press D, then within half a second Ctrl+D, Ctrl+Shift+D, then F and Alt+F: now all of them print.\n5. Remove the add-in: close the IDE and delete addins\\win32\\AddinShortcutCtrlAlt_win32.dll.\nRe-measured on BETA 995 by `addin-test.bat --only keys` (the project is test/addin/probes/keys; the lane builds it into a private copy of the install and presses the keys as CDP key events).",
   "issue": 2445
 }
diff --git a/bugs/filed/export-path-sourcepath-as-path/repro.json b/bugs/filed/export-path-sourcepath-as-path/repro.json
index bd9dc59c5..06e4306ed 100644
--- a/bugs/filed/export-path-sourcepath-as-path/repro.json
+++ b/bugs/filed/export-path-sourcepath-as-path/repro.json
@@ -1,5 +1,9 @@
 {
-  "mode": "manual",
+  "mode": "lane",
+  "lane": "ide:export",
+  "tests": [
+    "an export into the project's own folder deletes the project file"
+  ],
   "steps": "WARNING: this deletes the project file. Do it in a scratch folder made for this, <S> below (for example C:\\Scratch\\sourcepath-test), holding nothing but the unzipped project.\n1. Unzip export-path-sourcepath-as-path.zip into <S>, so that <S>\\export-path-sourcepath-as-path.twinproj is the only file there. Open it in the twinBASIC IDE. Export Verbose is on.\n2. Project Settings > Export > Export Path: type ${SourcePath}. The editor refuses it: \"${SourcePath} on it's own is not allowed. This would DELETE the project file ...\".\n3. Type <S> in full instead (C:\\Scratch\\sourcepath-test). The editor accepts it. Apply.\n4. Choose File > Export Project.\n5. See, in the DEBUG CONSOLE, [EXPORT]  DELETED: \\\\?\\<S>\\export-path-sourcepath-as-path.twinproj, and then [EXPORT] COMPLETED. The project file is no longer on disk; the project is still open, and Save Project would write it back.\nRe-measured on BETA 995 by `ide-test.bat --only export`, which calls exportProjectTo() on the project's own folder (the compiler's side: step 4 and 5). Step 3, that the Settings editor accepts the full path, is read from the validate() function of project.exportPath in ide/main.js, which compares the text with ${sourcepath} and ${sourcepath}\\ and does not resolve the path; it has not been tried by hand.",
   "issue": 2457
 }
diff --git a/bugs/filed/export-writes-compiler-packages/repro.json b/bugs/filed/export-writes-compiler-packages/repro.json
index 651a6d989..dff3672a3 100644
--- a/bugs/filed/export-writes-compiler-packages/repro.json
+++ b/bugs/filed/export-writes-compiler-packages/repro.json
@@ -1,5 +1,10 @@
 {
-  "mode": "manual",
+  "mode": "lane",
+  "lane": "ide:export",
+  "tests": [
+    "an export into an empty folder writes the compiler packages",
+    "the command line's import refuses the IDE's export, for its compiler packages"
+  ],
   "steps": "Do it in a scratch folder made for this, <S> below (for example C:\\Scratch\\packages-test). File > Export Project empties <S>\\export.\n1. Unzip export-writes-compiler-packages.zip into <S>, so that <S>\\export-writes-compiler-packages.twinproj exists. In a Command Prompt: mkdir <S>\\export.\n2. Open the project in the twinBASIC IDE. Its Export Path is ${SourcePath}\\export. Choose File > Export Project.\n3. See <S>\\export\\Packages: it holds the source of the compiler packages the project uses, VB, VBA, VBRUN and AppGlobalClassProject (475 of the 477 files an export of a two-file project wrote). The project file holds none of them.\n4. In a Command Prompt, with <IDE> the folder that holds twinBASIC.exe: \"<IDE>\\bin\\twinBASIC_win32.exe\" import <S>\\repacked.twinproj <S>\\export\\ --overwrite. It stops with exit code 999 and writes nothing.\n5. Control: \"<IDE>\\bin\\twinBASIC_win32.exe\" export <S>\\export-writes-compiler-packages.twinproj <S>\\fromfile\\ --overwrite writes 3 files, Settings and the two sources, and an empty Packages folder, because the project file holds no package.\nRe-measured on BETA 995 by `ide-test.bat --only export` (steps 2 to 4).",
   "issue": 841,
   "existing": true
diff --git a/bugs/filed/stop-at-error-ends-procedure/repro.json b/bugs/filed/stop-at-error-ends-procedure/repro.json
index c74db8c9b..5db08cd39 100644
--- a/bugs/filed/stop-at-error-ends-procedure/repro.json
+++ b/bugs/filed/stop-at-error-ends-procedure/repro.json
@@ -1,5 +1,10 @@
 {
-  "mode": "manual",
+  "mode": "lane",
+  "lane": "ide:debugger",
+  "tests": [
+    "the panel's Stop ends only the failing procedure: Main goes on",
+    "the Stop command, as the toolbar and Run > End give it, does the same"
+  ],
   "steps": "1. Open stop-at-error-ends-procedure.twinproj in the twinBASIC IDE and press F5. FillTable raises an error at the line marked FAILS and the error panel opens. The DEBUG CONSOLE shows main start and loop 0.\n2. In the error panel choose Stop (or the toolbar's Stop, or Run > End).\n3. Expected: the run ends, and nothing more is printed. Actual: FillTable ends, and Main goes on: the DEBUG CONSOLE shows main after call.\n4. A failed assertion: in Main, change the call FillTable to TestPadLeft, press F5, and at the error panel (Assert.Exact.AreEqual raised it) choose Stop, or Run > End. TestPadLeft carries on past the failed assertion (test after assert) and Main prints main after call.\nControl: Stop at an ordinary break, such as a breakpoint or a step, ends the whole run and prints aborted.\nRe-measured on BETA 995 by `ide-test.bat --only debugger` and `--only assert` (the projects are test/ide/probes/debugger and assert); both pass on BETA 983 too.",
   "issue": 2441
 }
diff --git a/bugs/filed/toolwindow-no-id/repro.json b/bugs/filed/toolwindow-no-id/repro.json
index 0d7cbc4b9..91e37aa1c 100644
--- a/bugs/filed/toolwindow-no-id/repro.json
+++ b/bugs/filed/toolwindow-no-id/repro.json
@@ -1,5 +1,9 @@
 {
-  "mode": "manual",
+  "mode": "lane",
+  "lane": "addin:panes",
+  "tests": [
+    "ToolWindows.Add: two windows given no id are one window, emptied by the second Add"
+  ],
   "steps": "This is an add-in project: building it makes a DLL that the IDE's compiler loads on every start until the DLL is removed. Install it knowingly, in an IDE you can restart, and remove it afterwards.\n1. Open toolwindow-no-id.twinproj and build it for Win32. The DLL is written to Build\\ToolwindowNoId_win32.dll beside the project file. Close the IDE, copy the DLL into the IDE's addins\\win32 folder (beside twinBASIC.exe), and start the IDE again. Open any project: the toolbar has a button, No id windows.\n2. Click the button. The add-in adds two tool windows, \"Window one\" and \"Window two\", with no id, and then adds a third element to the first.\n3. See one tool window, titled NO ID 2, holding the elements noid2 (\"second\") and noid1again (\"first again\"). The first window is gone, and what was added through its ToolWindow object went into the second window.\n4. Remove the add-in: close the IDE and delete addins\\win32\\ToolwindowNoId_win32.dll.\nRe-measured on BETA 995 by `addin-test.bat --only panes` (the last test; its add-in is test/addin/probes/panes, whose third button runs the same code).",
   "issue": 2449
 }
diff --git a/bugs/filed/typing-after-open-reversed/REPORT.md b/bugs/filed/typing-after-open-reversed/REPORT.md
index 1fd08407b..6291771b7 100644
--- a/bugs/filed/typing-after-open-reversed/REPORT.md
+++ b/bugs/filed/typing-after-open-reversed/REPORT.md
@@ -32,4 +32,4 @@ Found by the add-in test harness: `MsgBox(`, typed into the code editor just aft
 
 BETA 995 was not measured: no lane exercises it. `parseDocumentDecorations` and `revealLineInEditor` are unchanged in BETA 995's `ide/main.js` (the `revealedLineTime<700` test was read again), and the test harness, which runs on BETA 995, still has to wait out the 700 ms before it places a cursor.
 
-<!-- The harness waits it out with `afterReveal` in scripts/lib/tb-operate.mjs, used by openFile, setCursor and select; the keys and symbols lanes pass on BETA 995 through it. No test asserts the bug itself. The reproducer is the lane's host project (test/addin/host) with header comments; Haystack.twin's first line is a comment, so the line numbers above stay as in the entry. Measured with `openEditors.openFile(node,false,false,false,4,9)` over DevTools. To make it assertable: a lane test in test/addin that opens Haystack.twin at 4:9, types without afterReveal, and reads the text. When fixed: remove the wait from `afterReveal` and its comment. -->
+<!-- The harness waits it out with `afterReveal` in scripts/lib/tb-operate.mjs, used by openFile, setCursor and select; the keys and symbols lanes pass on BETA 995 through it. Asserted by `ide-test.bat --only typing-after-open` (test/ide/typing-after-open.test.mjs, with a control), which passes on BETA 997; repro.json is in lane mode, so `verify` runs it. The reproducer is the lane's host project (test/addin/host) with header comments; Haystack.twin's first line is a comment, so the line numbers above stay as in the entry. When fixed: remove the wait from `afterReveal` and its comment. -->
diff --git a/bugs/filed/typing-after-open-reversed/repro.json b/bugs/filed/typing-after-open-reversed/repro.json
index 6d52d4b2f..948097d1e 100644
--- a/bugs/filed/typing-after-open-reversed/repro.json
+++ b/bugs/filed/typing-after-open-reversed/repro.json
@@ -1,5 +1,10 @@
 {
-  "mode": "manual",
-  "steps": "Measured by a script, not by hand: a person has to type without a pause of 0.7 s, which is hard to time.\n1. Open typing-after-open-reversed.twinproj in the twinBASIC IDE, with Haystack.twin not open in an editor tab.\n2. Open Haystack.twin at line 4, column 9 the way Find in Files does: in the page, openEditors.openFile(node, false, false, false, 4, 9), with node the file's entry in the project tree. By hand: Find in Files for \"Dim needleCount\" (one match, at line 4, column 9), and double-click the result.\n3. 0.3 s later move the cursor to line 3, column 1, and type xyz, one key every 150 ms.\n4. Expected: line 3 starts with xyz. Actual: line 3 starts with x, and line 4 reads \"        zyDim needleCount As Long\".\nControl: the same typing started more than 0.7 s after the file opened puts xyz at 3:1 in order.\nBETA 983 only: no lane measures it on BETA 995. In BETA 995's ide/main.js, parseDocumentDecorations still ends with if(performance.now()-revealedLineTime<700){revealLineInEditor(...)}, and the test harness (afterReveal in scripts/lib/tb-operate.mjs, used by the keys and symbols lanes on 995) still has to wait out that time before it places a cursor.",
+  "mode": "lane",
+  "lane": "ide:typing-after-open",
+  "tests": [
+    "typing begun 0.3 s after a file opens at a line is reordered by the re-reveal",
+    "the same typing begun 1 s after the file opens puts xyz at the start of the line in order"
+  ],
+  "steps": "Measured by a script, not by hand: a person has to type without a pause of 0.7 s, which is hard to time.\n1. Open typing-after-open-reversed.twinproj in the twinBASIC IDE, with Haystack.twin not open in an editor tab.\n2. Open Haystack.twin at line 4, column 9 the way Find in Files does: in the page, openEditors.openFile(node, false, false, false, 4, 9), with node the file's entry in the project tree. By hand: Find in Files for \"Dim needleCount\" (one match, at line 4, column 9), and double-click the result.\n3. 0.3 s later move the cursor to line 3, column 1, and type xyz, one key every 150 ms.\n4. Expected: line 3 starts with xyz. Actual: line 3 starts with x, and line 4 reads \"        zyDim needleCount As Long\".\nControl: the same typing started more than 0.7 s after the file opened puts xyz at 3:1 in order.\nAsserted on BETA 997 by ide-test.bat --only typing-after-open, with the control.",
   "issue": 2447
 }
diff --git a/bugs/import-package-unticked/repro.json b/bugs/import-package-unticked/repro.json
index 2d924c7b7..aaf1df29e 100644
--- a/bugs/import-package-unticked/repro.json
+++ b/bugs/import-package-unticked/repro.json
@@ -1,5 +1,11 @@
 {
-  "mode": "manual",
-  "attach": ["DocProbePkg.twinpack"],
+  "mode": "lane",
+  "lane": "ide:packages",
+  "tests": [
+    "the imported package is listed, but not ticked"
+  ],
+  "attach": [
+    "DocProbePkg.twinpack"
+  ],
   "steps": "1. Unzip import-package-unticked.zip (attached to the report; pack writes it), which holds import-package-unticked.twinproj and DocProbePkg.twinpack. Open the project in the twinBASIC IDE.\n2. Open Project Settings > References > Available Packages and press Import from file...; choose DocProbePkg.twinpack.\n3. DocProbePkg appears in the Available Packages list, unticked. The compiler has answered the importPackage request with success: true and body: { packageSymbol: \"DocProbePkg\" }, so the import worked. Expected: the package is ticked, as after the online import. Actual: nothing in the project can use it until it is ticked by hand.\nRe-measured on BETA 995 by `ide-test.bat --only packages` (first test; its probe is test/ide/probes/packages); BETA 983 by hand. The lane has no native file picker, so it answers the dialog's OpenPackage call itself; the click on the button is real."
 }
diff --git a/bugs/on-property-ignored/repro.json b/bugs/on-property-ignored/repro.json
index beb5a0133..312335325 100644
--- a/bugs/on-property-ignored/repro.json
+++ b/bugs/on-property-ignored/repro.json
@@ -1,4 +1,8 @@
 {
-  "mode": "manual",
+  "mode": "lane",
+  "lane": "addin:panes",
+  "tests": [
+    "P4: a property whose name starts with \"on\" is dropped, and the add-in is told nothing"
+  ],
   "steps": "1. Open on-property-ignored.twinproj in the twinBASIC IDE and build it (win32). Copy Build\\OnPropertyIgnored_win32.dll into %APPDATA%\\twinBASIC\\addins\\win32\\, restart the IDE and open any project.\n2. Click the toolbar button on property repro. A tool window opens with [property] and [inline], and the DEBUG CONSOLE prints onclick set, error 0.\n3. Click [property]. Expected: its text changes to clicked, or step 2 raised an error. Actual: nothing happens; the element has no onclick handler and no onclick attribute.\n4. Control: click [inline]. Its text changes to clicked.\nAsserted on BETA 995 and 997 by `addin-test.bat --only panes` (P4, the PanesProbe add-in in test/addin/probes/panes, of which this project is a cut-down copy)."
 }
diff --git a/bugs/raiseevent-plain-html-typeerror/repro.json b/bugs/raiseevent-plain-html-typeerror/repro.json
index 3cc49d720..e5b9efb2e 100644
--- a/bugs/raiseevent-plain-html-typeerror/repro.json
+++ b/bugs/raiseevent-plain-html-typeerror/repro.json
@@ -1,4 +1,8 @@
 {
-  "mode": "manual",
+  "mode": "lane",
+  "lane": "addin:panes",
+  "tests": [
+    "P12: raiseEvent from plain tool-window HTML throws, and the add-in hears nothing"
+  ],
   "steps": "1. Open raiseevent-plain-html-typeerror.twinproj in the twinBASIC IDE and build it (win32). Copy Build\\RaiseeventPlainHtmlTypeerror_win32.dll into %APPDATA%\\twinBASIC\\addins\\win32\\, restart the IDE and open any project.\n2. Click the toolbar button raiseEvent repro. A tool window opens with [raise] and [direct].\n3. Click [raise]. Expected: the DEBUG CONSOLE prints myEvent from raise. Actual: nothing is printed, and the IDE's page has an uncaught TypeError: Cannot read properties of null (reading 'rootEventHandler').\n4. Control: click [direct]. The DEBUG CONSOLE prints myEvent from direct.\nAsserted on BETA 995 and 997 by `addin-test.bat --only panes` (P12, the PanesProbe add-in in test/addin/probes/panes, of which this project is a cut-down copy)."
 }
diff --git a/bugs/recent-projects-copies/repro.json b/bugs/recent-projects-copies/repro.json
index 8859c0424..15ebbced9 100644
--- a/bugs/recent-projects-copies/repro.json
+++ b/bugs/recent-projects-copies/repro.json
@@ -1,4 +1,8 @@
 {
-  "mode": "manual",
-  "steps": "Not automatable: it changes HKCU\\Software\\VB and VBA Program Settings\\twinBASIC_IDE\\RecentlyOpened, the person's own list. Export that key first with reg export, and import it back afterwards. 1. Copy recent-projects-copies.twinproj to A.twinproj, B.twinproj and C.twinproj. 2. In RecentlyOpened leave \"0\" = A.twinproj and \"1\" = B.twinproj, and delete \"2\" to \"20\" or set them to empty strings. 3. Open C.twinproj (twinBASIC.exe C.twinproj is enough). 4. Read the values: \"0\" is C, \"1\" is A and \"2\" to \"20\" are all B.twinproj, nineteen copies."
+  "mode": "lane",
+  "lane": "ide:recent-projects-copies",
+  "tests": [
+    "opening a project fills the slots that held nothing with copies of the last entry"
+  ],
+  "steps": "It changes HKCU\\Software\\VB and VBA Program Settings\\twinBASIC_IDE\\RecentlyOpened, the person's own list. Export that key first with reg export, and import it back afterwards. 1. Copy recent-projects-copies.twinproj to A.twinproj, B.twinproj and C.twinproj. 2. In RecentlyOpened leave \"0\" = A.twinproj and \"1\" = B.twinproj, and delete \"2\" to \"20\" or set them to empty strings. 3. Open C.twinproj (twinBASIC.exe C.twinproj is enough). 4. Read the values: \"0\" is C, \"1\" is A and \"2\" to \"20\" are all B.twinproj, nineteen copies."
 }
diff --git a/bugs/replace-embedded-package-one-apply/repro.json b/bugs/replace-embedded-package-one-apply/repro.json
index 41bc11334..320e8e97d 100644
--- a/bugs/replace-embedded-package-one-apply/repro.json
+++ b/bugs/replace-embedded-package-one-apply/repro.json
@@ -1,5 +1,12 @@
 {
-  "mode": "manual",
-  "attach": ["DocProbePkg-v1.twinpack", "DocProbePkg-v2.twinpack"],
+  "mode": "lane",
+  "lane": "ide:packages",
+  "tests": [
+    "one Apply after the untick, the import and the tick: no restart, no save, and v1 still runs"
+  ],
+  "attach": [
+    "DocProbePkg-v1.twinpack",
+    "DocProbePkg-v2.twinpack"
+  ],
   "steps": "Use a machine with no copy of DocProbePkg in %APPDATA%\\twinBASIC\\packages (a linked copy makes the bug go away).\n1. Unzip replace-embedded-package-one-apply.zip (attached; pack writes it), which holds replace-embedded-package-one-apply.twinproj, DocProbePkg-v1.twinpack and DocProbePkg-v2.twinpack, whose function DocProbeVersion returns 1 and 2. Open the project.\n2. Embed v1: Project Settings > References > Available Packages > Import from file... DocProbePkg-v1.twinpack, tick it, Apply. Replace the body of Main with Debug.Print \"DocProbeVersion=\" & DocProbeVersion(), and press F5: the DEBUG CONSOLE shows DocProbeVersion=1.\n3. Replace it with v2 under ONE Apply: in References untick DocProbePkg, then Available Packages > Import from file... DocProbePkg-v2.twinpack, tick it, and press Apply once.\n4. See, in the DEBUG CONSOLE, only [COMPILER] Project settings updated: no compiler restart and no save. Press F5: it prints DocProbeVersion=1. Expected: 2.\nControl: Apply after the untick, and again after the import and tick: each Apply restarts the compiler and saves, and F5 prints DocProbeVersion=2.\nRe-measured on BETA 995 by `ide-test.bat --only packages` (the second and third tests, with the control; probes in test/ide/probes/packages)."
 }
diff --git a/bugs/step-key-leaves-step-pending/repro.json b/bugs/step-key-leaves-step-pending/repro.json
index dcd9c128a..76964abee 100644
--- a/bugs/step-key-leaves-step-pending/repro.json
+++ b/bugs/step-key-leaves-step-pending/repro.json
@@ -1,4 +1,8 @@
 {
-  "mode": "manual",
+  "mode": "lane",
+  "lane": "ide:debugger",
+  "tests": [
+    "after F8 there, Ignore stops on the next line instead of running on"
+  ],
   "steps": "1. Open step-key-leaves-step-pending.twinproj in the twinBASIC IDE and press F5. FillTable raises an error at the line marked FAILS (subscript out of range) and the error panel opens. The DEBUG CONSOLE shows main start and loop 0.\n2. Press F8 on that line. The line runs again, the error recurs and the mark does not move: as expected.\n3. In the error panel choose Ignore (Resume Next).\n4. Expected: the program runs on from the next line. Actual: it stops at the next line, Debug.Print \"after fail \" & i, and has not printed after fail 0.\n5. Press F5. It does not run on from there: it runs to the loop's next error, so the DEBUG CONSOLE now ends with after fail 0 and loop 1, and the error panel is open again. The step F8 asked for was used up by that one stop.\nControl: restart, and choose Ignore (Resume Next) without pressing F8 first: it runs on from the next line, to the next pass's error.\nRe-measured on BETA 995 by `ide-test.bat --only debugger` (the project is test/ide/probes/debugger). The same on BETA 983."
 }
diff --git a/bugs/udt-watch-codegen-error/repro.json b/bugs/udt-watch-codegen-error/repro.json
index 5effeb9a4..8e38054d3 100644
--- a/bugs/udt-watch-codegen-error/repro.json
+++ b/bugs/udt-watch-codegen-error/repro.json
@@ -1,4 +1,10 @@
 {
-  "mode": "manual",
+  "mode": "lane",
+  "lane": "ide:watches",
+  "tests": [
+    "a watch on p fails with a codegen error, and the console reports a linker error",
+    "the next stop reports the linker error again",
+    "? p in the DEBUG CONSOLE fails the same way"
+  ],
   "steps": "1. Open udt-watch-codegen-error.twinproj in the twinBASIC IDE, put a breakpoint on the line marked BREAK (F9) and press F5. The run stops there; VARIABLES shows p as {user defined type, 8 bytes}, with X and Y.\n2. Add a watch on p (Debug > Add Watch..., or the plus sign in WATCHES).\n3. Expected: the watch shows p as VARIABLES does. Actual: its value is (compile error: codegen error; check for compilation errors) and its type ERROR, and the DEBUG CONSOLE prints [LINKER] compilation (codegen) error detected in 'Startup.{temp_procedure}' at line #1.\n4. Press F5. The run stops at the breakpoint again, on the loop's second pass, and the DEBUG CONSOLE prints the linker error again: it does so at every stop while the watch is there.\n5. Type ? p in the DEBUG CONSOLE and press Enter: the same error, and the same linker line.\nControl: a watch on p.X shows 7, of type Variant [Long].\nAsserted on BETA 995 by `ide-test.bat --only watches` (the project is test/ide/probes/watches)."
 }
diff --git a/docs/Documentation/Tools.md b/docs/Documentation/Tools.md
index 1ca7c2b0d..cd15a8402 100644
--- a/docs/Documentation/Tools.md
+++ b/docs/Documentation/Tools.md
@@ -1111,18 +1111,21 @@ wrong type, is refused with exit 2, naming the file and the key, before anything
 
 | Key | Meaning |
 |---|---|
-| `mode` | `compile`, `build`, `run`, `cli` or `manual`. `manual` is a reproducer that cannot be automated, such as one that needs a click in the IDE. A `cli` or `manual` reproducer may have no `src/`, when the bug is in files the installation ships; `verify` then runs it without packing, and `{project}` and `{src}` are refused. |
+| `mode` | `compile`, `build`, `run`, `cli`, `lane`, `probe` or `manual`. `lane` is a bug that a lane of [`ide_test.mjs`](#ide-test) or [`addin_test.mjs`](#addin-test) asserts, such as one that needs a click in the IDE; `probe` is one that a script of its own measures, such as one that needs several IDEs at once; `manual` is a reproducer that only a person can run. A `cli`, `lane`, `probe` or `manual` reproducer may have no `src/`, when the bug is in files the installation ships or the lane brings its own project; `verify` then runs it without packing, and `{project}` and `{src}` are refused. |
+| `lane` | `lane` mode. `ide:<lane>` or `addin:<lane>`: the suite, and the lane's name as `--only` matches it. A lane the suite's `lanes.mjs` does not list is refused. |
+| `tests` | `lane` mode. The names of the lane's tests that pass while the bug is there, as the lane's report prints them. The reproducer reproduces when every one of them passes. |
+| `probe` | `probe` mode. A script under `scripts/`, then its arguments: `verify` runs `node <script> <arguments>` from the repository's root, adding `--ide` when it was given one, and judges the exit code and the output by `expect`. The script starts and ends what it needs itself, and must end on its own. |
 | `arch` | Optional. `win32` (default) or `win64`. |
 | `llvm` | Optional, `build` and `run`. `true` builds with LLVM. |
 | `exe` | Optional, `run` only. `true` also runs the built exe, as `run --exe` does: no probe module is added, `Sub Main` runs in the exe, and an exe that exits with a code other than 0 is `tbrun`'s exit 6. `Debug.Print` writes nothing in an exe, so what `expect.output` can match is only what `TbRun.Out` wrote; a bug that crashes the exe is expected as `"exit": 6`. |
-| `expect.exit` | The exit code of `tbbuild` or `tbrun` as they print it, not this tool's mapped code; for `cli`, the compiler executable's. |
+| `expect.exit` | The exit code of `tbbuild` or `tbrun` as they print it, not this tool's mapped code; for `cli`, the compiler executable's; for `probe`, the script's. |
 | `expect.diagnostics` | `compile`. Diagnostic codes, such as `TB5182`, that must all be reported. |
 | `expect.noDiagnostics` | `compile`. `true` expects no error, warning, hint or information. |
 | `expect.message` | `build`. A regular expression the message `tbbuild` prints on standard error must match. |
-| `expect.output` | `run` and `cli`. Regular expressions, each of which must match the output. They are matched line by line, so `^` and `$` hold at each line. |
-| `expect.absent` | `run` and `cli`. Regular expressions, none of which may match the output, such as an `ERROR` line the bug's fix would print. |
+| `expect.output` | `run`, `cli` and `probe`. Regular expressions, each of which must match the output. They are matched line by line, so `^` and `$` hold at each line. |
+| `expect.absent` | `run`, `cli` and `probe`. Regular expressions, none of which may match the output, such as an `ERROR` line the bug's fix would print. |
 | `cli` | `cli` mode. The arguments for the compiler executable, `bin\twinBASIC_win32.exe`, or a list of such lists, run in turn; their output is joined, and their exit code is the one they all gave, or the codes joined by commas, such as `0,999`. `{tmp}` stands for a new temp folder, deleted afterwards; `{project}` for a copy of the packed `.twinproj` in it, and `{src}` for a copy of `src/`, so a command that writes either never touches the committed reproducer; `{ide}` for the folder of the IDE that `--ide` names or that is found, so a file the installation ships can be named without a user name. Give an output folder with backslashes and a trailing one, as `export` requires. Each command runs on a private desktop, inside a job that ends everything it starts, with its standard output and error written to files; `--timeout` (default 120 seconds) is the limit on each. The compiler opens a modal message box for some inputs, such as a damaged project, and waits for it to be closed, and on a private desktop nobody could close it. So the tool reads every dialog box a command opens, and presses its OK button, which lets the command go on. A command's output begins with one line for each box, in the order they opened, `dialog: <title>: <text>` with the box's text on one line, then its standard output, then its standard error, and `expect.output` and `expect.absent` are matched against that. |
-| `steps` | `manual`. What a person does to see the bug. `verify` prints it. |
+| `steps` | What a person does to see the bug, for the issue. `verify` prints it for a `manual` reproducer. |
 | `images` | Optional, `run` and `manual`. A non-empty list of picture names, each of letters, digits, `-` and `_`, without repeats. The project needs a `PngDump.twin` under `src/Sources/` and, when there is a `vb6/`, a `vb6/PngDump.bas` and a `Module=PngDump; PngDump.bas` line in its `Probe.vbp`; without them the file is refused. |
 | `expect.imagesDiffer` | `run`, with `images`. `true` reproduces only when at least one picture of the fresh run differs from the committed `images/<name>-vb6.png`, a difference in size counting; `false` only when all of them match. `images/<name>-vb6.png` must exist for every name, and the file is refused when one does not. |
 | `attach` | Optional. Files besides the project that the issue needs, such as a `.twinpack`: paths relative to the reproducer's folder, with forward slashes. `pack` adds each to `<slug>.zip`. A `cli` command finds a copy of each in its temp folder, at the same relative path: `{tmp}\garbage.twinproj` for `garbage.twinproj`, so a command may damage or write to it. |
@@ -1135,12 +1138,43 @@ be fixed in this build, and the entry may be ready to retire; for a filed bug it
 that a fix has been released. **manual**: not automatable,
 and `steps` is printed. **harness failed**: the tool could not do its job, as for a
 `tbbuild` or `tbrun` exit of 2, or a compile that never settled; that says nothing about
-the bug unless `expect.exit` names it. Reproducers run one at a time. `--jobs N` runs N at
+the bug unless `expect.exit` names it; for a `lane` reproducer, the suite's runner exiting
+2 or 3, or a named test missing from the lane's report. A `lane` reproducer whose test
+failed is **NO LONGER REPRODUCES**, so read the lane's report before retiring the entry:
+a test can fail for another reason. Reproducers run one at a time. `--jobs N` runs N at
 once, each in the IDE on its own port, from `--port` up. `verify` tidies the IDE's registry
-entries once for all of them, as [`check_examples.mjs`](#check-examples) does.
+entries once for all of them, as [`check_examples.mjs`](#check-examples) does. The `lane`
+reproducers run last: each suite's runner once, with `--only` naming every lane they need,
+and the runner tidies the registry for its lanes.
 
 Exit codes: **0** done --- a project that compiled, built or ran as it should, or, for `verify`, every reproducer that can be run on its own still reproduces; **1** a finding: the project has errors, or its build failed after a clean compile, or, for `vb6`, VB6 refused the project, or, for `verify`, at least one reproducer no longer reproduces; **2** a refused command line, a `repro.json` that is not valid, no IDE, a project that could not be packed, a harness that failed, or a crash; for `vb6`, no VB6, a reproducer with no `vb6/` folder, a project that has no `Probe.vbp` or calls `MsgBox` or `InputBox`, or VB6 failing to build it; for `verify`, a lane's harness failed; for `file`, an entry that is missing, ambiguous or marked unreadably, or a `bugs/filed/<slug>` already there, with nothing changed; **3** `new` found `bugs/<slug>` or `bugs/filed/<slug>` already there; **4** the compile never settled; **5** the project crashes the compiler; **6** `run`: the probe printed nothing; for `vb6`, the exe wrote no `out.txt`, or an empty one; **7** `run`: the probe ended before it returned; **8** `run --exe`, and `vb6`: the exe exited with a code other than 0, or was still running after `--timeout`, or, with `vb6`, the Application event log records that it faulted (a VB6 exe that dies of an access violation exits with code 0); **9** `run` and `vb6`: a picture that `images` names was not written, or could not be read.
 
+### probe_shared_temp.mjs
+{: #probe-shared-temp }
+
+    node scripts/probe_shared_temp.mjs [--ides N] [--rounds R] [--control] [--all]
+                                       [--ide <twinBASIC.exe>] [--port N] [--timeout S]
+
+Counts the builds that fail to write the type library when several IDEs build at once in one `TEMP` folder. It is the measurement behind the entry of `BUGS-TO-REPORT.md` whose reproducer is `bugs/concurrent-builds-shared-temp/`: such a build ends with `[TYPELIB] failed to finalize typelibrary.  Disk error?`, then `[LINKER] FAILED to create type library` and `[BUILD] failed`. Like [`tbbuild.mjs`](#tbbuild), it needs a twinBASIC install and Windows, and it is outside every gate and outside CI.
+
+Each round starts `--ides` IDEs at once, each on its own port and each opening a copy of the reproducer's project, packed into a folder under `%TEMP%\tbprobe-shared-temp\` with an explicit build path. An IDE builds one project and is ended, because an IDE reused for a second project wedges. Every IDE compiles its project, then waits until all the others have compiled, so that Build is pressed in all of them at about the same moment. A build whose log holds a `[TYPELIB] failed` line or `FAILED to create type library` failed to write the type library. Any other failed build is not what the probe measures; it ends the probe with exit 2.
+
+[`tbbuild.mjs`](#tbbuild) gives every IDE a `TEMP` folder of its own, so no build of the harness shares one. The probe gives all its IDEs one folder, made for the run under `%TEMP%\tbprobe-shared-temp\` and deleted afterwards, through the `env` option of `launchIde`. With `--control` it leaves the harness's own folders in place, one for each IDE, which is the reproducer's control.
+
+| Flag | Effect |
+|---|---|
+| `--ides <n>` | IDEs at once. Default 8. |
+| `--rounds <r>` | Rounds, one build in each IDE. Default 24. |
+| `--control` | Give each IDE a `TEMP` folder of its own. No build is expected to fail. |
+| `--all` | Run every round. By default the probe stops after the round in which it first sees a type library fail, because one is enough to show the defect. |
+| `--ide <path>` | Path to `twinBASIC.exe`, found as for `tbbuild`. |
+| `--port <n>` | The first DevTools port to try. Default 9760. The IDEs take the first free ports from it. |
+| `--timeout <secs>` | The wait for a compile to settle, and again for a build. Default 180. |
+
+The output is one `round <k>: <n> failed` line for each round, the last console lines of every build that failed, and a last line of the form `<f> of <n> builds failed to write the type library (TEMP shared)`, or `(TEMP per IDE)` under `--control`. Other work on the machine, such as lanes of [`addin_test.mjs`](#addin-test) or [`ide_test.mjs`](#ide-test), loads the same processor, and a disturbed run is not comparable with a quiet one.
+
+Exit codes: **0** no build failed to write the type library; **1** at least one did, so the defect is there; **2** a refused command line, no IDE, no free ports, an IDE that did not start, a project that did not compile, a build that failed in some other way, or a crash.
+
 ### vb6run.mjs
 {: #vb6run }
 
diff --git a/scripts/bug_repro.mjs b/scripts/bug_repro.mjs
index 692ce21cc..7c9444669 100644
--- a/scripts/bug_repro.mjs
+++ b/scripts/bug_repro.mjs
@@ -20,9 +20,12 @@
 // asked whether it still does.
 //
 // bugs/<slug>/repro.json says how to ask. `verify` reads it for every reproducer:
-// the mode (compile, build, run, cli or manual), the target, and what a
-// reproduction looks like (`expect`). Its keys are listed by loadRepro() below,
-// and the contributor-facing description is docs/Documentation/Tools.md.
+// the mode (compile, build, run, cli, lane, probe or manual), the target, and what
+// a reproduction looks like (`expect`). Its keys are listed by loadRepro() below,
+// and the contributor-facing description is docs/Documentation/Tools.md. A lane
+// reproducer names a lane of test/ide or test/addin and the tests in it that pass
+// while the bug is there; a probe reproducer names a script under scripts/ that
+// verify runs and judges by `expect`. Only a manual one needs a person.
 //
 // Exit codes: 0 done, 1 a finding, 2 the tool could not do its job, 3 and up its
 // own -- see USAGE. tbbuild's and tbrun's exit codes are mapped into that table by
@@ -104,6 +107,7 @@ import {
 } from "node:fs";
 import { tmpdir } from "node:os";
 import path from "node:path";
+import { pathToFileURL } from "node:url";
 import {
   CliError,
   choiceOption,
@@ -205,7 +209,11 @@ Commands:
                         issue, and one that no longer reproduces is probably fixed.
                         Needs a twinBASIC install; run by a person only. A run-mode
                         reproducer with expect.imagesDiffer compares its fresh
-                        pictures (kept in the temp folder) with images/<name>-vb6.png
+                        pictures (kept in the temp folder) with images/<name>-vb6.png.
+                        A lane reproducer ("lane": "ide:<lane>" or "addin:<lane>")
+                        reproduces when every test it names passes; its lanes run
+                        last, through ide_test or addin_test. A probe reproducer
+                        runs node <script> <args...> and is judged by its expect
   file <slug> <issue>   move the entry whose reproducer is <slug> out of
                         BUGS-TO-REPORT.md into bugs/filed/<slug>/REPORT.md, move
                         bugs/<slug>/ to bugs/filed/<slug>/, and record the issue in
@@ -615,17 +623,30 @@ function pack(slug) {
 
 // ------------------------------------------------------------ repro.json
 
-const MODES = ["compile", "build", "run", "cli", "manual"];
+const MODES = ["compile", "build", "run", "cli", "lane", "probe", "manual"];
 // The warnings loadRepro has printed, so that a reproducer read by several commands warns once.
 const warned = new Set();
-// What `expect` may hold in each mode.
+// What `expect` may hold in each mode. A lane reproducer has no `expect`: its tests are what it expects.
 const EXPECT_KEYS = {
   compile: ["exit", "diagnostics", "noDiagnostics"],
   build: ["exit", "message"],
   run: ["exit", "output", "absent", "imagesDiffer"],
   cli: ["exit", "output", "absent"],
+  probe: ["exit", "output", "absent"],
 };
 
+// The suites a lane reproducer names, as "<suite>:<lane>": the runner, and the
+// lanes it has, by the name its --only matches and its report prints.
+const SUITES = {
+  ide: { tool: "scripts/ide_test.mjs", lanes: "test/ide/lanes.mjs" },
+  addin: { tool: "scripts/addin_test.mjs", lanes: "test/addin/lanes.mjs" },
+};
+const laneNames = {};
+for (const [suite, { lanes }] of Object.entries(SUITES)) {
+  const list = (await import(pathToFileURL(path.join(REPO_ROOT, lanes)).href)).default;
+  laneNames[suite] = list.map((l) => l.name ?? path.basename(l.file, ".test.mjs"));
+}
+
 /**
  * Reads and strictly checks bugs/<slug>/repro.json. A fault is a Fail that names
  * the file and the key. Returns the file's content with each regular expression
@@ -649,15 +670,31 @@ function loadRepro(slug, { makingPictures = false } = {}) {
   }
   const isObject = (v) => v !== null && typeof v === "object" && !Array.isArray(v);
   if (!isObject(json)) return bad("", "must be a JSON object");
-  const keys = ["mode", "arch", "llvm", "exe", "expect", "cli", "steps", "attach", "images", "issue", "existing"];
+  const keys = [
+    "mode",
+    "arch",
+    "llvm",
+    "exe",
+    "expect",
+    "cli",
+    "lane",
+    "tests",
+    "probe",
+    "steps",
+    "attach",
+    "images",
+    "issue",
+    "existing",
+  ];
   for (const key of Object.keys(json)) if (!keys.includes(key)) bad(key, "is not a key repro.json has");
   if (!MODES.includes(json.mode)) bad("mode", `must be one of ${MODES.join(", ")}`);
   const { mode } = json;
-  // A cli or manual reproducer may have no project of its own: a cli one can
-  // name the files an installation ships by {ide}.
+  // A cli, lane, probe or manual reproducer may have no project of its own: a cli
+  // one can name the files an installation ships by {ide}, and a lane or a probe
+  // brings its own.
   const p = where(slug);
   const hasSrc = existsSync(path.join(p.src, "Settings"));
-  if (!hasSrc && !["cli", "manual"].includes(mode))
+  if (!hasSrc && !["cli", "lane", "probe", "manual"].includes(mode))
     bad("mode", `${mode} needs a project, and there is no ${rel(p.src)}/Settings`);
   if ("attach" in json) {
     if (!hasSrc) bad("attach", `goes into ${slug}.zip, which pack writes only from ${rel(p.src)}/`);
@@ -728,13 +765,37 @@ function loadRepro(slug, { makingPictures = false } = {}) {
       }
     }
   } else if ("cli" in json) bad("cli", "applies to the cli mode only");
+  if (mode === "lane") {
+    const [suite, lane, ...rest] = typeof json.lane === "string" ? json.lane.split(":") : [];
+    if (!SUITES[suite] || !lane || rest.length) {
+      bad("lane", `must be "<suite>:<lane>", the suite one of ${Object.keys(SUITES).join(", ")}`);
+    }
+    if (!laneNames[suite].includes(lane)) bad("lane", `names ${lane}, which is not a lane of ${SUITES[suite].lanes}`);
+    const isTests =
+      Array.isArray(json.tests) && json.tests.length && json.tests.every((t) => typeof t === "string" && t);
+    if (!isTests) bad("tests", "must be a list of the lane's test names, each of which passes while the bug is there");
+  } else {
+    if ("lane" in json) bad("lane", "applies to the lane mode only");
+    if ("tests" in json) bad("tests", "applies to the lane mode only");
+  }
+  if (mode === "probe") {
+    const [script, ...args] = Array.isArray(json.probe) ? json.probe : [];
+    if (
+      typeof script !== "string" ||
+      !/^scripts\/[\w.-]+\.mjs$/.test(script) ||
+      !args.every((a) => typeof a === "string")
+    ) {
+      bad("probe", "must be a list: a script under scripts/ (scripts/<name>.mjs), then its arguments");
+    }
+    if (!existsSync(path.join(REPO_ROOT, script))) bad("probe", `names ${script}, which is not there`);
+  } else if ("probe" in json) bad("probe", "applies to the probe mode only");
 
   const out = { ...json, expect: undefined };
-  if (mode === "manual") {
-    if ("expect" in json) bad("expect", "does not apply to the manual mode");
+  if (mode === "manual" || mode === "lane") {
+    if ("expect" in json) bad("expect", `does not apply to the ${mode} mode`);
     return out;
   }
-  if (!isObject(json.expect)) bad("expect", "is required, an object, for every mode but manual");
+  if (!isObject(json.expect)) bad("expect", "is required, an object, for every mode but lane and manual");
   const e = json.expect;
   for (const key of Object.keys(e)) {
     if (!["exit", "diagnostics", "noDiagnostics", "output", "absent", "message", "imagesDiffer"].includes(key)) {
@@ -1203,10 +1264,11 @@ async function verifyOne(slug, repro, lane) {
   // The pictures of a run that is judged by them are staged in the temp folder, and never kept in the tree.
   let imagesDir = null;
   try {
-    if (existsSync(path.join(where(slug).src, "Settings"))) pack(slug);
+    if (repro.mode !== "probe" && existsSync(path.join(where(slug).src, "Settings"))) pack(slug);
     let r;
     let table;
     if (repro.mode === "cli") r = await runCli(slug, repro, o);
+    else if (repro.mode === "probe") r = await runProbeScript(repro);
     else if (repro.mode === "run") {
       const judged = "imagesDiffer" in repro.expect;
       r = await runProbe(slug, { ...o, llvm: repro.llvm, exe: repro.exe, images: judged ? repro.images : null });
@@ -1245,6 +1307,120 @@ async function verifyOne(slug, repro, lane) {
   }
 }
 
+// A probe reproducer: the script, run with node from the repository's root, with
+// --ide passed on when verify was given one. It starts what it needs itself, ends
+// it, and must end on its own; what it prints is judged by `expect`.
+function runProbeScript(repro) {
+  const [script, ...args] = repro.probe;
+  const argv = [path.join(REPO_ROOT, script), ...args, ...(values.ide ? ["--ide", values.ide] : [])];
+  return new Promise((resolve) => {
+    const child = spawn(process.execPath, argv, {
+      cwd: REPO_ROOT,
+      stdio: ["ignore", "pipe", "pipe"],
+      windowsHide: true,
+    });
+    let output = "";
+    child.stdout.on("data", (d) => {
+      output += d;
+    });
+    child.stderr.on("data", (d) => {
+      output += d;
+    });
+    child.on("error", (e) => resolve({ code: null, output, message: `could not start ${script}: ${e.message}` }));
+    child.on("close", (code) => resolve({ code, output, stdout: output }));
+  });
+}
+
+// The spec reporter's marks for a test that passed and one that failed.
+const PASSED = "\u{2714}";
+const FAILED = "\u{2716}";
+
+/**
+ * Runs the lanes that lane reproducers name, each suite's once through its own
+ * runner, and judges each reproducer by its tests: it reproduces when every one
+ * passed. Returns one result per slug, as verifyOne does.
+ */
+async function verifyLanes(slugs, repros) {
+  const results = [];
+  for (const [suite, { tool }] of Object.entries(SUITES)) {
+    const mine = slugs.filter((s) => repros.get(s).lane.split(":")[0] === suite);
+    if (!mine.length) continue;
+    const lanes = [...new Set(mine.map((s) => repros.get(s).lane.split(":")[1]))];
+    const argv = [path.join(REPO_ROOT, tool), "--only", `^(${lanes.join("|")})$`];
+    if (values.ide) argv.push("--ide", values.ide);
+    if (values.show) argv.push("--show");
+    if (values.hide) argv.push("--hide");
+    console.log(`running ${tool} for ${lanes.join(", ")}`);
+    // The runner owns the registry for its lanes. verify's own tidy has ended by
+    // now, and the variable it left would make the runner refuse to start.
+    const env = { ...process.env };
+    delete env.TB_REGISTRY_OWNER;
+    const r = await new Promise((resolve) => {
+      const child = spawn(process.execPath, argv, {
+        cwd: REPO_ROOT,
+        env,
+        stdio: ["ignore", "pipe", "pipe"],
+        windowsHide: true,
+      });
+      let out = "";
+      child.stdout.on("data", (d) => {
+        out += d;
+      });
+      child.stderr.on("data", (d) => {
+        out += d;
+      });
+      child.on("error", (e) => resolve({ code: null, out: `${out}\ncould not start ${tool}: ${e.message}` }));
+      child.on("close", (code) => resolve({ code, out }));
+    });
+    // Kept whole, for a result that needs reading: the runner's report is long.
+    const log = path.join(tmpdir(), "bugrepro", `verify-${suite}.log`);
+    mkdirSync(path.dirname(log), { recursive: true });
+    writeFileSync(log, r.out);
+    const lines = r.out.split(/\r?\n/);
+    // A lane's report is the block from its "--- <name> (port <n>): ..." line to the next lane's.
+    const block = (lane) => {
+      const start = lines.findIndex((l) => l.startsWith(`--- ${lane} (port `));
+      if (start < 0) return null;
+      const end = lines.findIndex((l, i) => i > start && l.startsWith("--- "));
+      return lines.slice(start, end < 0 ? lines.length : end);
+    };
+    // The runner's 2 is its harness failing, and 3 the registry or a work folder
+    // not put back: either leaves no verdict to trust.
+    const broken = r.code === null || r.code >= 2;
+    const said = r.out.trim().split("\n").slice(-3).join(" | ");
+    for (const slug of mine) {
+      const repro = repros.get(slug);
+      const lane = repro.lane.split(":")[1];
+      const report = block(lane);
+      const res = (status, detail) =>
+        results.push({ slug, status, detail: status === "reproduces" ? detail : `${detail} (see ${log})` });
+      if (broken) {
+        res("harness", `${tool} exit ${r.code}: ${said}`);
+        continue;
+      }
+      if (!report) {
+        res("harness", `${tool} printed no report for the lane ${lane}`);
+        continue;
+      }
+      const mark = (test) => {
+        const found = report
+          .map((l) => l.trimStart())
+          .filter((l) => l.startsWith(`${PASSED} ${test} (`) || l.startsWith(`${FAILED} ${test} (`));
+        if (!found.length) return null;
+        return found.some((l) => l.startsWith(FAILED)) ? "failed" : "passed";
+      };
+      const marks = repro.tests.map((test) => ({ test, mark: mark(test) }));
+      const missing = marks.filter((m) => !m.mark);
+      const failed = marks.filter((m) => m.mark === "failed");
+      if (missing.length)
+        res("harness", `the lane ${lane} did not report ${missing.map((m) => `"${m.test}"`).join(", ")}`);
+      else if (failed.length) res("no-longer", `${repro.lane}: failed ${failed.map((m) => `"${m.test}"`).join(", ")}`);
+      else res("reproduces", `${repro.lane}: ${marks.length} test${marks.length === 1 ? "" : "s"} passed`);
+    }
+  }
+  return results;
+}
+
 const LABEL = {
   reproduces: "reproduces",
   "no-longer": "NO LONGER REPRODUCES",
@@ -1288,16 +1464,22 @@ async function verify() {
     });
   }
   const results = [];
-  const queue = [...all];
+  const report = (res) => {
+    const repro = repros.get(res.slug);
+    res.filed = where(res.slug).filed;
+    results.push(res);
+    console.log(
+      `${res.slug}${filedLabel(res.filed, repro)}: ${LABEL[res.status]}${res.detail ? ` -- ${res.detail}` : ""}`,
+    );
+  };
+  // Lane reproducers run last, through their suites' runners, which take their
+  // lanes' ports and own the registry while they run.
+  const byLane = all.filter((s) => repros.get(s).mode === "lane");
+  const queue = all.filter((s) => !byLane.includes(s));
   const lane = async (index) => {
     while (queue.length) {
       const slug = queue.shift();
-      const repro = repros.get(slug);
-      const res = { ...(await verifyOne(slug, repro, port + index)), filed: where(slug).filed };
-      results.push(res);
-      console.log(
-        `${slug}${filedLabel(res.filed, repro)}: ${LABEL[res.status]}${res.detail ? ` -- ${res.detail}` : ""}`,
-      );
+      report(await verifyOne(slug, repros.get(slug), port + index));
     }
   };
   try {
@@ -1306,6 +1488,7 @@ async function verify() {
     finishTidy(tidy);
     tidy = null;
   }
+  for (const res of await verifyLanes(byLane, repros)) report(res);
   const count = (status, filed = false) => results.filter((r) => r.status === status && r.filed === filed).length;
   const summary = (filed) =>
     `${count("reproduces", filed)} reproduce, ${count("no-longer", filed)} no longer reproduce, ` +
diff --git a/scripts/lib/cli-cases.mjs b/scripts/lib/cli-cases.mjs
index 6baa27b0f..a960379e8 100644
--- a/scripts/lib/cli-cases.mjs
+++ b/scripts/lib/cli-cases.mjs
@@ -378,6 +378,7 @@ const HELP_TOOLS = {
   "scripts/gen_attribute_probes.mjs": "Generate a twinBASIC probe project for Reference/Attributes.md applicability.\n",
   "scripts/impexp.mjs": "Usage:\n",
   "scripts/pick_a11y_sample.mjs": null,
+  "scripts/probe_shared_temp.mjs": null,
   "scripts/survey_tooling.mjs": null,
   "scripts/sweep_a11y.mjs": null,
   "scripts/sweep_attributes.mjs": null,
@@ -453,6 +454,7 @@ const REFUSALS = {
   "scripts/gen_attribute_probes.mjs": [null],
   "scripts/impexp.mjs": [null, { prefix: "ERROR: " }],
   "scripts/pick_a11y_sample.mjs": ["sweep"],
+  "scripts/probe_shared_temp.mjs": ["ide"],
   "scripts/survey_tooling.mjs": ["root"],
   "scripts/sweep_a11y.mjs": ["out"],
   "scripts/sweep_attributes.mjs": ["out"],
diff --git a/scripts/probe_shared_temp.mjs b/scripts/probe_shared_temp.mjs
new file mode 100644
index 000000000..bc209aff2
--- /dev/null
+++ b/scripts/probe_shared_temp.mjs
@@ -0,0 +1,294 @@
+#!/usr/bin/env node
+// Measure whether twinBASIC builds that share one TEMP folder fail to write the type library.
+//
+//     node scripts/probe_shared_temp.mjs [options]
+//
+// The defect is the entry of BUGS-TO-REPORT.md whose reproducer is
+// bugs/concurrent-builds-shared-temp/: several IDEs building at once with one
+// TEMP folder now and then fail with `[TYPELIB] failed to finalize
+// typelibrary.  Disk error?`, then `[LINKER] FAILED to create type library` and
+// `[BUILD] failed`. The reproducer needs eight IDEs at once, which bug_repro
+// cannot run, so this probe runs them.
+//
+// Each round starts --ides IDEs at once, one cold start each (an IDE reused for
+// a second project wedges), each on a project of its own packed from the
+// reproducer's source. Every IDE compiles its project, then all wait for each
+// other, so that Build is pressed in all of them at about the same moment, as the
+// reproducer's step 3 asks. The build log of each is read and a build that failed
+// is classified by it.
+//
+// The harness gives every IDE a temp folder of its own (launchIde). The probe
+// takes that back for the run it measures: TEMP and TMP of every IDE are one
+// folder made for the run, passed in launchIde's `env`. --control leaves the
+// harness's own folders in place, which is the control of the reproducer's step 4.
+//
+// compileProject (lib/tb-build.mjs) has no `env`, so the probe does its steps
+// itself, in the order compileProject does them, over the same library calls.
+//
+// Exit codes: see USAGE.
+import { existsSync, mkdirSync, rmSync } from "node:fs";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { die, exitOnCrash, numberOption, parseCli, printHelpAndExit, withUsageError } from "../lib/cli.mjs";
+import { buildNumber, findIde } from "./lib/tb-install.mjs";
+import {
+  attachIde,
+  buildProject,
+  compileOutcome,
+  launchIde,
+  setBuildTarget,
+  shutdownIdeAsync,
+  waitForCompile,
+} from "./lib/tb-ide.mjs";
+import { claimPorts } from "./lib/tb-ports.mjs";
+import { laneProjectId, stageProject } from "./lib/tb-project.mjs";
+import { finishTidy, startTidy } from "./lib/tb-registry.mjs";
+
+let tidy = null;
+let work = null;
+function cleanUp() {
+  finishTidy(tidy);
+  tidy = null;
+  if (work) {
+    try {
+      rmSync(work, { recursive: true, force: true });
+    } catch {
+      // a file still held open; the next run on this port empties the folder
+    }
+    work = null;
+  }
+}
+exitOnCrash(cleanUp);
+
+const USAGE = `usage: node scripts/probe_shared_temp.mjs [--ides N] [--rounds R] [--control] [--all] [--ide <twinBASIC.exe>] [--port N] [--timeout S] [-h, --help]
+
+Starts N twinBASIC IDEs at once, each building its own copy of the project of
+bugs/concurrent-builds-shared-temp/, with one TEMP folder for all of them, and
+counts the builds that fail to write the type library. It prints one line per
+round, the last console lines of every build that failed, and a summary line
+\`<f> of <n> builds failed to write the type library (TEMP shared|TEMP per IDE)\`.
+
+  --ides <n>        IDEs at once (default 8)
+  --rounds <r>      rounds of one build in each IDE (default 24)
+  --control         give each IDE a TEMP folder of its own, instead of one folder
+                    for all of them: the control, which is expected to fail none
+  --all             run every round; by default the probe stops after the round
+                    in which it first sees a type library fail
+  --ide <path>      twinBASIC.exe (default: $TB_IDE, else the newest
+                    twinBASIC_IDE_BETA_* on the Desktop)
+  --port <n>        first DevTools port to try (default 9760); the IDEs take the
+                    first free ports from it
+  --timeout <secs>  give up waiting for a compile, and again for a build (default 180)
+  -h, --help        print this text and exit
+
+Exit codes:
+  0  no build failed to write the type library
+  1  at least one build did: the defect is there
+  2  the probe could not do its job: a refused command line, no IDE, no free
+     ports, an IDE that did not start, a project that did not compile, a build
+     that failed in some other way, or a crash`;
+
+const usageError = { format: (err) => `${err.message}\n${USAGE}` };
+
+const { values } = withUsageError(
+  () =>
+    parseCli(process.argv.slice(2), {
+      options: {
+        ides: { type: "string" },
+        rounds: { type: "string" },
+        control: { type: "boolean", default: false },
+        all: { type: "boolean", default: false },
+        ide: { type: "string" },
+        port: { type: "string" },
+        timeout: { type: "string" },
+        help: { type: "boolean", short: "h", default: false },
+      },
+      stopAt: ["help"],
+    }),
+  usageError,
+);
+if (values.help) printHelpAndExit(USAGE);
+
+const { ides, rounds, port, timeout } = withUsageError(
+  () => ({
+    ides: numberOption(values.ides ?? "8", { option: "--ides", integer: true, min: 1, max: 32 }),
+    rounds: numberOption(values.rounds ?? "24", { option: "--rounds", integer: true, min: 1 }),
+    port: numberOption(values.port ?? "9760", { option: "--port", integer: true, min: 1, max: 65535 }),
+    timeout: numberOption(values.timeout ?? "180", { option: "--timeout", above: 0 }) * 1000,
+  }),
+  usageError,
+);
+const control = values.control;
+const runAll = values.all;
+
+const IDE = findIde(values.ide);
+if (!IDE || !existsSync(IDE)) {
+  die(
+    2,
+    (IDE ? `no twinBASIC IDE at ${IDE}: ` : "no twinBASIC IDE found: ") +
+      "pass --ide <twinBASIC.exe>, set TB_IDE, or unpack a twinBASIC_IDE_BETA_<n> folder on your Desktop",
+  );
+}
+
+const REPO = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
+const SOURCE = path.join(REPO, "bugs", "concurrent-builds-shared-temp", "src");
+if (!existsSync(path.join(SOURCE, "Settings"))) die(2, `the reproducer's source is missing: ${SOURCE}`);
+
+// What the build log says when the type library is the part that failed.
+const TYPELIB_FAILED = /\[TYPELIB\] failed|FAILED to create type library/;
+const label = control ? "TEMP per IDE" : "TEMP shared";
+
+// All the lanes wait here once they have compiled, so that Build is pressed in
+// all of them together. A lane that never gets there is dropped, or the rest
+// would wait for it for ever.
+function makeBarrier(count) {
+  let expected = count;
+  let waiting = [];
+  const release = () => {
+    if (waiting.length < expected) return;
+    const open = waiting;
+    waiting = [];
+    for (const resolve of open) resolve();
+  };
+  return {
+    arrive: () =>
+      new Promise((resolve) => {
+        waiting.push(resolve);
+        release();
+      }),
+    drop: () => {
+      expected--;
+      release();
+    },
+  };
+}
+
+/**
+ * One build in a cold-started IDE.
+ *
+ * @returns {Promise<{kind: "ok" | "typelib" | "other", log: string[], message: string}>}
+ */
+async function buildOnce({ project, lanePort, env, barrier }) {
+  let handle = null;
+  let c = null;
+  let arrived = false;
+  const fail = (message, log = []) => ({ kind: "other", log, message });
+  try {
+    try {
+      handle = await launchIde({ exe: IDE, project, port: lanePort, env });
+    } catch (e) {
+      return fail(e.message);
+    }
+    c = await attachIde(lanePort);
+    if (!c) return fail("the IDE never exposed a debug port");
+
+    let outcome = compileOutcome(await waitForCompile(c, { project, timeout }), { name: project });
+    if (!outcome.ok) return fail(outcome.message);
+    try {
+      const target = await setBuildTarget(c, "win32", { project, timeout });
+      if (target.waited) {
+        outcome = compileOutcome(target.waited, { name: project });
+        if (!outcome.ok) return fail(outcome.message);
+      }
+    } catch (e) {
+      return fail(e.message);
+    }
+    if (outcome.counts[0] > 0)
+      return fail(`the project compiled with ${outcome.counts[0]} error(s):\n${outcome.rows.join("\n")}`);
+
+    arrived = true;
+    await barrier.arrive();
+    const built = await buildProject(c, { timeout });
+    if (built.ok) return { kind: "ok", log: built.log, message: "" };
+    if (built.log.some((l) => TYPELIB_FAILED.test(l)))
+      return { kind: "typelib", log: built.log, message: built.message };
+    return fail(built.message, built.log);
+  } catch (e) {
+    return fail(e.stack ?? String(e));
+  } finally {
+    if (!arrived) barrier.drop();
+    try {
+      c?.close();
+    } catch {
+      // the IDE is about to be ended
+    }
+    await shutdownIdeAsync(handle);
+  }
+}
+
+// ----------------------------------------------------------------- the run
+
+let ports;
+try {
+  ports = await claimPorts(ides, { from: port });
+} catch (e) {
+  die(2, e.message);
+}
+
+work = path.join(tmpdir(), "tbprobe-shared-temp", String(ports[0]));
+rmSync(work, { recursive: true, force: true });
+const sharedTemp = path.join(work, "shared-temp");
+mkdirSync(sharedTemp, { recursive: true });
+tidy = startTidy({ prefixes: [work] });
+
+console.log(
+  `BETA ${buildNumber(IDE) ?? "?"}: ${ides} IDE(s) at once, up to ${rounds} round(s), ` +
+    (control ? "a TEMP folder for each IDE" : `one TEMP folder for all: ${sharedTemp}`),
+);
+
+const t0 = Date.now();
+let builds = 0;
+let typelibFailures = 0;
+const others = [];
+
+try {
+  for (let round = 1; round <= rounds; round++) {
+    const projects = ports.map((lanePort) => {
+      const lane = path.join(work, String(lanePort));
+      const out = path.join(lane, "out");
+      mkdirSync(out, { recursive: true });
+      const project = path.join(lane, "probe.twinproj");
+      stageProject({
+        src: SOURCE,
+        stage: path.join(lane, "stage"),
+        project,
+        settings: {
+          "project.buildPath": path.join(out, "${ProjectName}_${Architecture}.${FileExtension}"),
+          "project.id": laneProjectId(6, lanePort),
+        },
+      });
+      return project;
+    });
+    const env = control ? {} : { TEMP: sharedTemp, TMP: sharedTemp };
+    const barrier = makeBarrier(ides);
+    const results = await Promise.all(
+      projects.map((project, i) => buildOnce({ project, lanePort: ports[i], env, barrier })),
+    );
+
+    builds += results.length;
+    const failed = results.map((r, i) => ({ ...r, port: ports[i] })).filter((r) => r.kind === "typelib");
+    typelibFailures += failed.length;
+    console.log(`round ${round}: ${failed.length} failed`);
+    for (const r of failed) {
+      console.log(`  IDE on port ${r.port}, round ${round}:`);
+      for (const l of r.log.slice(-8)) console.log(`    ${l}`);
+    }
+    results.forEach((r, i) => {
+      if (r.kind === "other") others.push({ round, port: ports[i], ...r });
+    });
+    if (others.length) break;
+    if (failed.length && !runAll) break;
+  }
+} finally {
+  cleanUp();
+}
+
+const secs = ((Date.now() - t0) / 1000).toFixed(0);
+console.log(`(${secs} s)`);
+for (const o of others) {
+  console.error(`round ${o.round}, port ${o.port}: a build failed in another way:\n${o.message}`);
+  for (const l of o.log.slice(-8)) console.error(`    ${l}`);
+}
+console.log(`${typelibFailures} of ${builds} builds failed to write the type library (${label})`);
+process.exit(others.length ? 2 : typelibFailures ? 1 : 0);
diff --git a/test/ide/build-and-exit-silent.test.mjs b/test/ide/build-and-exit-silent.test.mjs
new file mode 100644
index 000000000..8f6227d30
--- /dev/null
+++ b/test/ide/build-and-exit-silent.test.mjs
@@ -0,0 +1,135 @@
+// `twinBASIC.exe --buildAndExit32 <project>`, tested against the entry
+// "--buildAndExit32 writes nothing, exits 0 on a project with errors, and hangs
+// on a failing build" in BUGS-TO-REPORT.md (reproducer: bugs/build-and-exit-silent).
+// The switch belongs to the IDE executable, so the command runs on a private
+// desktop (launchOnDesktop), from the lane's own copy of the install, with the
+// lane's own APPDATA, and the project is packed into the lane's work folder.
+//
+// Each test states what BETA 983, 995 and 997 do. If one fails after an IDE
+// update, the switch has changed: update the entry in BUGS-TO-REPORT.md or
+// bugs/filed/, the notes that name it (scripts/tbbuild.mjs, WIP.Harness.md,
+// docs/Documentation/Tools.md, docs/Features/Packages/Import-export tool.md),
+// and then this file.
+//
+// Run it with ide-test.bat, which gives it a lane; on its own it is skipped.
+
+import assert from "node:assert/strict";
+import { existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs";
+import path from "node:path";
+import { test } from "node:test";
+import { fileURLToPath } from "node:url";
+import { launchOnDesktop, shutdownIde } from "../../scripts/lib/tb-ide.mjs";
+import { laneProjectId, stageProject } from "../../scripts/lib/tb-project.mjs";
+import { scenario } from "../addin/scenario.mjs";
+
+const HERE = path.dirname(fileURLToPath(import.meta.url));
+const SOURCE = path.join(HERE, "..", "..", "bugs", "build-and-exit-silent", "src");
+
+// A build that finishes does so in a few seconds; one that hangs was still
+// running after 30 and 40 seconds.
+const FINISH_LIMIT = 120 * 1000;
+const HANG_LIMIT = 45 * 1000;
+
+const read = (file) => (existsSync(file) ? readFileSync(file, "utf8") : "");
+
+// What the command printed, without Chromium's own log lines about shutting
+// down ("[...:ERROR:ui\gfx\win\window_impl.cc:172] Failed to unregister
+// class Chrome_WidgetWin_0. Error = 1412"), which say nothing about the build.
+const buildLines = (text) =>
+  text
+    .split(/\r?\n/)
+    .map((l) => l.trim())
+    .filter((l) => l && !/^\[[\d/.]+:[A-Z]+:[^\]]*\]/.test(l));
+
+scenario("--buildAndExit32 without a window to look at", (lane) => {
+  // Pack the reproducer into a folder of its own, optionally with Main calling
+  // Unused, and return where its files are and where the build would go.
+  function stage(name, { callUnused = false } = {}) {
+    const dir = path.join(lane.work, "bae", name);
+    const project = path.join(dir, "BuildAndExitSilent.twinproj");
+    mkdirSync(dir, { recursive: true });
+    stageProject({
+      src: SOURCE,
+      stage: path.join(dir, "src"),
+      project,
+      settings: { "project.id": laneProjectId(6, lane.port) },
+      prepare: (tree) => {
+        if (!callUnused) return;
+        const file = path.join(tree, "Sources", "Startup.twin");
+        const text = readFileSync(file, "utf8");
+        const edited = text.replace(/(Public Sub Main\(\)\r?\n)/, "$1        Unused\n");
+        assert.notEqual(edited, text, "the reproducer's Main was not found");
+        writeFileSync(file, edited, "utf8");
+      },
+    });
+    return { dir, project, exe: path.join(dir, "Build", "BuildAndExitSilent_win32.exe") };
+  }
+
+  // Run the switch on a project and wait up to `limit` ms. A command still running
+  // then is ended by its pid, and the result says so.
+  async function buildAndExit(name, project, limit) {
+    const dir = path.dirname(project);
+    const temp = path.join(lane.work, "temp", name);
+    mkdirSync(temp, { recursive: true });
+    const stdout = path.join(dir, "stdout.txt");
+    const stderr = path.join(dir, "stderr.txt");
+    const started = Date.now();
+    const run = await launchOnDesktop({
+      exe: lane.copy(),
+      arg: "--buildAndExit32",
+      args: [project],
+      desktop: `ide-test-bae-${lane.port}-${name}`,
+      env: {
+        ...process.env,
+        APPDATA: lane.appdataDir(),
+        TEMP: temp,
+        TMP: temp,
+        WEBVIEW2_USER_DATA_FOLDER: path.join(lane.work, "wv2", name),
+        TB_ADDIN_TEST: "1",
+      },
+      stdout,
+      stderr,
+      dialogs: "close",
+    });
+    let timer;
+    const hung = await Promise.race([
+      run.exited.then(() => false),
+      new Promise((r) => {
+        timer = setTimeout(() => r(true), limit);
+      }),
+    ]);
+    clearTimeout(timer);
+    if (hung) {
+      // By its pid and its job, never by image name.
+      shutdownIde(run);
+    }
+    const { code, dialogs } = await run.finished;
+    return {
+      hung,
+      code,
+      dialogs,
+      seconds: (Date.now() - started) / 1000,
+      stdout: read(stdout),
+      stderr: read(stderr),
+    };
+  }
+
+  test("an error in a procedure nothing calls: it exits 0, writes the exe, and says nothing", async () => {
+    const { project, exe } = stage("unused");
+    const r = await buildAndExit("unused", project, FINISH_LIMIT);
+    assert.equal(r.hung, false, `the command ran past ${FINISH_LIMIT / 1000} s`);
+    assert.equal(r.code, 0, `exit code ${r.code}`);
+    assert.ok(existsSync(exe), "no Build\\BuildAndExitSilent_win32.exe was written");
+    assert.deepEqual(buildLines(r.stdout), [], "the command wrote to stdout");
+    assert.deepEqual(buildLines(r.stderr), [], "the command wrote to stderr about the build");
+  });
+
+  test("an error in code the build reaches: it never exits and writes no exe", async () => {
+    const { project, exe } = stage("called", { callUnused: true });
+    const r = await buildAndExit("called", project, HANG_LIMIT);
+    assert.equal(r.hung, true, `the command ended after ${r.seconds} s with exit code ${r.code}`);
+    assert.equal(existsSync(exe), false, "a Build\\BuildAndExitSilent_win32.exe was written");
+    assert.deepEqual(buildLines(r.stdout), [], "the command wrote to stdout");
+    assert.deepEqual(buildLines(r.stderr), [], "the command wrote to stderr about the build");
+  });
+});
diff --git a/test/ide/lanes.mjs b/test/ide/lanes.mjs
index 7541aa4e8..3dc29edfd 100644
--- a/test/ide/lanes.mjs
+++ b/test/ide/lanes.mjs
@@ -25,4 +25,7 @@ export default [
   { file: "break-into.test.mjs" },
   { file: "console-completion.test.mjs" },
   { file: "console-space.test.mjs" },
+  { file: "build-and-exit-silent.test.mjs" },
+  { file: "recent-projects-copies.test.mjs" },
+  { file: "typing-after-open.test.mjs" },
 ];
diff --git a/test/ide/probes/typing-after-open/Settings b/test/ide/probes/typing-after-open/Settings
new file mode 100644
index 000000000..1ad263df7
--- /dev/null
+++ b/test/ide/probes/typing-after-open/Settings
@@ -0,0 +1,61 @@
+{
+	"configuration.inherits": "Defaults",
+	"project.appTitle": "TypingAfterOpenProbe",
+	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
+	"project.buildType": "Standard EXE",
+	"project.description": "test/ide/typing-after-open.test.mjs opens Haystack.twin at a line and types into it.",
+	"project.exportPathIsV2": true,
+	"project.id": "{7B247500-0000-4000-9000-7B24750000B0}",
+	"project.name": "TypingAfterOpenProbe",
+	"project.optionExplicit": true,
+	"project.references": [
+		{
+			"id": "{00020430-0000-0000-C000-000000000046}",
+			"lcid": 0,
+			"name": "OLE Automation",
+			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
+			"path64": "C:\\Windows\\System32\\stdole2.tlb",
+			"symbolId": "stdole",
+			"versionMajor": 2,
+			"versionMinor": 0
+		},
+		{
+			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "VB",
+			"versionBuild": 0,
+			"versionMajor": 0,
+			"versionMinor": 0,
+			"versionRevision": 31
+		},
+		{
+			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "AppGlobalClassProject",
+			"versionBuild": 0,
+			"versionMajor": 1,
+			"versionMinor": 0,
+			"versionRevision": 0
+		}
+	],
+	"project.settingsVersion": 1,
+	"project.startupObject": "Sub Main",
+	"project.warnings": {
+		"errors": [],
+		"hints": [],
+		"ignored": [],
+		"info": [],
+		"warnings": []
+	},
+	"runtime.useUnicodeStandardLibrary": true
+}
diff --git a/test/ide/probes/typing-after-open/Sources/Haystack.twin b/test/ide/probes/typing-after-open/Sources/Haystack.twin
new file mode 100644
index 000000000..fed207264
--- /dev/null
+++ b/test/ide/probes/typing-after-open/Sources/Haystack.twin
@@ -0,0 +1,8 @@
+' A haystack with a needle in it.
+Module Haystack
+    Public Function FindTheNeedle(ByVal n As Long) As Long
+        Dim needleCount As Long
+        needleCount = n * 2
+        Return needleCount
+    End Function
+End Module
diff --git a/test/ide/probes/typing-after-open/Sources/Main.twin b/test/ide/probes/typing-after-open/Sources/Main.twin
new file mode 100644
index 000000000..b9b0f93ec
--- /dev/null
+++ b/test/ide/probes/typing-after-open/Sources/Main.twin
@@ -0,0 +1,8 @@
+' Find in Files for "Dim needleCount" and open the result: Haystack.twin opens at line 4, column 9.
+Module Main
+    Public Sub Main()
+        Dim needle As Long
+        needle = FindTheNeedle(3)
+        Debug.Print needle
+    End Sub
+End Module
diff --git a/test/ide/recent-projects-copies.test.mjs b/test/ide/recent-projects-copies.test.mjs
new file mode 100644
index 000000000..c1cbf4973
--- /dev/null
+++ b/test/ide/recent-projects-copies.test.mjs
@@ -0,0 +1,127 @@
+// The IDE's recent-projects list, tested against the entry "The recent-projects
+// list fills its empty slots with copies of its last entry" in BUGS-TO-REPORT.md
+// (reproducer: bugs/recent-projects-copies).
+//
+// With "0" = A and "1" = B and "2" to "20" holding nothing, opening C leaves
+// "0" = C, "1" = A and "2" to "20" all = B: nineteen copies.
+//
+// THIS TEST WRITES THE USER'S OWN LIST, HKCU\Software\VB and VBA Program
+// Settings\twinBASIC_IDE\RecentlyOpened. Every IDE of every install reads and
+// writes that key whatever its APPDATA is. So the test records the key as it
+// is, value by value with the type of each, before it writes anything, and puts
+// it back with restoreKeys after the lane's IDE has exited, even when a test
+// failed. The runner's own tidy (startTidy and finishTidy in
+// scripts/lib/tb-registry.mjs) only keeps no more copies of a path than the key
+// had and drops every path under a lane's folder, so it is not relied on for
+// this. All three project paths are inside the lane's work folder.
+//
+// Any other IDE that opens a project while this runs, another lane's or another
+// session's, writes the same key and spoils the shape the test looks for. So
+// the test tries again, up to ATTEMPTS times, when the list does not even have
+// the opened project on top with A under it; a list that has both, and anything
+// but B in the slots below, is the defect gone, and fails the test at once.
+//
+// If the test fails after an IDE update, the IDE has changed: update the entry
+// in BUGS-TO-REPORT.md or bugs/filed/, WIP.Harness.md and
+// scripts/lib/tb-registry.mjs (which say a short list trips it), and then this
+// file.
+//
+// Run it with ide-test.bat, which gives it a lane; on its own it is skipped.
+
+import assert from "node:assert/strict";
+import { mkdirSync } from "node:fs";
+import path from "node:path";
+import { before, test } from "node:test";
+import { fileURLToPath } from "node:url";
+import { portTaken, sleep } from "../../scripts/lib/tb-ide.mjs";
+import { packTree } from "../../scripts/lib/tb-project.mjs";
+import { IDE_SETTINGS_KEY, norm, restoreKeys, snapshotKeys } from "../../scripts/lib/tb-registry.mjs";
+import { scenario } from "../addin/scenario.mjs";
+
+const HERE = path.dirname(fileURLToPath(import.meta.url));
+const SOURCE = path.join(HERE, "..", "..", "bugs", "recent-projects-copies", "src");
+const KEY = `${IDE_SETTINGS_KEY}\\RecentlyOpened`;
+const SLOTS = 21;
+const ATTEMPTS = 4;
+
+// The key's values as { name: data }, read now.
+function listNow() {
+  const [entry] = snapshotKeys([KEY]);
+  const values = entry.snap?.values ?? [];
+  return Object.fromEntries([].concat(values).map((v) => [v.name, v.data]));
+}
+
+scenario("the recent-projects list", (lane) => {
+  const folder = (name) => path.join(lane.work, "recent", name);
+  const A = path.join(folder("A"), "project.twinproj");
+  const B = path.join(folder("B"), "project.twinproj");
+  const C = path.join(folder("C"), "project.twinproj"); // where lane.open puts the project it is given
+  let found = null; // the key as the test found it, for restoreKeys
+
+  before(() => {
+    found = snapshotKeys([KEY]);
+    const entry = found[0].snap;
+    assert.ok(entry, "the IDE has no RecentlyOpened key to start from");
+    assert.deepEqual([].concat(entry.keys ?? []), [], "RecentlyOpened has subkeys, which this test does not expect");
+    for (const dir of ["A", "B", "C"]) mkdirSync(folder(dir), { recursive: true });
+    // A and B exist as projects, as in the reproducer; C is packed by lane.open.
+    packTree(A, SOURCE);
+    packTree(B, SOURCE);
+  });
+
+  // "0" = A, "1" = B and "2" to "20" deleted: restoreKeys deletes every value
+  // the snapshot does not list.
+  const setList = () =>
+    restoreKeys([
+      {
+        path: KEY,
+        snap: {
+          values: [
+            { name: "0", kind: "String", data: A },
+            { name: "1", kind: "String", data: B },
+          ],
+          keys: [],
+        },
+      },
+    ]);
+
+  // Open C, and read the list once the IDE has put C on top of it; the last
+  // list read if it never does.
+  async function openC() {
+    setList();
+    await lane.open(SOURCE, { folder: folder("C") });
+    let values = {};
+    for (let i = 0; i < 50; i++) {
+      values = listNow();
+      if (norm(values["0"] ?? "") === norm(C)) break;
+      await sleep(200);
+    }
+    return values;
+  }
+
+  test("opening a project fills the slots that held nothing with copies of the last entry", async (t) => {
+    let values;
+    for (let attempt = 1; attempt <= ATTEMPTS; attempt++) {
+      if (attempt > 1) {
+        await lane.closeProject();
+        // The ended IDE's WebView2 can hold the DevTools port for a while.
+        for (let i = 0; i < 150 && (await portTaken(lane.port)); i++) await sleep(200);
+      }
+      values = await openC();
+      t.diagnostic(`attempt ${attempt}: "0" and "1" ${norm(values["1"] ?? "") === norm(A) ? "as set" : "disturbed"}`);
+      if (norm(values["0"] ?? "") === norm(C) && norm(values["1"] ?? "") === norm(A)) break;
+    }
+    const shown = JSON.stringify(values);
+    assert.equal(norm(values["0"] ?? ""), norm(C), `"0" is not the opened project: ${shown}`);
+    assert.equal(norm(values["1"] ?? ""), norm(A), `"1" is not A: ${shown}`);
+    for (let i = 2; i < SLOTS; i++) {
+      assert.equal(norm(values[String(i)] ?? ""), norm(B), `"${i}" is not a copy of B: ${shown}`);
+    }
+  });
+
+  // After the lane has closed and its IDE has exited, which can write the list as
+  // it ends. Runs even when a test or the close failed.
+  return () => {
+    if (found) restoreKeys(found);
+  };
+});
diff --git a/test/ide/typing-after-open.test.mjs b/test/ide/typing-after-open.test.mjs
new file mode 100644
index 000000000..fa6a6cd37
--- /dev/null
+++ b/test/ide/typing-after-open.test.mjs
@@ -0,0 +1,114 @@
+// Typing just after a file opens at a line. For 700 ms after the code editor
+// opens a file at a line and column (Find in Files, Go To Definition, an
+// add-in's Editors.Open), the IDE puts the cursor back at that place whenever
+// the compiler's decorations for the document arrive, and every edit brings new
+// decorations, which start the 700 ms again (main.js, parseDocumentDecorations
+// ends with if(performance.now()-revealedLineTime<700){revealLineInEditor(...)}).
+// Typing that starts inside the window and goes on without a 0.7 s pause puts
+// each character at the opened position: with Haystack.twin opened at 4:9, the
+// cursor moved to 3:1 and "xyz" typed a key every 150 ms, "x" goes in at 3:1
+// and "y" and "z" both at 4:9, as "zy". Filed as twinbasic/twinbasic#2447; the
+// reproducer is bugs/filed/typing-after-open-reversed.
+//
+// This file opens the file through the page's openEditors.openFile, the call
+// Find in Files makes, and places the cursor itself, because openFile and
+// setCursor in scripts/lib/tb-operate.mjs wait out the 700 ms (afterReveal) and
+// so hide the defect from every other lane.
+//
+// The first test states what BETA 997 does. If it fails after an IDE update and
+// line 3 reads "xyz" in order, the defect is fixed: retire the entry, remove the
+// wait from afterReveal and this file, as the comment in
+// bugs/filed/typing-after-open-reversed/REPORT.md says. The control must hold
+// on every build.
+//
+// Run it with ide-test.bat, which gives it a lane; on its own it is skipped.
+
+import assert from "node:assert/strict";
+import { before, test } from "node:test";
+import { afterReveal, editorText, typeText } from "../../scripts/lib/tb-operate.mjs";
+import { sleep } from "../../scripts/lib/tb-ide.mjs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { scenario } from "../addin/scenario.mjs";
+
+const HERE = path.dirname(fileURLToPath(import.meta.url));
+const PROJECT = path.join(HERE, "probes", "typing-after-open");
+const FILE = "twinbasic:/TypingAfterOpenProbe/Sources/Haystack.twin";
+const OTHER = "twinbasic:/TypingAfterOpenProbe/Sources/Main.twin";
+
+const KEY_DELAY = 150;
+
+scenario("typing just after a file opens at a line", (lane) => {
+  let c;
+  let original;
+
+  // Opens `file` at a line and column as Find in Files does, without waiting
+  // for the IDE to stop revealing. Resolves once the IDE reports the file open,
+  // and returns the performance.now() of the page at that moment.
+  const open = (file, line, column) =>
+    c.evaluate(
+      `new Promise((resolve, reject) => {
+        const node = fs.tree.resolvePath(${JSON.stringify(file)});
+        if (!node) return reject(new Error("the project has no file ${file}"));
+        setTimeout(() => reject(new Error("the IDE did not report ${file} open within 10 s")), 10000);
+        openEditors.openFile(node, false, false, false, ${line}, ${column}, undefined,
+                             () => resolve(performance.now()));
+      })`,
+      { awaitPromise: true },
+    );
+
+  // Puts the cursor at 3:1 of the code editor and gives it the focus, as a
+  // person does by clicking there.
+  const cursorTo = (line, column) =>
+    c.evaluate(`(() => { editor.setPosition({ lineNumber: ${line}, column: ${column} }); editor.focus(); })()`);
+
+  // Opens Haystack.twin at 4:9, waits until `after` milliseconds have passed
+  // since the IDE reported it open, moves the cursor to 3:1 and types xyz a key
+  // every 150 ms; returns the lines 3 and 4 as they read when the IDE has
+  // stopped moving the cursor.
+  async function typeAfterOpen(after) {
+    // Start from another tab, so that the open is the one that makes
+    // Haystack.twin the tab shown.
+    await open(OTHER, 1, 1);
+    assert.ok(await afterReveal(c), "the IDE was still revealing lines 10 s after Main.twin opened");
+    const t0 = await open(FILE, 4, 9);
+    const wait = after - ((await c.evaluate("performance.now()")) - t0);
+    if (wait > 0) await sleep(wait);
+    await cursorTo(3, 1);
+    await typeText(c, "xyz", { delay: KEY_DELAY });
+    assert.ok(await afterReveal(c), "the IDE was still revealing lines 10 s after the typing");
+    await sleep(300);
+    const lines = (await editorText(c)).split(/\r?\n/);
+    // Put the file's own text back for the next test.
+    await c.evaluate(`editor.getModel().setValue(${JSON.stringify(original)})`);
+    assert.equal(await editorText(c), original, "the file's text was not put back");
+    await sleep(300);
+    return { line3: lines[2], line4: lines[3], head: lines.slice(0, 5) };
+  }
+
+  before(async () => {
+    c = await lane.open(PROJECT);
+    await open(FILE, 1, 1);
+    assert.ok(await afterReveal(c), "the IDE was still revealing lines 10 s after Haystack.twin opened");
+    original = await editorText(c);
+    assert.match(
+      original.split(/\r?\n/)[3],
+      /^ {8}Dim needleCount As Long$/,
+      "line 4 of Haystack.twin is not as expected",
+    );
+  });
+
+  test("typing begun 0.3 s after a file opens at a line is reordered by the re-reveal", async () => {
+    const { line3, line4, head } = await typeAfterOpen(300);
+    const shown = JSON.stringify(head);
+    assert.ok(line3.startsWith("x") && !line3.startsWith("xy"), `line 3 reads ${JSON.stringify(line3)}: ${shown}`);
+    assert.equal(line4, "        zyDim needleCount As Long", `lines 1 to 5 read ${shown}`);
+  });
+
+  test("the same typing begun 1 s after the file opens puts xyz at the start of the line in order", async () => {
+    const { line3, line4, head } = await typeAfterOpen(1000);
+    const shown = JSON.stringify(head);
+    assert.ok(line3.startsWith("xyz    Public Function"), `line 3 reads ${JSON.stringify(line3)}: ${shown}`);
+    assert.equal(line4, "        Dim needleCount As Long", `lines 1 to 5 read ${shown}`);
+  });
+});

From 754922703a16962b66cf1b678248750936f4f8b7 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 23:07:21 +0200
Subject: [PATCH 20/42] Concurrent harness runs share one registry put-back:
 the first records the lists, association and theme in %TEMP%\tb-registry,
 each adds its folders and named projects, and the last to end puts back for
 all (a run's still-open IDE wrote another run's entries back after it tidied,
 exit 3); a dead run's folders are swept by the next; check_tb_registry plays
 out both

---
 WIP.Harness.md                |  18 +++
 scripts/check_tb_registry.mjs |  60 +++++++++-
 scripts/lib/lane-runner.mjs   |  25 +++--
 scripts/lib/tb-registry.mjs   | 204 ++++++++++++++++++++++++++++++----
 4 files changed, 271 insertions(+), 36 deletions(-)

diff --git a/WIP.Harness.md b/WIP.Harness.md
index 59b81da0e..561c85af7 100644
--- a/WIP.Harness.md
+++ b/WIP.Harness.md
@@ -781,6 +781,22 @@ variable left set in a shell would switch tidying off for good. Under `--keep` n
 tidied, because the kept IDE is still writing. `shutdownIde` waits for the IDE's process to
 be gone before anything is tidied, because `taskkill` only asks.
 
+**The last of several runs puts back for all of them.** Two runs at once --- two `ide_test`,
+a `tbrun` beside a lane run, another session's --- cannot each put back on their own. An IDE
+holds the recent list in memory and writes all of it back when it opens a project, so a run
+whose IDE is still open writes the other run's entries back after that run removed them (two
+`ide_test` runs failed with exit 3 this way, each naming the other's lane folder). So the runs
+share one record in `%TEMP%\tb-registry\<key>`, read and written one run at a time under its
+`busy` folder: the first run to start records the recent list, the association and the theme
+(`base.json`); every run adds its folders and named projects (`<pid>-<n>.json`); a run that
+ends while another is running marks its record finished, puts nothing back and gets `{
+deferred: [pids] }` from `finishTidy`, which the lane runner reports instead of checking the
+lists; and the last run to end puts back for all, a named project from its oldest record. A
+record whose process died unfinished is swept by folder when the next run starts alone, and
+its record of the theme and recent list is dropped, since it may be days old.
+`check_tb_registry.mjs` plays out both. `tbbuild --keep` takes no part, so its IDE can still
+write the lists after the last run has put them back.
+
 **Why .NET through PowerShell and not `reg.exe`.** Node has no registry API. `reg.exe`
 prints value names in the console code page when its output is piped, so a path containing a
 character outside that code page (an accented user name in `%TEMP%` is enough) comes back
@@ -1215,6 +1231,8 @@ leave the registry alone, and `finishTidy` once the last has ended. Then it chec
 than trusts: no project-state or recent-list entry may name a lane's folder, a second sweep
 of the remembered build targets must find none, and the add-ins' settings must be as
 recorded. Any failure is exit code 3, which wins over a lane's failure (1): the registry is what to repair.
+While another harness run is still running, the lists and targets are that run's to put back
+and are not checked; the report line says which pid.
 
 **An add-in's own settings are the runner's too.** `SaveSetting` writes under
 `HKCU\Software\VB and VBA Program Settings\<app>`, the same key as any installed copy of the
diff --git a/scripts/check_tb_registry.mjs b/scripts/check_tb_registry.mjs
index f7902dcca..4f269a8e9 100644
--- a/scripts/check_tb_registry.mjs
+++ b/scripts/check_tb_registry.mjs
@@ -43,6 +43,10 @@
 //   * an association that named the temp folder when the run began, which is
 //     another run's IDE copy's and is left alone, against one that did not,
 //     which is put back;
+//   * two runs at once: the one that ends first puts nothing back, the last
+//     one removes both runs' entries, which an IDE wrote back after the first
+//     ended, and gives the user's list back; a run that died is swept by the
+//     next one to start;
 //   * the guards: a key near the root and a sweep outside the temp folder
 //     refused, and an error raised inside PowerShell arriving as a sentence;
 //   * the ownership rule: a dead owner does not block tidying, a live one makes
@@ -50,6 +54,7 @@
 
 import { execFileSync } from "node:child_process";
 import assert from "node:assert/strict";
+import { readdirSync } from "node:fs";
 import { tmpdir } from "node:os";
 import path from "node:path";
 import { fileURLToPath, pathToFileURL } from "node:url";
@@ -331,6 +336,54 @@ try {
   assert.ok(R.finishTidy(clean).association >= 1);
   assert.equal(readValue(COMMAND, ""), REAL, "one that did not is put back");
 
+  // ------------------------------------------------ two runs at once
+  // Run A starts on the user's list; run B starts while A runs and ends first,
+  // so it puts nothing back. A's IDE, still open, writes B's entry back after
+  // that -- the IDE writes its whole list from memory. A ends last and puts
+  // back for both.
+  const RUNS = path.join(tmpdir(), "tbharness-selftest-Łukasz", "tbide");
+  const DIR_A = path.join(RUNS, "9661");
+  const DIR_B = path.join(RUNS, "9662");
+  const IN_A = path.join(DIR_A, "project.twinproj");
+  const IN_B = path.join(DIR_B, "project.twinproj");
+  const RECENT = ROOT + "\\RecentlyOpened";
+  const runsLeft = () => {
+    const lists = R.ideLists({ root: ROOT });
+    return [...lists.projectState, ...lists.recentlyOpened].filter((p) => p?.startsWith(RUNS));
+  };
+  setValues(RECENT, slots([USER, OTHER]));
+  const runA = R.startTidy({ root: ROOT, keys: [ASSOC], prefixes: [DIR_A] });
+  const runB = R.startTidy({ root: ROOT, keys: [ASSOC], prefixes: [DIR_B] });
+  setValues(RECENT, slots([IN_B, IN_A, USER, OTHER]));
+  setValues(ROOT + "\\ProjectState", { [IN_A]: "{}", [IN_B]: "{}" });
+  const deferred = R.finishTidy(runB);
+  assert.deepEqual(deferred, { deferred: [process.pid] }, "a run that ends while another runs puts nothing back");
+  assert.equal(R.finishTidy(runB), deferred, "a second finishTidy returns what the first did");
+  assert.deepEqual(runsLeft().sort(), [IN_A, IN_A, IN_B, IN_B].sort(), "so both runs' entries are still there");
+  const last = R.finishTidy(runA);
+  assert.ok(last && !last.deferred, "the last run to end puts back");
+  assert.deepEqual(runsLeft(), [], "for both runs");
+  assert.deepEqual(
+    R.ideLists({ root: ROOT }).recentlyOpened.filter(Boolean),
+    [USER, OTHER],
+    "the user's list as found",
+  );
+  assert.deepEqual(readdirSync(runA.dir), [], "and the shared record goes");
+  // A run that died: its record is left, and the next run to start alone
+  // deletes what is under its folder.
+  const lib = pathToFileURL(path.join(path.dirname(fileURLToPath(import.meta.url)), "lib", "tb-registry.mjs")).href;
+  const { TB_REGISTRY_OWNER: _, ...noOwner } = process.env;
+  execFileSync(
+    process.execPath,
+    ["-e", `import(${JSON.stringify(lib)}).then(m => m.startTidy(JSON.parse(process.env.TIDY)))`],
+    { env: { ...noOwner, TIDY: JSON.stringify({ root: ROOT, keys: [ASSOC], prefixes: [DIR_B] }) } },
+  );
+  setValues(RECENT, slots([IN_B, USER, OTHER]));
+  setValues(ROOT + "\\ProjectState", { [IN_B]: "{}" });
+  const nextRun = R.startTidy({ root: ROOT, keys: [ASSOC] });
+  assert.deepEqual(runsLeft(), [], "a dead run's entries are deleted by the next run");
+  assert.ok(!R.finishTidy(nextRun).deferred);
+
   // ------------------------------------------------ the guards
   assert.throws(() => R.restoreKeys([{ path: "Software", snap: null }]), /close to the root/);
   assert.throws(() => R.snapshotKeys(["Software\\Classes"]), /close to the root/);
@@ -350,17 +403,18 @@ try {
 
   // ------------------------------------------------ the ownership rule
   // Pid 1 is never a live process on Windows, so it stands for a dead owner.
-  // startTidy with no paths and no prefixes only reads the real IDE keys.
+  // The child defers before it reads anything, so it is given the real keys.
   process.env.TB_REGISTRY_OWNER = "1";
-  assert.ok(R.startTidy(), "a dead owner does not block tidying");
+  const owned = R.startTidy({ root: ROOT, keys: [ASSOC] });
+  assert.ok(owned, "a dead owner does not block tidying");
   assert.equal(process.env.TB_REGISTRY_OWNER, String(process.pid));
-  const lib = pathToFileURL(path.join(path.dirname(fileURLToPath(import.meta.url)), "lib", "tb-registry.mjs")).href;
   const child = execFileSync(
     process.execPath,
     ["-e", `import(${JSON.stringify(lib)}).then(m => console.log(m.startTidy() === null ? "deferred" : "took over"))`],
     { encoding: "utf8", env: process.env },
   ).trim();
   assert.equal(child, "deferred", "a child of a live owner leaves the registry alone");
+  R.finishTidy(owned);
 
   console.log("check_tb_registry: every assertion holds");
 } catch (e) {
diff --git a/scripts/lib/lane-runner.mjs b/scripts/lib/lane-runner.mjs
index 47b6ec793..a0e347287 100644
--- a/scripts/lib/lane-runner.mjs
+++ b/scripts/lib/lane-runner.mjs
@@ -40,7 +40,8 @@
 //     TB_REGISTRY_OWNER and leave it alone. Once every lane has ended it
 //     puts back the IDE's lists, the .twinproj association and the build
 //     targets the IDE remembers, then checks that nothing under the lanes'
-//     folders is left.
+//     folders is left -- unless another harness run is still running, which
+//     then puts back for both.
 //   * THE LANES' SETTINGS. SaveSetting writes under HKCU\Software\VB and VBA
 //     Program Settings\<app>, the same key as any installed copy of the
 //     program that saves it. A lane names the applications its program saves
@@ -374,15 +375,19 @@ export async function runLanes({ tool, suite: SUITE, workDir, defaultPort, usage
     // from what was recorded. Another session's IDE that is open meanwhile
     // can write its own copy of the recent list back, which is the one way an
     // entry could return (WIP.Harness.md).
+    // While another run is still running, the lists and the build targets are
+    // that run's to put back (lib/tb-registry.mjs), so they are not checked.
     const folders = lanes.map((l) => norm(l.work) + "\\");
     try {
-      const lists = ideLists();
-      const left = [...lists.projectState, ...lists.recentlyOpened].filter(
-        (p) => p && folders.some((f) => norm(p).startsWith(f)),
-      );
-      if (left.length) problems.push(`the IDE's lists still name the lanes' folders: ${left.join(", ")}`);
-      const targets = sweepArchitectureMemory(lanes.map((l) => l.work));
-      if (targets) problems.push(`${targets} build target(s) were still remembered for the lanes' folders`);
+      if (!tidied?.deferred) {
+        const lists = ideLists();
+        const left = [...lists.projectState, ...lists.recentlyOpened].filter(
+          (p) => p && folders.some((f) => norm(p).startsWith(f)),
+        );
+        if (left.length) problems.push(`the IDE's lists still name the lanes' folders: ${left.join(", ")}`);
+        const targets = sweepArchitectureMemory(lanes.map((l) => l.work));
+        if (targets) problems.push(`${targets} build target(s) were still remembered for the lanes' folders`);
+      }
       const settingsAfter = snapshotSettings();
       for (let i = 0; i < apps.length; i++) {
         if (JSON.stringify(settingsAfter[i]) !== JSON.stringify(settingsBefore[i])) {
@@ -421,7 +426,9 @@ export async function runLanes({ tool, suite: SUITE, workDir, defaultPort, usage
     const settingsNote = apps.length ? `, and the settings of ${apps.join(", ")} as found` : "";
     return problems.length
       ? `registry and work folders: ${problems.length} problem(s)\n  ${problems.join("\n  ")}`
-      : `registry: put back (${tidied.projectState} project-state, ${tidied.recentlyOpened} recent-list ` +
+      : tidied.deferred
+        ? `registry: left for the run still running to put back (pid ${tidied.deferred.join(", ")})${settingsNote}`
+        : `registry: put back (${tidied.projectState} project-state, ${tidied.recentlyOpened} recent-list ` +
           `and ${tidied.association ?? "no"} association writes); nothing names the lanes' folders${settingsNote}`;
   }
 
diff --git a/scripts/lib/tb-registry.mjs b/scripts/lib/tb-registry.mjs
index 1a016b7c6..d1468f03f 100644
--- a/scripts/lib/tb-registry.mjs
+++ b/scripts/lib/tb-registry.mjs
@@ -44,6 +44,22 @@
 // tbbuild started from it would leave the registry alone too; the owner sweeps
 // once at the end.
 //
+// THE LAST RUN PUTS BACK FOR EVERY RUN. Two runs at once -- two ide_test, or a
+// tbrun beside a lane run -- cannot each put back on their own. An IDE keeps
+// the recent list in memory and writes all of it back when it opens a project,
+// so one run's IDE that is still open writes the other run's entries back after
+// that run removed them, and a put-back from the first run's record would undo
+// what the second run recorded. So the runs share one record, in
+// %TEMP%\tb-registry\<key>: the first run to start writes what it finds
+// (base.json: the recent list, the association keys, the theme), each run adds
+// its own folders and named projects (<pid>-<n>.json), and a run that ends while
+// another is still running only marks its own record finished. The last one to
+// end puts back for all of them, once no IDE of any of them is running. A
+// record whose process ended without finishing is the trace of a run that died:
+// the next run to start alone deletes what is under its folders, and nothing
+// else, since its record of the theme and the recent list may be days old.
+// Runs read and write the folder one at a time, holding its `busy` folder.
+//
 // The work is done by .NET's registry API through PowerShell, and not by
 // reg.exe. reg.exe prints value names in the console code page when its output
 // is piped, so a path with a character outside that code page -- an accented
@@ -55,6 +71,8 @@
 // rather than run as a file, so no execution policy is involved.
 
 import { execFileSync } from "node:child_process";
+import { createHash } from "node:crypto";
+import { existsSync, mkdirSync, readdirSync, readFileSync, rmSync, statSync, writeFileSync } from "node:fs";
 import { tmpdir } from "node:os";
 import path from "node:path";
 
@@ -699,67 +717,205 @@ export function startTidy({ paths = [], prefixes = [], root = IDE_SETTINGS_KEY,
   const owner = Number(process.env.TB_REGISTRY_OWNER);
   if (owner && owner !== process.pid && alive(owner)) return null;
   process.env.TB_REGISTRY_OWNER = String(process.pid);
-  let tidy;
+  const dir = stateDir(root, keys);
+  const tidy = { dir, file: path.join(dir, `${process.pid}-${++records}.json`), root };
   try {
-    if (prefixes.length) restoreProjects({ root, entries: [] }, { prefixes });
-    tidy = { projects: snapshotProjects(paths, { root }), keys: snapshotKeys(keys), prefixes, root };
-    tidy.keysInTemp = namesTempFolder(tidy.keys);
+    return oneAtATime(dir, () => {
+      const others = readRecords(dir);
+      const alone = !others.some((r) => r.live);
+      if (alone) {
+        const dead = [...new Set(others.flatMap((r) => r.prefixes ?? []))];
+        if (dead.length) {
+          restoreProjects({ root, entries: [] }, { prefixes: dead });
+          sweepTargets(dead, root);
+        }
+        for (const r of others) rmSync(r.file, { force: true });
+      }
+      if (alone || !existsSync(path.join(dir, BASE))) {
+        const base = { recent: snapshotProjects([], { root }).recent, keys: snapshotKeys(keys) };
+        base.keysInTemp = namesTempFolder(base.keys);
+        try {
+          base.theme = snapshotTheme({ root });
+        } catch (e) {
+          console.error(`warning: the IDE's theme will not be put back after this run: ${e.message}`);
+          base.theme = null;
+        }
+        writeFileSync(path.join(dir, BASE), JSON.stringify(base));
+      }
+      if (prefixes.length) restoreProjects({ root, entries: [] }, { prefixes });
+      const record = { pid: process.pid, started: Date.now(), prefixes, finished: false };
+      record.projects = snapshotProjects(paths, { root }).entries;
+      sweepTargets(prefixes, root);
+      // After the sweep, so a named project inside a swept folder is not given
+      // back an entry the sweep has just deleted.
+      record.targets = snapshotTargets(paths, root);
+      writeFileSync(tidy.file, JSON.stringify(record));
+      return tidy;
+    });
   } catch (e) {
     console.error(`warning: the IDE's registry entries will not be tidied after this run: ${e.message}`);
     return null;
   }
-  sweepTargets(prefixes, root);
-  // After the sweep, so a named project inside a swept folder is not given back
-  // an entry the sweep has just deleted.
-  tidy.targets = snapshotTargets(paths, root);
-  try {
-    tidy.theme = snapshotTheme({ root });
-  } catch (e) {
-    console.error(`warning: the IDE's theme will not be put back after this run: ${e.message}`);
-    tidy.theme = null;
-  }
-  return tidy;
 }
 
 /**
- * Put the registry back as startTidy found it. Call it only once every IDE of
- * the run has exited -- shutdownIde waits for that.
+ * Put the registry back as startTidy found it, for this run and for every run
+ * that ended while this one was running -- or, while another run is still
+ * running, leave that to the last of them. Call it only once every IDE of the
+ * run has exited -- shutdownIde waits for that. A second call returns what the
+ * first did.
  *
  * @returns {{projectState: number, recentlyOpened: number, association: number,
- *            architecture: number | null, theme: number | null} | null}
+ *            architecture: number | null, theme: number | null}
+ *           | {deferred: number[]} | null} what was written, or the pids of the
+ *           runs still running, one of which will put it back; null on a failure,
+ *           which is warned about
  */
 export function finishTidy(tidy) {
   if (!tidy) return null;
+  if (tidy.done !== undefined) return tidy.done;
+  try {
+    tidy.done = oneAtATime(tidy.dir, () => {
+      const all = readRecords(tidy.dir);
+      const waiting = all.filter((r) => r.live && r.file !== tidy.file);
+      const mine = all.find((r) => r.file === tidy.file);
+      if (mine) writeRecord({ ...mine, finished: true });
+      if (waiting.length) return { deferred: [...new Set(waiting.map((r) => r.pid))] };
+      const done = putBackAll(tidy, all);
+      if (done) {
+        for (const r of all) rmSync(r.file, { force: true });
+        rmSync(path.join(tidy.dir, BASE), { force: true });
+      }
+      return done;
+    });
+  } catch (e) {
+    console.error(`warning: could not tidy the IDE's registry entries after this run: ${e.message}`);
+    tidy.done = null;
+  }
+  return tidy.done;
+}
+
+// What finishTidy does as the last run: every run's folders swept, every
+// run's named projects put back -- the oldest record of a project is the one
+// made before any run touched it -- and the recent list, the association and
+// the theme as the first run found them. Null when the lists could not be put
+// back; the records are then kept, and the next run to start alone sweeps their
+// folders.
+function putBackAll(tidy, all) {
+  let base = null;
+  try {
+    base = JSON.parse(readFileSync(path.join(tidy.dir, BASE), "utf8"));
+  } catch {
+    // no record of how the first run found it: the folders are still swept
+  }
+  const prefixes = [...new Set(all.flatMap((r) => r.prefixes ?? []))];
+  const seen = new Set();
+  const entries = [];
+  for (const e of all.flatMap((r) => r.projects ?? [])) {
+    if (seen.has(norm(e.path))) continue;
+    seen.add(norm(e.path));
+    entries.push(e);
+  }
   let done;
   try {
-    const p = restoreProjects(tidy.projects, { prefixes: tidy.prefixes });
+    const p = restoreProjects({ root: tidy.root, entries, ...(base ? { recent: base.recent } : {}) }, { prefixes });
     // An association that named the temp folder when the run began belonged to
     // another run's copy of the IDE (tb-ide-copy.mjs), which will be deleted:
     // putting it back would point .twinproj files at nothing. It is left as
     // the IDEs set it, and the next IDE started from a real install points it
     // back at that install.
-    if (tidy.keysInTemp) {
+    if (base?.keysInTemp) {
       console.error(
         "note: the .twinproj association pointed into the temp folder when this " +
           "run began, at another run's copy of the IDE, so it is left as it is now",
       );
     }
-    done = { ...p, association: tidy.keysInTemp ? null : restoreKeys(tidy.keys) };
+    done = { ...p, association: !base || base.keysInTemp ? null : restoreKeys(base.keys) };
   } catch (e) {
     console.error(`warning: could not tidy the IDE's registry entries after this run: ${e.message}`);
     return null;
   }
-  const swept = sweepTargets(tidy.prefixes, tidy.root);
-  const restored = restoreTargets(tidy.targets);
+  const swept = sweepTargets(prefixes, tidy.root);
+  // Newest first, so the oldest record of a project is the one left in place.
+  let restored = 0;
+  for (const r of [...all].reverse()) {
+    const n = restoreTargets(r.targets);
+    restored = n === null || restored === null ? null : restored + n;
+  }
   let theme = null;
   try {
-    theme = restoreTheme(tidy.theme);
+    theme = restoreTheme(base?.theme);
   } catch (e) {
     console.error(`warning: could not put back the IDE's theme: ${e.message}`);
   }
   return { ...done, architecture: swept === null || restored === null ? null : swept + restored, theme };
 }
 
+const STATE = path.join(tmpdir(), "tb-registry");
+const BASE = "base.json";
+// A put-back is a few PowerShell starts, seconds at most, so a busy folder this
+// old was left by a run that ended while it held it.
+const BUSY_STALE_MS = 120_000;
+let records = 0;
+
+// The shared record's folder. The self-test's scratch keys get one of their
+// own, so it never joins a real run.
+function stateDir(root, keys) {
+  const key = createHash("sha1")
+    .update([root, ...keys].join("\0"))
+    .digest("hex")
+    .slice(0, 12);
+  return path.join(STATE, key);
+}
+
+// Runs fn while no other run reads or writes the shared record. Synchronous,
+// as startTidy and finishTidy are, so it waits with Atomics.wait.
+function oneAtATime(dir, fn) {
+  mkdirSync(dir, { recursive: true });
+  const busy = path.join(dir, "busy");
+  for (;;) {
+    try {
+      mkdirSync(busy);
+      break;
+    } catch (e) {
+      if (e.code !== "EEXIST") throw e;
+    }
+    try {
+      if (Date.now() - statSync(busy).mtimeMs > BUSY_STALE_MS) rmSync(busy, { recursive: true, force: true });
+    } catch {
+      // removed since
+    }
+    Atomics.wait(new Int32Array(new SharedArrayBuffer(4)), 0, 0, 50);
+  }
+  try {
+    return fn();
+  } finally {
+    rmSync(busy, { recursive: true, force: true });
+  }
+}
+
+// Every run's record, oldest first, with the file it is in and whether its run
+// is still running: not finished, and its process alive. One that will not
+// parse was being written when its run died, and only its file is kept.
+function readRecords(dir) {
+  const out = [];
+  for (const name of readdirSync(dir)) {
+    if (!/^\d+-\d+\.json$/.test(name)) continue;
+    const file = path.join(dir, name);
+    try {
+      const r = JSON.parse(readFileSync(file, "utf8"));
+      out.push({ ...r, file, live: !r.finished && alive(r.pid) });
+    } catch {
+      out.push({ file, live: false, started: 0 });
+    }
+  }
+  return out.sort((a, b) => a.started - b.started);
+}
+
+function writeRecord({ file, live, ...record }) {
+  writeFileSync(file, JSON.stringify(record));
+}
+
 // Whether any value in a key snapshot names a path inside the temp folder.
 function namesTempFolder(snapshot) {
   const tmp = norm(path.resolve(tmpdir())) + "\\";

From a9bbbb507279ecb03ac92aca43d9cb3849df3d63 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 23:15:56 +0200
Subject: [PATCH 21/42] Build is pressed through pressBuild, which waits for
 the page's licenceIsSet and for #appOverlay (lockUICount) to be down, the two
 causes of a lost Build press in a full verify; a failed click saves a picture
 of the page to %TEMP%\tb-click and names it

---
 WIP.Harness.md           | 13 ++++++++++++
 scripts/lib/tb-click.mjs | 38 ++++++++++++++++++++++++++++++++--
 scripts/lib/tb-ide.mjs   | 44 ++++++++++++++++++++++++++++++++++++++--
 scripts/lib/tb-run.mjs   |  5 ++---
 4 files changed, 93 insertions(+), 7 deletions(-)

diff --git a/WIP.Harness.md b/WIP.Harness.md
index 561c85af7..95beb79f4 100644
--- a/WIP.Harness.md
+++ b/WIP.Harness.md
@@ -535,6 +535,19 @@ Rules it follows:
 
 - **`element.click()` on `#buildIcon` does nothing.** It is a plain DIV behind the IDE's own
   pointer handling and needs real `Input.dispatchMouseEvent` presses at its centre.
+- **Build is pressed through `pressBuild` (`tb-ide.mjs`), which waits up to 60 s for the
+  page globals `licenceIsSet` to be true and `lockUICount` to be 0.** `tbBuild_Start` waits
+  only about five seconds for the compiler to answer the licence key's validation, which
+  `afterSocketsAreConnected` resets on every compiler connection, and then writes "[BUILD]
+  failed due to licence error" and builds nothing. `#appOverlay` is a transparent element
+  over the whole page, shown while `lockUICount` is above zero: by every modal dialog, the
+  "Compiling..." and project-loading progress dialogs among them, and by an open menu. A press
+  then fails with "its centre is covered by #appOverlay" (both were seen once each in a full
+  `bug_repro verify`). A licence still unset after the wait throws; an overlay still up is
+  left to `click`, which names it.
+- **A click that fails saves a picture of the page** (`pagePicture` in `tb-click.mjs`, CDP
+  `Page.captureScreenshot`, which works on the private desktop) under `%TEMP%\tb-click\`, and
+  its error names the file.
 - **Read the console's backing array, not the pane.** The DEBUG CONSOLE is a
   `createListView()`, which keeps only the rows that fit in the DOM, so scraping its
   `innerText` returns the *tail* of a long probe and looks exactly like a complete capture
diff --git a/scripts/lib/tb-click.mjs b/scripts/lib/tb-click.mjs
index 8fd94ed75..14d13f051 100644
--- a/scripts/lib/tb-click.mjs
+++ b/scripts/lib/tb-click.mjs
@@ -9,6 +9,9 @@
 // controls ignore a JavaScript click. `#buildIcon`, for one, is a plain DIV
 // wired through the IDE's pointer handling.
 
+import { mkdirSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import path from "node:path";
 import { setTimeout as sleep } from "node:timers/promises";
 
 // ------------------------------------------------------------------ finding
@@ -91,6 +94,36 @@ const SHOWN_JS = `(e) => {
 // aims to the call that reads where the press landed.
 const PRESS = "__tbClickPress";
 
+// Where the page is saved when a click fails: what covers a target is often
+// plain in a picture and hard to put in words, and the IDE runs on a private
+// desktop nobody can look at.
+const PICTURES = path.join(tmpdir(), "tb-click");
+
+/**
+ * Save a picture of the page as it is now, for an error to name: a clause
+ * naming the file, or "" when the page could not be captured within five
+ * seconds. Never throws, so that a failure to capture never hides the failure
+ * it was taken for.
+ */
+export async function pagePicture(c) {
+  try {
+    const shot = c.send("Page.captureScreenshot", { format: "png" });
+    shot.catch(() => {});
+    const { data } = await Promise.race([
+      shot,
+      sleep(5000).then(() => {
+        throw new Error("timed out");
+      }),
+    ]);
+    mkdirSync(PICTURES, { recursive: true });
+    const file = path.join(PICTURES, `${new Date().toISOString().replace(/[:.]/g, "-")}-${process.pid}.png`);
+    writeFileSync(file, Buffer.from(data, "base64"));
+    return `; the page as it was is in ${file}`;
+  } catch {
+    return "";
+  }
+}
+
 /** A real left click at a point: the pointer moves there, presses and releases. */
 export async function clickAt(c, x, y, { clickCount = 1 } = {}) {
   await c.send("Input.dispatchMouseEvent", { type: "mouseMoved", x, y });
@@ -198,12 +231,13 @@ export async function click(c, target, { timeout = 5000, clickCount = 1 } = {})
       if (landed && !landed.hit) {
         throw new Error(
           `cannot click ${named(target)}: the press landed on ${landed.what}; ` +
-            "the target moved, or something covered it, between aiming and pressing",
+            "the target moved, or something covered it, between aiming and pressing" +
+            (await pagePicture(c)),
         );
       }
       return;
     }
-    if (Date.now() >= until) throw new Error(`cannot click ${named(target)}: ${p.error}`);
+    if (Date.now() >= until) throw new Error(`cannot click ${named(target)}: ${p.error}${await pagePicture(c)}`);
     await sleep(100);
   }
 }
diff --git a/scripts/lib/tb-ide.mjs b/scripts/lib/tb-ide.mjs
index ffa6522a7..0dd7a2f64 100644
--- a/scripts/lib/tb-ide.mjs
+++ b/scripts/lib/tb-ide.mjs
@@ -14,7 +14,7 @@ import net from "node:net";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
 import { attach } from "./tb-cdp.mjs";
-import { click } from "./tb-click.mjs";
+import { click, pagePicture } from "./tb-click.mjs";
 import { consoleMark, keepClears, keptClears, linesSince, readConsole } from "./tb-ide-console.mjs";
 import { watchCompiles } from "./tb-wire.mjs";
 
@@ -1047,6 +1047,46 @@ async function buildLines(c, mark, clearsBefore) {
   return [...split(kept[0]).slice(mark.n), ...kept.slice(1).flatMap(split), ...split((await readConsole(c)) ?? "")];
 }
 
+/**
+ * Press the toolbar's Build button once the IDE will take the press.
+ *
+ * Two things in the IDE's page (ide/main.js) make an early press fail. The
+ * licence: tbBuild_Start waits about five seconds for `licenceIsSet`, which is
+ * reset on every connection to the compiler and set when the compiler answers
+ * the key's validation, and then writes "[BUILD] failed due to licence error"
+ * and builds nothing. And #appOverlay: a transparent element over the whole
+ * page, shown while `lockUICount` is above zero, which a modal dialog raises --
+ * the "Compiling..." and project-loading progress dialogs among them -- and an
+ * open menu; the click then finds the button's centre covered. So this waits
+ * up to `timeout` for the licence to be set and the overlay to be down. A
+ * licence still not set then throws, with a picture of the page; an overlay
+ * still up is left to click, whose error names what covers the button and
+ * saves a picture. An IDE without either global is taken to be ready.
+ *
+ * @param {object} c  a tb-cdp connection
+ * @param {object} [o]
+ * @param {number} [o.timeout]  milliseconds (default 60000)
+ */
+export async function pressBuild(c, { timeout = 60 * 1000 } = {}) {
+  const until = Date.now() + timeout;
+  let state;
+  for (;;) {
+    state = await c.evaluate(`({
+      licence: typeof licenceIsSet === "undefined" || licenceIsSet === true,
+      unlocked: typeof lockUICount === "undefined" || !(lockUICount > 0),
+    })`);
+    if ((state.licence && state.unlocked) || Date.now() >= until) break;
+    await sleep(100);
+  }
+  if (!state.licence) {
+    throw new Error(
+      `cannot build: the compiler had not answered the licence key's validation after ` +
+        `${Math.round(timeout / 1000)} s (licenceIsSet is still false)${await pagePicture(c)}`,
+    );
+  }
+  await click(c, "buildIcon");
+}
+
 /**
  * Build the open project, as the toolbar's Build button does, and wait for the
  * build log to say how it went.
@@ -1077,7 +1117,7 @@ export async function buildProject(c, { timeout = 120 * 1000 } = {}) {
   const keeping = await keepClears(c).catch(() => false);
   const clearsBefore = keeping ? ((await keptClears(c)) ?? []).length : 0;
   try {
-    await click(c, "buildIcon");
+    await pressBuild(c);
   } catch (e) {
     return { ok: false, log: [], message: e.message };
   }
diff --git a/scripts/lib/tb-run.mjs b/scripts/lib/tb-run.mjs
index 313550d75..5bd57422c 100644
--- a/scripts/lib/tb-run.mjs
+++ b/scripts/lib/tb-run.mjs
@@ -11,8 +11,7 @@
 // erases the IDE's build log and could erase a failure with it -- so each clear's
 // erasure is kept (keepClears) and read back.
 
-import { click } from "./tb-click.mjs";
-import { BUILD_FAILED } from "./tb-ide.mjs";
+import { BUILD_FAILED, pressBuild } from "./tb-ide.mjs";
 import { keepClears, keptClears, readConsole } from "./tb-ide-console.mjs";
 
 const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
@@ -66,7 +65,7 @@ export async function captureRun(c, { done = () => false, quietMs, timeoutMs })
     );
   }
   // A real press/release pair; element.click() is ignored.
-  await click(c, "buildIcon");
+  await pressBuild(c);
 
   const started = Date.now();
   let last = "",

From 2e086fc31f5c235aabf2cc68b3cb5bc7f719fd01 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 23:36:25 +0200
Subject: [PATCH 22/42] fast-dict-onebuf and fast-array-onebuf no longer name
 shims long deleted: the install flags set for them and the mutual-exclusion
 lines go, and the array shim states why its slots are not encoded

---
 book/lib/fast-array-onebuf.mjs | 14 +++++---------
 book/lib/fast-dict-onebuf.mjs  | 11 +----------
 2 files changed, 6 insertions(+), 19 deletions(-)

diff --git a/book/lib/fast-array-onebuf.mjs b/book/lib/fast-array-onebuf.mjs
index 38cea8a06..12dccc7ec 100644
--- a/book/lib/fast-array-onebuf.mjs
+++ b/book/lib/fast-array-onebuf.mjs
@@ -5,13 +5,10 @@
 // PDFObject references directly. No encoding, no decode on read; the
 // hot path is `arrayMain[start + i]`.
 //
-// Phase 3 of fast-dict-encoded did the same range-view refactor on
-// PDFArray but used a Float64Array + encoded slots (mirroring its
-// dict shape). The encoded backing cost ~300 ms of decodeValue
-// dispatch during save (PDFArray.copyBytesInto iterates ~500 k
-// elements). This shim keeps the heap win (~19 MB on the book by
-// removing each PDFArray's per-instance `this.array = []`) without
-// paying the decode cost: slots are JS references, reads are direct.
+// The heap win (~19 MB on the book) comes from removing each
+// PDFArray's per-instance `this.array = []`. Slots are not encoded,
+// because PDFArray.copyBytesInto reads ~500 k elements during save and
+// a per-slot decode there costs more than the heap it saves.
 //
 // 40-bit packed Number layout (well within Number.MAX_SAFE_INTEGER):
 //   bits  0-23: start  (24 bits, max 16 M slots in arrayMain)
@@ -36,8 +33,7 @@
 // fast-dict-onebuf. The buffer and the context are this shim's own, so
 // it loads without that one.
 //
-// Composes with --fast-dict-onebuf. Mutually exclusive with
-// --fast-dict-encoded (which subsumes both via its own encoded shape).
+// Composes with --fast-dict-onebuf.
 //
 // At load it checks that what it replaces is as in pdf-lib 1.17.1 (see
 // shim-targets.mjs), PDFArray's constructor included, since no instance is
diff --git a/book/lib/fast-dict-onebuf.mjs b/book/lib/fast-dict-onebuf.mjs
index 750abc7b8..97bb82dbe 100644
--- a/book/lib/fast-dict-onebuf.mjs
+++ b/book/lib/fast-dict-onebuf.mjs
@@ -18,7 +18,7 @@
 // onebuf-range.mjs's packing handles.
 //
 // PDFPageLeaf collapses to the same single-`d` field as plain PDFDict;
-// `normalized` and `autoNormalizeCTM` are gettters/setters that mask
+// `normalized` and `autoNormalizeCTM` are getters/setters that mask
 // in/out of `d`'s bits 23 and 24. Heap floor matches `_FastDict` (no
 // separate boolean property slots).
 //
@@ -46,9 +46,6 @@
 // onebuf-range.mjs's, shared with fast-array-onebuf. The buffer and the
 // context are this shim's own, so it loads without that one.
 //
-// Mutually exclusive with --fast-dict-double / --fast-dict-view /
-// --fast-dict-array.
-//
 // At load it checks that what it replaces is as in pdf-lib 1.17.1 (see
 // shim-targets.mjs), the constructors of PDFDict and its three subclasses
 // included, since no instance is built with them; and throws otherwise. It
@@ -512,10 +509,4 @@ if (!PDFDict.prototype.__fastDictOnebufInstalled) {
   };
 
   PDFDict.prototype.__fastDictOnebufInstalled = true;
-  // Mark subsumed shims as installed.
-  PDFDict.prototype.__fastDictDoubleInstalled = true;
-  PDFDict.prototype.__fastDictViewInstalled = true;
-  PDFDict.prototype.__fastDictArrayInstalled = true;
-  PDFDict.prototype.__fastDictIterInstalled = true;
-  PDFObjectParser.prototype.__fastParseDictInstalled = true;
 }

From dee07aefbb4d6c15bb560bb6c01dda075a091695 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 23:37:51 +0200
Subject: [PATCH 23/42] Shim comments state their motivation without
 fast-dict-array, a shim that is gone

---
 book/lib/fast-indirect-objects.mjs |  4 ++--
 book/lib/fast-pdfnumber-pool.mjs   |  4 ++--
 book/render-book.mjs               | 13 ++++---------
 3 files changed, 8 insertions(+), 13 deletions(-)

diff --git a/book/lib/fast-indirect-objects.mjs b/book/lib/fast-indirect-objects.mjs
index f1795d7cc..709834a4f 100644
--- a/book/lib/fast-indirect-objects.mjs
+++ b/book/lib/fast-indirect-objects.mjs
@@ -1,8 +1,8 @@
 // Replace PDFContext.indirectObjects (Map<PDFRef, PDFObject>) with a
 // dense array keyed by objectNumber for the gen=0 path.
 //
-// Motivation. With fast-dict-array applied, the only remaining hot
-// Map.set in the process-phase heap profile is
+// Motivation. Once PDFDict is not Map-backed (fast-dict-onebuf), the
+// only remaining hot Map.set in the process-phase heap profile is
 // PDFContext.assign's `this.indirectObjects.set(ref, object)`:
 //
 //     $ node find-heap-callers.mjs <post-ship>.heapprofile set
diff --git a/book/lib/fast-pdfnumber-pool.mjs b/book/lib/fast-pdfnumber-pool.mjs
index 6ef70c139..4e3600171 100644
--- a/book/lib/fast-pdfnumber-pool.mjs
+++ b/book/lib/fast-pdfnumber-pool.mjs
@@ -1,7 +1,7 @@
 // Pool PDFNumber instances by value.
 //
-// With fast-refs / fast-indirect-objects / fast-dict-array applied,
-// the residual heap profile attributes ~15 MB of self-size to
+// With the other heap shims applied (fast-refs-class,
+// fast-indirect-objects, fast-dict-onebuf), the residual heap profile attributes ~15 MB of self-size to
 // PDFObjectParser.parseNumberOrRef -- mostly inlined `new
 // PDFNumber(value)` calls (each of which also allocates a fresh
 // stringValue via `numberToString(value)`):
diff --git a/book/render-book.mjs b/book/render-book.mjs
index 6870dbd03..377cf70dd 100644
--- a/book/render-book.mjs
+++ b/book/render-book.mjs
@@ -84,15 +84,10 @@ import { exitOnCrash, numberOption, parseCli, printHelpAndExit, withUsageError }
 //     Mutations: in-place replace for existing keys, COW (copy
 //     range to tail, push new pair) for new keys or delete.
 //     PDFContext is a singleton -- one PDFDocument.load per
-//     process; a second distinct context throws. Subsumes
-//     fast-dict-array. Process-phase heap traffic drops from the
-//     Map-backed baseline of ~152 MB down to ~66 MB (-57%); -22%
-//     beyond fast-dict-array. See "One-buffer PDFDict" in
+//     process; a second distinct context throws. Process-phase heap
+//     traffic drops from the Map-backed baseline of ~152 MB to
+//     ~66 MB (-57%). See "One-buffer PDFDict" in
 //     perf/notes/08-pdf-lib.md.
-//
-//     The earlier dict-shape shims it replaced (fast-dict-array,
-//     fast-dict-iter, fast-parse-dict) were deleted; their measurements
-//     are in perf/notes/08-pdf-lib.md, and git history has the code.
 //   fast-parse-object -- replace PDFObjectParser.prototype.parseObject
 //     with a first-byte-dispatch version that gates the three
 //     matchKeyword (true / false / null) scans behind a byte check.
@@ -132,7 +127,7 @@ import { exitOnCrash, numberOption, parseCli, printHelpAndExit, withUsageError }
 //     in step with this shim.
 //   fast-indirect-objects -- replace PDFContext.indirectObjects
 //     (Map<PDFRef, PDFObject>) with a dense array indexed by
-//     objectNumber for the gen=0 path. With fast-dict-array applied,
+//     objectNumber for the gen=0 path. Once PDFDict is not Map-backed,
 //     PDFContext.assign's `this.indirectObjects.set(ref, object)` is
 //     the only hot Map.set left in the heap profile (~7 MB of set
 //     traffic from the parser's once-per-indirect-object assign).

From 15eddeac532acc1c59df92ceb64a2e7e0ecdf3df Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 23:39:06 +0200
Subject: [PATCH 24/42] perf/README no longer lists --fast-refs,
 --fast-dict-iter, --fast-parse-dict and --fast-dict-array, whose shims are
 gone; the bullets that leaned on them stand alone

---
 perf/README.md | 75 +++++++++++++++++---------------------------------
 1 file changed, 26 insertions(+), 49 deletions(-)

diff --git a/perf/README.md b/perf/README.md
index d72dd0545..53897813b 100644
--- a/perf/README.md
+++ b/perf/README.md
@@ -89,31 +89,22 @@ node analyze-profile.mjs results/<label>/process.cpuprofile --top 15
 
 Flag rationale:
 
-- `--fast-refs` -- inject the
-  [book/lib/fast-refs.mjs](../book/lib/fast-refs.mjs) shim:
-  dense-array cache for `PDFRef.of`'s gen=0 path; on miss,
-  constructs the `PDFRef` directly via
-  `Object.create(PDFRef.prototype)` + manual field init, bypassing
-  the upstream `pool.set(tag, instance)` and dropping the
-  per-instance `tag` string (`toString` / `sizeInBytes` /
-  `copyBytesInto` compute from `objectNumber` /
-  `generationNumber` directly). After `--fast-indirect-objects`
-  shipped, the upstream pool was the last hot `Map.set` in the
-  heap profile; this drops the `PDFRef.of` row off the CPU top-15
-  and the `set` builtin row from ~7.5 MB to ~0.5 MB. The
-  tag-drop layer then collapses
-  `parseIndirectObjectHeader` 13.7 MB → 9.3 MB and total process
-  heap 51.9 MB → 45.2 MB (-13 %). **A/B baseline only** since
-  `--fast-refs-class` shipped: the `Object.create + writes`
-  construction style routes V8 through the slow-property path,
-  ending up at ~60 B/instance vs the constructor version's ~44 B.
-  Mutex with `--fast-refs-class` in the harness.
 - `--fast-refs-class` -- inject the
   [book/lib/fast-refs-class.mjs](../book/lib/fast-refs-class.mjs)
-  shipping fix. Same dense-array cache + tag-drop as
-  `--fast-refs`, but PDFRef instances are built via plain-function
-  constructors rather than `Object.create + property writes`. Two
-  shapes: `_FastRef(objectNumber)` for the gen=0 path (one inline
+  shim: a dense-array cache for `PDFRef.of`'s gen=0 path that
+  bypasses the upstream `pool.set(tag, instance)` and drops the
+  per-instance `tag` string (`toString` / `sizeInBytes` /
+  `copyBytesInto` compute from `objectNumber` /
+  `generationNumber` directly). The upstream pool was the last hot
+  `Map.set` in the heap profile once `--fast-indirect-objects`
+  was in place; the shim drops the `PDFRef.of` row off the CPU
+  top-15 and the `set` builtin row from ~7.5 MB to ~0.5 MB. The
+  tag-drop layer collapses `parseIndirectObjectHeader` 13.7 MB →
+  9.3 MB and total process heap 51.9 MB → 45.2 MB (-13 %).
+  PDFRef instances are built via plain-function constructors
+  rather than `Object.create + property writes`, which routes V8
+  through the slow-property path (~60 B/instance against the
+  constructor version's ~44 B). Two shapes: `_FastRef(objectNumber)` for the gen=0 path (one inline
   slot) and `_FastRefGen(objectNumber, generationNumber)` for the
   rare gen!=0 path (two slots, only the xref free entry at
   object 0 on fresh-Chrome workloads). `generationNumber = 0` is a
@@ -175,14 +166,6 @@ Flag rationale:
   trip. Every numeric token parsed during `PDFDocument.load`
   flows through these -- hundreds of thousands of calls per load
   on the book. Production runs through it.
-- `--fast-dict-array` -- inject
-  [book/lib/fast-dict-array.mjs](../book/lib/fast-dict-array.mjs),
-  replacing `PDFDict`'s backing `Map` with a flat alternating
-  `[k0, v0, k1, v1, ...]` array allocated per-dict (pre-sized to 10
-  slots, the median). Was production before `--fast-dict-onebuf`
-  superseded it; kept as an A/B baseline. See "Replace PDFDict's
-  backing Map with a flat array" in
-  [notes/08-pdf-lib.md](notes/08-pdf-lib.md).
 - `--fast-dict-onebuf` -- inject
   [book/lib/fast-dict-onebuf.mjs](../book/lib/fast-dict-onebuf.mjs).
   One long-lived buffer for every committed PDFDict entry across
@@ -207,9 +190,8 @@ Flag rationale:
   `autoNormalizeCTM` as prototype getters/setters that mask in/out
   of bits 23-24. Saves ~20 B/PDFDict × 260 k = ~5.2 MB heap on
   top of the storage refactor, plus ~26 KB on the 1 651 page
-  leaves from the flag-packing. Mutually exclusive with the other
-  dict-shape shims. ~77 % cumulative heap reduction since the
-  original Map-backed PDFDict (152 -> 35 MB). Production runs
+  leaves from the flag-packing. ~77 % cumulative heap reduction
+  against the original Map-backed PDFDict (152 -> 35 MB). Production runs
   through it. See
   [notes/08-pdf-lib.md "One-buffer PDFDict"](notes/08-pdf-lib.md).
 - `--fast-array-onebuf` -- inject
@@ -219,10 +201,10 @@ Flag rationale:
   `arrayMain` JS Array, each PDFArray is a view via packed
   `(start, length)` in `d`. Backing is a plain heterogeneous JS
   Array -- slots hold the original PDFObject references, reads are
-  `arrayMain[start + i]` with no decode. This is the explored-but-
-  didn't-ship Phase 3 encoded approach minus the Float64Array
-  encoding (which cost ~300 ms on save's `copyBytesInto` from
-  per-slot `decodeValue` dispatch). Per-parser `_arrayTemp` for
+  `arrayMain[start + i]` with no decode. The slots are not encoded
+  (for example into a Float64Array): the per-slot decode on save's
+  `copyBytesInto` costs ~300 ms, more than the encoding saves.
+  Per-parser `_arrayTemp` for
   the recursion stack, independent of fast-dict-onebuf's
   `_dictTemp`. Mutations: in-place replace for `set`, in-place
   extend at HWM for `push`, COW for everything else. Singleton
@@ -253,7 +235,7 @@ Flag rationale:
   bound on mainBuf isn't material on its own (~60 K slots out of
   2.4 M) but commits the two-pass shape; Phases 2/3/3β (Float64Array
   mainBuf + encoded slots) were explored and didn't ship. Requires
-  `--fast-dict-onebuf` (mutex-checked). See "Phase 1: pre-size mainBuf
+  `--fast-dict-onebuf` (checked at start-up). See "Phase 1: pre-size mainBuf
   via measure-pass" in
   [notes/08-pdf-lib.md](notes/08-pdf-lib.md).
 - `--fast-parse-object` -- inject
@@ -315,9 +297,9 @@ Flag rationale:
   [book/lib/fast-indirect-objects.mjs](../book/lib/fast-indirect-objects.mjs),
   replacing `PDFContext.indirectObjects` (`Map<PDFRef, PDFObject>`)
   with a dense array indexed by `objectNumber` for the gen=0 path.
-  Mirror of `--fast-refs` on the value side. After `--fast-dict-array`
-  landed, `PDFContext.assign`'s
-  `this.indirectObjects.set(ref, object)` was the only hot
+  Mirror of `fast-refs-class`'s dense gen=0 array on the value side.
+  Once `PDFDict` is not Map-backed, `PDFContext.assign`'s
+  `this.indirectObjects.set(ref, object)` is the only hot
   `Map.set` left in the heap profile (~7 MB of `set` traffic,
   fired once per indirect object during load). Patches `assign` /
   `lookup` / `lookupMaybe` / `delete` / `getObjectRef` /
@@ -645,23 +627,18 @@ run.bat --time-hooks                      # per-task timing of every chunker/pol
 run.bat --incremental                     # process via incremental update instead of pdf-lib roundtrip
 run.bat --chrome-outline                  # let Chrome emit /Outlines (skip parseOutline + setOutline)
 run.bat --tracing                         # capture a hybrid Chrome trace (Blink events + embedded V8 cpu samples)
-run.bat --fast-refs                       # dense-array cache for PDFRef.of's gen=0 path + tag-drop (A/B baseline; production now runs --fast-refs-class)
-run.bat --fast-refs-class                 # --fast-refs + class-constructor PDFRef shape for stable V8 hidden class (also ships; opt-in here for A/B)
+run.bat --fast-refs-class                 # dense-array cache for PDFRef.of's gen=0 path + tag-drop, with class-constructor PDFRef shape for a stable V8 hidden class (also ships; opt-in here for A/B)
 run.bat --parallel-deflate                # parallelSave with objectsPerStream=500 (also ships; opt-in here for A/B)
 run.bat --fast-decode-name                # skip decodeName regex when name has no # (also ships; opt-in here for A/B)
 run.bat --fast-number-to-string           # skip numberToString redundant toString/split when no exponential (also ships; opt-in here for A/B)
 run.bat --fast-size-in-bytes              # non-allocating ladder for xref byte-width (also ships; opt-in here for A/B)
 run.bat --fast-parse-number               # direct-integer accumulator for parseRawNumber/parseRawInt (also ships; opt-in here for A/B)
-run.bat --fast-dict-iter                  # in-place Map.forEach for PDFDict.sizeInBytes/copyBytesInto (Map-shape baseline; production now runs --fast-dict-onebuf)
-run.bat --fast-parse-dict                 # hoist Type/Catalog/Pages/Page sentinel PDFNames out of parseDict (Map-shape baseline; production now runs --fast-dict-onebuf)
-run.bat --fast-dict-array                 # replace PDFDict's backing Map with a per-dict flat [k,v,k,v,...] array; subsumes --fast-dict-iter + --fast-parse-dict (A/B baseline; production now runs --fast-dict-onebuf)
 run.bat --fast-dict-onebuf                # ONE long-lived buffer for all PDFDict entries + small per-parser temp (also ships; opt-in here for A/B)
 run.bat --fast-array-onebuf               # ONE long-lived buffer for all PDFArray elements + small per-parser temp; composes with --fast-dict-onebuf (also ships; opt-in here for A/B)
 run.bat --measure-pass --fast-dict-onebuf # walk rawPdf with the no-allocate measure pass and pre-size --fast-dict-onebuf's mainBuf to the exact dict-slot count (Phase 1 of the two-pass architecture; mutex with --incremental and --render-only)
-run.bat --fast-indirect-objects           # dense-array cache for PDFContext.indirectObjects (gen=0 path); mirror of --fast-refs on the value side (also ships; opt-in here for A/B)
+run.bat --fast-indirect-objects           # dense-array cache for PDFContext.indirectObjects (gen=0 path); mirror of fast-refs-class's dense gen=0 array on the value side (also ships; opt-in here for A/B)
 run.bat --fast-pdfnumber-pool             # value-keyed cache in front of PDFNumber.of; dense array for small ints, Map for the rest (also ships; opt-in here for A/B)
 run.bat --fast-parse-object               # first-byte dispatch in parseObject; gate true/false/null matchKeyword behind byte check (also ships; opt-in here for A/B)
-run.bat --fast-parse-name                 # byte-keyed cache in front of parseName; skip the string build + Map<string, PDFName> hash on the 99.7 % cache-hit path (also ships; opt-in here for A/B)
 run.bat --fast-parse-name                 # byte-keyed cache in front of parseName: skip the string build + Map<string, PDFName> hash on the 99.7 % cache-hit path (also ships; opt-in here for A/B)
 run.bat --fast-sync-load                  # synchronify PDFDocument.load + parser; strip waitForTick machinery (also ships; opt-in here for A/B)
 ```

From ad2ca04e04815fe5e14cf97aefccd8694d275c09 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 23:40:58 +0200
Subject: [PATCH 25/42] check_pdf_shims_equiv fails a patched member missing
 from its shim's checkTargets table: shim-targets.mjs records each shim's
 table and the side asks it (faults shown: a prototype method, a module
 member, a getter and setter)

---
 WIP.md                            |  2 +-
 book/lib/shim-targets.mjs         | 34 +++++++++++++++++++++++++++----
 docs/Documentation/Tools.md       |  6 +++---
 scripts/check_pdf_shims_equiv.mjs | 32 +++++++++++++++++++++--------
 scripts/lib/pdf-shims-side.mjs    | 20 +++++++++++-------
 5 files changed, 70 insertions(+), 24 deletions(-)

diff --git a/WIP.md b/WIP.md
index 4f5081028..104c80ba9 100644
--- a/WIP.md
+++ b/WIP.md
@@ -521,7 +521,7 @@ wrapper:
 | `test.bat` | `test/strftime.test.mjs` | `builder/strftime.mjs`'s `formatDate`, which no build calls because no page sets `last_modified_date`. Run by `node --test` |
 | `test.bat` | `test/example-batches.test.mjs` | `check_examples.mjs`'s probes, from `scripts/lib/example-batches.mjs`: batching, crash isolation through a fake lane, the canaries, the fence classifier and `check_run`'s refusals, expected output, dispatcher and marker reading, with no IDE. Run by `node --test` |
 | `test.bat` | `test/ports.test.mjs` | `scripts/lib/tb-ports.mjs` claims ports as the lane runners need: two claims at once are disjoint, a port in use and a live lock are passed over, a stale lock is taken over, a lock goes when its process exits. Run by `node --test` |
-| `test.bat` | `check_pdf_shims_equiv` | the book's pdf-lib shims write what stock pdf-lib writes: one document written by the gate and one built with `PDFDocument.create` are each saved both ways in child processes, and each pair of files is compared object by object with streams inflated and their cross-reference entries checked; every shim must run, and the members of pdf-lib the shims patch must be those its `PATCHES` lists, each run in one document or the other unless marked there as not reached |
+| `test.bat` | `check_pdf_shims_equiv` | the book's pdf-lib shims write what stock pdf-lib writes: one document written by the gate and one built with `PDFDocument.create` are each saved both ways in child processes, and each pair of files is compared object by object with streams inflated and their cross-reference entries checked; every shim must run, and the members of pdf-lib the shims patch must be those its `PATCHES` lists, each run in one document or the other unless marked there as not reached; each of them must also be in the target table its shim passes to `checkTargets`, which `book/lib/shim-targets.mjs` records for the side to ask |
 | `test.bat` | `check_impexp_parity` | `impexp.mjs` and `impexp.py` pass the same built-in tests, and one sequence of commands through each gives the exit code each command is there for, the same output and the same files. Without Python it reports itself skipped and passes, but fails when `CI=true` |
 | `test.bat` | `check_publish_policy`, `check_gate_lists`, `check_page_baseline`, `check_book_coverage`, `check_axe_patch_equiv` | the gates on the gates |
 
diff --git a/book/lib/shim-targets.mjs b/book/lib/shim-targets.mjs
index 6417e283c..4c17d5654 100644
--- a/book/lib/shim-targets.mjs
+++ b/book/lib/shim-targets.mjs
@@ -25,16 +25,42 @@ export function fingerprint(fn) {
   return createHash("sha256").update(Function.prototype.toString.call(fn)).digest("hex").slice(0, 12);
 }
 
+// Each call's roots and table, by the calling shim's URL, so that
+// scripts/check_pdf_shims_equiv.mjs can ask whether a member a shim patched is
+// in its table (tableCovers). Nothing else reads it.
+const registered = new Map();
+
+// A path such as 'PDFDict.prototype.get', followed from the roots: the object
+// that holds the member, which is undefined if the path leads nowhere, and the
+// member's name.
+function followPath(roots, path) {
+  const names = path.split(".");
+  const key = names.pop();
+  let holder = roots;
+  for (const name of names) holder = holder?.[name];
+  return { names, key, holder };
+}
+
+// Whether the table `shimUrl` gave checkTargets has an entry for `key` of
+// `holder`, whether a fingerprint or ABSENT. It is false for a shim that has
+// not called checkTargets.
+export function tableCovers(shimUrl, holder, key) {
+  const entry = registered.get(shimUrl);
+  if (!entry) return false;
+  return Object.keys(entry.targets).some((path) => {
+    const at = followPath(entry.roots, path);
+    return at.holder === holder && at.key === key;
+  });
+}
+
 // shimUrl is the shim's import.meta.url. roots holds the pdf-lib objects the
 // shim imports, by name; each key of targets is a path from one of them, such
 // as 'PDFDict.prototype.get', and each value is [arity, fingerprint] or ABSENT.
 export function checkTargets(shimUrl, roots, targets) {
+  registered.set(shimUrl, { roots, targets });
   const faults = [];
   for (const [path, expected] of Object.entries(targets)) {
-    const names = path.split(".");
-    const key = names.pop();
-    let holder = roots;
-    for (const name of names) holder = holder?.[name];
+    const { names, key, holder } = followPath(roots, path);
     if (Object(holder) !== holder) {
       faults.push(`${path}: ${names.join(".")} is missing`);
     } else if (expected === ABSENT) {
diff --git a/docs/Documentation/Tools.md b/docs/Documentation/Tools.md
index cd15a8402..03d4612d1 100644
--- a/docs/Documentation/Tools.md
+++ b/docs/Documentation/Tools.md
@@ -91,7 +91,7 @@ The tests the toolchain has to pass. Twenty-one steps, each stopping the run if
 16. [`scripts/check_twin_parsers.mjs`](#check-twin-parsers) --- verifies the scanners of twinBASIC source and of the attribute reference still read the shapes each once misread.
 17. [`scripts/check_attribute_sweep.mjs`](#check-attribute-sweep) --- verifies the logic of the attribute sweep: its site skeletons, how it reads a probe's diagnostics, how it batches probes, and how it compares the answers with `Attributes.md`.
 18. [`scripts/check_cli.mjs`](#check-cli) --- verifies `lib/cli.mjs`, the command-line parser, and each tool's recorded command-line errors.
-19. [`scripts/check_pdf_shims_equiv.mjs`](#check-pdf-shims-equiv) --- verifies the book's pdf-lib shims write what stock pdf-lib writes, patch the members of pdf-lib it lists, and run.
+19. [`scripts/check_pdf_shims_equiv.mjs`](#check-pdf-shims-equiv) --- verifies the book's pdf-lib shims write what stock pdf-lib writes, patch the members of pdf-lib it lists, have each of them in their shim's table of targets, and run.
 20. [`scripts/check_impexp_parity.mjs`](#check-impexp-parity) --- verifies the two editions of the impexp tool pass the same built-in tests, and exit, print and write the same for one sequence of commands. Without Python it reports itself skipped and passes, except in CI.
 21. [`scripts/check_axe_patch_equiv.mjs`](#check-axe-patch-equiv) --- verifies the vendored axe source patch still produces identical colour values.
 
@@ -706,9 +706,9 @@ Exit codes: **0** every probe and recorded case passed, **1** a probe or a recor
 
 Verifies that the book's [pdf-lib patches](Fixes/PDFLib) write what pdf-lib itself writes. `book/render-book.mjs` loads Chromium's PDF, adds the metadata and the outline, and saves it, with a dozen shims replacing pdf-lib's parser, object classes and writer, and `parallelSave` in place of `save()`. This loads, changes and saves one document twice, with stock pdf-lib and with every shim `render-book.mjs` imports, each side in a process of its own, does the same for a document built with `PDFDocument.create`, and compares each pair of files object by object with every stream inflated, since `node:zlib` and pdf-lib's own deflate can compress the same bytes differently. It also checks each file's cross-reference entries against the objects they locate, since pdf-lib's own parser finds objects without them. No built tree, no browser; under a second.
 
-The document is written by the gate, without pdf-lib, so the forms the shims' parsers branch on are known to be in it: names with `#` escapes, numbers in every lexical form, a classic cross-reference table, and an incremental update with an object stream and a cross-reference stream. The change mirrors `render-book.mjs`'s and adds what reaches the rest of the shims: text drawn on a page that has just been given a new key, which moves the page's entries in `fast-dict-onebuf`'s buffer and must keep the page's two flags with them, a page inserted and one removed, objects parsed early and edited late, and a call of each patched method the book does not make, its result written into the document so that the comparison checks it. The created document reaches the factories that build a page tree and a catalog. Each member of pdf-lib that a shim puts a function into is checked against `PATCHES`, a list in the gate. A listed member that is not patched fails it, and so does a patched member that is not listed: a patch applied to a copy of a class leaves pdf-lib's own member as it was. Each listed member's function must run, unless the list marks the member as one neither document reaches and says why, and a marked member that runs fails the gate as well, so the marks stay true. A shim none of whose functions runs is reported whole, since the documents then no longer test it, or the book does not need it. On a difference, that document's shimmed side runs again with each shim alone and with each left out, and the report names the shims that make it.
+The document is written by the gate, without pdf-lib, so the forms the shims' parsers branch on are known to be in it: names with `#` escapes, numbers in every lexical form, a classic cross-reference table, and an incremental update with an object stream and a cross-reference stream. The change mirrors `render-book.mjs`'s and adds what reaches the rest of the shims: text drawn on a page that has just been given a new key, which moves the page's entries in `fast-dict-onebuf`'s buffer and must keep the page's two flags with them, a page inserted and one removed, objects parsed early and edited late, and a call of each patched method the book does not make, its result written into the document so that the comparison checks it. The created document reaches the factories that build a page tree and a catalog. Each member of pdf-lib that a shim puts a function into is checked against `PATCHES`, a list in the gate. A listed member that is not patched fails it, and so does a patched member that is not listed: a patch applied to a copy of a class leaves pdf-lib's own member as it was. Each listed member's function must run, unless the list marks the member as one neither document reaches and says why, and a marked member that runs fails the gate as well, so the marks stay true. A shim none of whose functions runs is reported whole, since the documents then no longer test it, or the book does not need it. Each patched member must also be in the table of targets its shim passes to `checkTargets` (`book/lib/shim-targets.mjs`), the check that stops the import when pdf-lib's own version of a member changes: a patch whose member is missing from the table would let a pdf-lib update change it unnoticed, so the gate fails and names the shim and the member. On a difference, that document's shimmed side runs again with each shim alone and with each left out, and the report names the shims that make it.
 
-Exit codes: **0** the shims write what stock pdf-lib writes, and every shim and patched member is reached and as listed; **1** a pair of files differs, a shim or patched member is no longer reached, or a patched member is not as listed; **2** the check could not run: a refused command line, a failure of the check itself, or a crash.
+Exit codes: **0** the shims write what stock pdf-lib writes, and every shim and patched member is reached, as listed and in its shim's table; **1** a pair of files differs, a shim or patched member is no longer reached, or a patched member is not as listed or not in its shim's table; **2** the check could not run: a refused command line, a failure of the check itself, or a crash.
 
 ### check_impexp_parity.mjs
 {: #check-impexp-parity }
diff --git a/scripts/check_pdf_shims_equiv.mjs b/scripts/check_pdf_shims_equiv.mjs
index 700aaec1e..3557d1adc 100644
--- a/scripts/check_pdf_shims_equiv.mjs
+++ b/scripts/check_pdf_shims_equiv.mjs
@@ -28,7 +28,11 @@
 // no longer test it, or that the book never needed it. So is each member of
 // pdf-lib the shims put a function into, against PATCHES below: a member
 // listed there and not patched, one patched and not listed, one whose function
-// ran in neither document, and one marked there as not reached that ran.
+// ran in neither document, and one marked there as not reached that ran. Each
+// patched member must also be in the target table its shim gives checkTargets
+// (book/lib/shim-targets.mjs), which is what stops the import when pdf-lib's
+// own version of the member changes; shim-targets.mjs records each shim's
+// table, and the side asks it.
 //
 // On a difference, that document's shimmed side is run again with each shim
 // alone and with each left out (parallelSave counts as one), to name the shims
@@ -36,9 +40,9 @@
 //
 //     node scripts/check_pdf_shims_equiv.mjs
 //
-// Exit codes: 0 the same, 1 a difference, a shim or patched member not reached
-// or a patched member not as PATCHES lists it, 2 a refused command line, a failure of
-// the check itself, or a crash.
+// Exit codes: 0 the same, 1 a difference, a shim or patched member not reached,
+// a patched member not as PATCHES lists it or missing from its shim's target
+// table, 2 a refused command line, a failure of the check itself, or a crash.
 
 import { spawn } from "node:child_process";
 import { mkdtempSync, readFileSync, rmSync, writeFileSync } from "node:fs";
@@ -59,13 +63,13 @@ if (cli.stopped === "help") {
 Loads, changes and saves one PDF with stock pdf-lib and with the book's pdf-lib
 shims, and creates and saves another, compares each pair of files object by
 object, streams inflated, and checks the members of pdf-lib the shims patch
-against the list in this file.
+against the list in this file and against each shim's table of what it replaces.
 
 Exit codes:
   0  the shims write what stock pdf-lib writes, and every shim and patched member
-     is reached and as listed
+     is reached, as listed and in its shim's table
   1  a pair of files differs, a shim or patched member is no longer reached, or a
-     patched member is not as listed
+     patched member is not as listed or not in its shim's table
   2  the check could not run: a refused command line, a failure of the check
      itself, or a crash`);
 }
@@ -205,6 +209,7 @@ function againstPatches(patched, unreached) {
       .map((p) => `${shimName(p.shim)}: ${p.member}`)
       .filter((key) => !seen.get(key).ran && listed.get(key) === null && !quiet(key)),
     nowRun: [...seen.keys()].filter((key) => seen.get(key).ran && listed.get(key)),
+    untabled: [...seen.entries()].filter(([, p]) => !p.tabled).map(([key]) => key),
   };
 }
 
@@ -604,7 +609,11 @@ try {
   const patched = ok ? mergePatched(shimmedSides) : null;
   const members = ok ? againstPatches(patched, unreached) : null;
   const faults = members
-    ? members.missing.length + members.unlisted.length + members.notRun.length + members.nowRun.length
+    ? members.missing.length +
+      members.unlisted.length +
+      members.notRun.length +
+      members.nowRun.length +
+      members.untabled.length
     : 0;
   const [loaded, created] = documents;
 
@@ -612,7 +621,7 @@ try {
     console.log(
       `${TOOL}: stock pdf-lib and ${shims.length} shims with parallelSave write the same ${loaded.stock.objects.size} objects ` +
         `for a loaded document and the same ${created.stock.objects.size} for a created one; ` +
-        `the ${patched.length} members the shims patch are as listed, and all ran but the ${members.marked} marked`,
+        `the ${patched.length} members the shims patch are as listed and every one is in its shim's target table, and all ran but the ${members.marked} marked`,
     );
   } else {
     for (const document of documents.filter((d) => d.found.length)) {
@@ -657,6 +666,11 @@ try {
         "The documents no longer reach the function, or the book does not need it; PATCHES can mark it, with the reason.",
       );
       report(members.nowRun, "member(s) PATCHES marks as not reached ran", "Remove the mark from PATCHES.");
+      report(
+        members.untabled,
+        "patched member(s) are not in their shim's target table",
+        "Add each to the table the shim passes to checkTargets, with its arity and fingerprint, or ABSENT for a member pdf-lib does not have.",
+      );
     }
     process.exitCode = 1;
   }
diff --git a/scripts/lib/pdf-shims-side.mjs b/scripts/lib/pdf-shims-side.mjs
index 9c81818af..419a23ed1 100644
--- a/scripts/lib/pdf-shims-side.mjs
+++ b/scripts/lib/pdf-shims-side.mjs
@@ -75,7 +75,7 @@ function snapshot(holders) {
 }
 
 // The functions the holders hold now and did not hold in `before`, each with
-// the members that hold it.
+// the members that hold it, as { label, holder, key }.
 function installedSince(holders, before) {
   const installed = new Map();
   for (const [obj, label] of holders) {
@@ -89,7 +89,8 @@ function installedSince(holders, before) {
       ]) {
         const fn = now[part];
         if (typeof fn !== "function" || was.get(key)?.[part] === fn) continue;
-        installed.set(fn, [...(installed.get(fn) ?? []), `${label(String(key))}${suffix}`]);
+        const member = { label: `${label(String(key))}${suffix}`, holder: obj, key: String(key) };
+        installed.set(fn, [...(installed.get(fn) ?? []), member]);
       }
     }
   }
@@ -97,9 +98,10 @@ function installedSince(holders, before) {
 }
 
 // Each member that holds an installed function a shim defines, as
-// { shim, member, ran }. The inspector gives each function's position; its
-// coverage entry is the one at that position whose source is the function's
-// own.
+// { shim, member, ran, tabled }, where `tabled` is whether the shim's own
+// target table (book/lib/shim-targets.mjs) has an entry for that member. The
+// inspector gives each function's position; its coverage entry is the one at
+// that position whose source is the function's own.
 async function patchedMembers(coverage, installed, shimUrls) {
   const scripts = new Map(coverage.map((s) => [s.scriptId, s]));
   const fns = [...installed.keys()];
@@ -118,7 +120,7 @@ async function patchedMembers(coverage, installed, shimUrls) {
     const members = installed.get(fn);
     const { internalProperties = [] } = await session.post("Runtime.getProperties", { objectId: item.value.objectId });
     const at = internalProperties.find((p) => p.name === "[[FunctionLocation]]")?.value.value;
-    if (!at) throw new Error(`the inspector gives no position for ${members[0]}`);
+    if (!at) throw new Error(`the inspector gives no position for ${members[0].label}`);
     const script = scripts.get(at.scriptId);
     if (!script || !shimUrls.has(script.url)) continue;
     if (!sources.has(at.scriptId)) {
@@ -137,7 +139,10 @@ async function patchedMembers(coverage, installed, shimUrls) {
     // A function never called may never have been compiled, and then the
     // coverage has no entry for it at all.
     const ran = entry !== undefined && entry.ranges[0].count > 0;
-    for (const member of members) patched.push({ shim: fileURLToPath(script.url), member, ran });
+    for (const { label, holder, key } of members) {
+      const tabled = tableCovers(script.url, holder, key);
+      patched.push({ shim: fileURLToPath(script.url), member: label, ran, tabled });
+    }
   }
   return patched;
 }
@@ -158,6 +163,7 @@ if (job.coverage) {
   await session.post("Profiler.startPreciseCoverage", { callCount: true, detailed: false });
 }
 
+const { tableCovers } = await import(bookLib("shim-targets.mjs"));
 const pdfLib = await import("pdf-lib");
 const holders = session ? pdfLibHolders() : null;
 const before = holders && snapshot(holders);

From 1f6d5040b15e914fa61c6defa45f2fe523f674d2 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 23:48:03 +0200
Subject: [PATCH 26/42] MDIForm's BackColor stores a value that is not a colour
 as the other surfaces do (997, 995; VB6 raises 380): WARNING on its page; the
 forecolor reproducer, its VB6 side and BUGS entry widened with it

---
 BUGS-TO-REPORT.md                             |   8 ++-
 .../forecolor-invalid-value-stored.twinproj   | Bin 11199 -> 13243 bytes
 .../forecolor-invalid-value-stored/repro.json |   4 +-
 .../src/Sources/MyMDIForm.tbform              |  59 ++++++++++++++++++
 .../src/Sources/MyMDIForm.twin                |   9 +++
 .../src/Sources/Startup.twin                  |   8 +++
 .../vb6/MDIForm1.frm                          |  16 +++++
 .../vb6/Module1.bas                           |   8 +++
 .../vb6/Probe.vbp                             |   1 +
 docs/Reference/Default/VB/MDIForm/index.md    |   3 +
 10 files changed, 113 insertions(+), 3 deletions(-)
 create mode 100644 bugs/forecolor-invalid-value-stored/src/Sources/MyMDIForm.tbform
 create mode 100644 bugs/forecolor-invalid-value-stored/src/Sources/MyMDIForm.twin
 create mode 100644 bugs/forecolor-invalid-value-stored/vb6/MDIForm1.frm

diff --git a/BUGS-TO-REPORT.md b/BUGS-TO-REPORT.md
index ff6e01eb7..a1f67eabd 100644
--- a/BUGS-TO-REPORT.md
+++ b/BUGS-TO-REPORT.md
@@ -1432,7 +1432,7 @@ Assigning a value that is not a colour to a colour property does not leave the p
 
 **To Reproduce**
 Steps to reproduce the behavior:
-1. Open `forecolor-invalid-value-stored.twinproj` (attached as `forecolor-invalid-value-stored.zip`). Its `Sub Main` loads `Form1`, which holds a PictureBox, a Label, a TextBox, a CommandButton and a user control, UC1, whose `RunCases` assigns its own colour properties. For each property tried it sets `vbGreen`, then assigns `-1` (and `&H8000001F` to the form's `ForeColor`) under `On Error Resume Next` and prints the error number and the value read back. The Printer lines need a default printer; nothing is printed.
+1. Open `forecolor-invalid-value-stored.twinproj` (attached as `forecolor-invalid-value-stored.zip`). Its `Sub Main` loads `Form1`, which holds a PictureBox, a Label, a TextBox, a CommandButton and a user control, UC1, whose `RunCases` assigns its own colour properties; it then loads `MyMDIForm`, an MDIForm. For each property tried it sets `vbGreen`, then assigns `-1` (and `&H8000001F` to the form's `ForeColor`) under `On Error Resume Next` and prints the error number and the value read back. The Printer lines need a default printer; nothing is printed.
 2. Run it (F5) and read the DEBUG CONSOLE:
    ```
    Form.ForeColor = -1: Err 5, reads FFFFFFFF
@@ -1452,6 +1452,8 @@ Steps to reproduce the behavior:
    UserControl.ForeColor = -1: Err 5, reads FFFFFFFF
    UserControl.BackColor = -1: Err 0, reads FFFFFFFF
    UserControl.FillColor = -1: Err 0, reads FFFFFFFF
+   MDIForm.BackColor = -1: Err 0, reads FFFFFFFF
+   MDIForm.BackColor = &H8000001F: Err 0, reads 8000001F
    ```
 
 **Expected behavior**
@@ -1474,6 +1476,8 @@ Printer.FillColor = -1: Err 380, reads FF00
 UserControl.ForeColor = -1: Err 380, reads FF00
 UserControl.BackColor = -1: Err 380, reads FF00
 UserControl.FillColor = -1: Err 380, reads FF00
+MDIForm.BackColor = -1: Err 380, reads FF00
+MDIForm.BackColor = &H8000001F: Err 380, reads FF00
 ```
 `FF00` is `vbGreen`, which each property held before the assignment. A program that sets a colour from user input and handles the error then keeps the colour it had.
 
@@ -1486,7 +1490,7 @@ Severity: low. `ForeColor` raises the error on the surfaces and the other proper
 
 What was tried: the same lines on BETA 983 print the same, so this is not a change of BETA 984. A value that is a valid colour, such as `&H100FF00` or `&H20000FF`, is accepted by `ForeColor` with no error, as in VB6. Besides the attached project, each of `-1`, `&H8000001F` and `&HFF0000FF` was assigned to every colour property of a UserControl (placed on the form), CheckBox, Frame, ListBox, Shape, ComboBox, DirListBox, DriveListBox, FileListBox, OptionButton and OLE in a project of its own, on BETA 995 and 983 and in VB6: the results are the same as above, error 5 for the UserControl's `ForeColor` and none for the rest in twinBASIC, error 380 and the old value kept in VB6. The twinBASIC-only controls behave the same (`QRCode.ForeColor` raises error 5, `CheckMark.BackColor` and `MultiFrame.BackColor` raise nothing), and so do `CommandButton.ForeColor` and the Data control's colours, which VB6 has no counterpart or no loadable project for. The package source explains the pattern: the colour properties are plain stored fields (`Public ForeColor As OLE_COLOR` and so on, in `GraphicsBase` for Form, PictureBox, UserControl, PropertyPage and Report, and declared again in each control), with nothing that validates the value; the error 5 comes from the `ForeColor` change handler of `GraphicsBase`, which runs after the value is stored.
 
-<!-- Reproducer: bugs/forecolor-invalid-value-stored/ (mode run, expects the seventeen lines above in twinBASIC); verified on 995 and 983. The VB6 project is in bugs/forecolor-invalid-value-stored/vb6/ (`bug_repro.mjs vb6 forecolor-invalid-value-stored` prints the seventeen lines above). The wider sweep (every colour property of the classes named under "What was tried", three values each, on 995, 983 and VB6) is in .claude/tooling-review-scratch/beta995-probes/s73/colours/ (c4.out995.txt, c4.out983.txt, c5.outvb6.txt, c6.Data.outvb6.txt, c3.out*.txt for the UserControl), local scratch files that are not in the repository. Stated in a WARNING naming BETA 995 under each of the colour properties on the pages under docs/Reference/Default/VB/ for: Form, PictureBox, UserControl, PropertyPage, Report, Printer, Label, TextBox, CommandButton, CheckBox, OptionButton, Frame, ListBox, ComboBox, DirListBox, DriveListBox, FileListBox, Shape, OLE (the VB6 comparison is in the WARNING) and Data, CheckMark, MultiFrame, QRCode (twinBASIC behaviour only; CommandButton.ForeColor likewise). PropertyPage and Report were not run: they inherit GraphicsBase, as Form does. MDIForm carries none: its BackColor assigns a separate field and its ForeColor and FillColor raise an unsupported-property error, and none was run. When fixed, remove each WARNING. -->
+<!-- Reproducer: bugs/forecolor-invalid-value-stored/ (mode run, expects the nineteen lines above in twinBASIC); verified on 995 and 983, and the two MDIForm lines on 997 and 995. The VB6 project is in bugs/forecolor-invalid-value-stored/vb6/ (`bug_repro.mjs vb6 forecolor-invalid-value-stored` prints the nineteen lines above). The wider sweep (every colour property of the classes named under "What was tried", three values each, on 995, 983 and VB6) is in .claude/tooling-review-scratch/beta995-probes/s73/colours/ (c4.out995.txt, c4.out983.txt, c5.outvb6.txt, c6.Data.outvb6.txt, c3.out*.txt for the UserControl), local scratch files that are not in the repository. Stated in a WARNING naming BETA 995 under each of the colour properties on the pages under docs/Reference/Default/VB/ for: Form, PictureBox, UserControl, PropertyPage, Report, Printer, Label, TextBox, CommandButton, CheckBox, OptionButton, Frame, ListBox, ComboBox, DirListBox, DriveListBox, FileListBox, Shape, OLE (the VB6 comparison is in the WARNING), MDIForm (BackColor only; its WARNING names BETA 997) and Data, CheckMark, MultiFrame, QRCode (twinBASIC behaviour only; CommandButton.ForeColor likewise). PropertyPage and Report were not run: they inherit GraphicsBase, as Form does. MDIForm's BackColor was run on 997 and 995 and stores the value; its ForeColor and FillColor are not on its interface (being checked separately). When fixed, remove each WARNING. -->
 
 ---
 
diff --git a/bugs/forecolor-invalid-value-stored/forecolor-invalid-value-stored.twinproj b/bugs/forecolor-invalid-value-stored/forecolor-invalid-value-stored.twinproj
index b1d28aab96c9b8283746b8b928a0edb12810dceb..f105a3297508a3249a488459306097a05e7aa414 100644
GIT binary patch
delta 916
zcmZ8g&u<bz6kce7utHgB8bd9xS!0tL#6>F9AMsGIDG6IiijruIF6;o4Zg&U_g~k~D
z6HMOCix=a)=}{Bo&HqBrdg?{J>CCQ-+s<J(@0;&??|pCIerkQ_z5W`A9DVy0TT>)S
zG7gPuZHo-|^R(S%uOP$3X@n%{u^fF4vA`wxl3KmE+b5GsAKTUtIod6i4#y}bN2A)N
z*@4gL#azjaD&~M<!U<XnI~JK}E_}~1+cvUhI;hRvjdC%s{uGoz_N9pK56ljxhm2a#
zbyw_?nq***5oK`Kv`1d)ZG?M$4&5jhT;?{i2NmK_G^MpF!##bi<2B^9QgbXcWp`IS
zNgZ{0hM=B<-*YREcpG)>?6GpV!*FM8+iq&ZoQiT@T86Z+Mf;+Tft|Ay><9{cPnW9(
zIY4|8Od|%kWA5`<6Q9HDa|iVZ#U@2fLhQCV9L+SKhcswpLNWiK;C-eDKQhb8kl6O7
zpM4Nk74K7ws;Fy@ZK~zqZ8&?4TWy*>mR6W#u36~WJ3DYV38xmh<{=(op9Q!RSynhc
zb9%FIJqP_r8a`$z{E1wc=T6~@YRJX)LP;+bi=_g*QdcAYwhxZfrTO)(vJTJW44d@}
z`H9TeFd!|kr<h8fPOx)oMc=?iycZP&co%O3OY!5M@y@x+Dm!&zTB^8?%N*lJKyW^p
z@##+z|9cuFH+(lMOR6toss)iF&-Q;0%89ku>}PTToVe{%Fun4?u}}4LyqmI<e*tb)
B{jC51

delta 33
pcmdm;zCV1zeMZ)e55DtE78Q|Ys^H#iB9hEK*<6QzbBbcP5CG?L3$FkG

diff --git a/bugs/forecolor-invalid-value-stored/repro.json b/bugs/forecolor-invalid-value-stored/repro.json
index 5af787d28..412b2f428 100644
--- a/bugs/forecolor-invalid-value-stored/repro.json
+++ b/bugs/forecolor-invalid-value-stored/repro.json
@@ -19,7 +19,9 @@
       "^Printer\\.FillColor = -1: Err 0, reads FFFFFFFF$",
       "^UserControl\\.ForeColor = -1: Err 5, reads FFFFFFFF$",
       "^UserControl\\.BackColor = -1: Err 0, reads FFFFFFFF$",
-      "^UserControl\\.FillColor = -1: Err 0, reads FFFFFFFF$"
+      "^UserControl\\.FillColor = -1: Err 0, reads FFFFFFFF$",
+      "^MDIForm\\.BackColor = -1: Err 0, reads FFFFFFFF$",
+      "^MDIForm\\.BackColor = &H8000001F: Err 0, reads 8000001F$"
     ]
   }
 }
diff --git a/bugs/forecolor-invalid-value-stored/src/Sources/MyMDIForm.tbform b/bugs/forecolor-invalid-value-stored/src/Sources/MyMDIForm.tbform
new file mode 100644
index 000000000..ee1b08e6c
--- /dev/null
+++ b/bugs/forecolor-invalid-value-stored/src/Sources/MyMDIForm.tbform
@@ -0,0 +1,59 @@
+[
+	{
+		"AlwaysShowKeyboardCues": false,
+		"Appearance": "vbAppear3d",
+		"AutoShowChildren": true,
+		"BackColor": -2147483636,
+		"Caption": "Window",
+		"Enabled": true,
+		"FormDesignerId": "{EAEAEAEA-EAEA-EAEA-EAEA-EAEAEAEAEA01}",
+		"Form_AlwaysShowKeyboardCues": false,
+		"Form_Opacity": 100,
+		"Form_TopMost": false,
+		"Height": 571,
+		"HelpContextID": 0,
+		"Icon": "",
+		"Index": -1,
+		"Left": 0,
+		"LinkMode": "vbLinkNone",
+		"LinkTopic": null,
+		"MaxHeight": 0,
+		"MaxWidth": 0,
+		"MinHeight": 0,
+		"MinWidth": 0,
+		"MouseIcon": "",
+		"MousePointer": "vbDefault",
+		"Moveable": true,
+		"Name": "MyMDIForm",
+		"NegotiateToolbars": true,
+		"OLEDropMode": "vbOLEDropNone",
+		"Opacity": 100,
+		"Picture": "",
+		"PictureDpiScaling": true,
+		"RightToLeft": false,
+		"ScrollBars": true,
+		"StartUpPosition": "vbStartUpWindowsDefault",
+		"TabFocusAutoSelect": false,
+		"Tag": null,
+		"Top": 0,
+		"TopMost": false,
+		"TransparencyKey": -1,
+		"Visible": true,
+		"WhatsThisHelp": false,
+		"Width": 912,
+		"WindowState": "vbNormal",
+		"__IDEOptions": {
+			"alignToGrid": false,
+			"gridHeight": 10,
+			"gridWidth": 10,
+			"lockedControls": [],
+			"multiColoredGrabbers": true,
+			"showGrid": true,
+			"showOutlines": false
+		},
+		"__lastUpdateMarker": 3416063361,
+		"_children": [],
+		"_className": "MDIForm",
+		"_clsid": "{33AD4F70-6699-11CF-B70C-00AA0060D393}"
+	}
+]
diff --git a/bugs/forecolor-invalid-value-stored/src/Sources/MyMDIForm.twin b/bugs/forecolor-invalid-value-stored/src/Sources/MyMDIForm.twin
new file mode 100644
index 000000000..b241aaeff
--- /dev/null
+++ b/bugs/forecolor-invalid-value-stored/src/Sources/MyMDIForm.twin
@@ -0,0 +1,9 @@
+[Description("")]
+[FormDesignerId("EAEAEAEA-EAEA-EAEA-EAEA-EAEAEAEAEA01")]
+[PredeclaredId]
+Class MyMDIForm
+
+    Sub New()
+    End Sub
+
+End Class
diff --git a/bugs/forecolor-invalid-value-stored/src/Sources/Startup.twin b/bugs/forecolor-invalid-value-stored/src/Sources/Startup.twin
index 006430f0b..2484dfc07 100644
--- a/bugs/forecolor-invalid-value-stored/src/Sources/Startup.twin
+++ b/bugs/forecolor-invalid-value-stored/src/Sources/Startup.twin
@@ -47,6 +47,14 @@ Module Startup
         Debug.Print "Printer.FillColor = -1: Err " & Err.Number & ", reads " & Hex$(Printer.FillColor): Err.Clear
         Form1.UC1.RunCases
         Unload Form1
+        Load MyMDIForm
+        MyMDIForm.BackColor = vbGreen
+        MyMDIForm.BackColor = -1
+        Debug.Print "MDIForm.BackColor = -1: Err " & Err.Number & ", reads " & Hex$(MyMDIForm.BackColor): Err.Clear
+        MyMDIForm.BackColor = vbGreen
+        MyMDIForm.BackColor = &H8000001F
+        Debug.Print "MDIForm.BackColor = &H8000001F: Err " & Err.Number & ", reads " & Hex$(MyMDIForm.BackColor): Err.Clear
+        Unload MyMDIForm
     End Sub
 
 End Module
diff --git a/bugs/forecolor-invalid-value-stored/vb6/MDIForm1.frm b/bugs/forecolor-invalid-value-stored/vb6/MDIForm1.frm
new file mode 100644
index 000000000..b922d4917
--- /dev/null
+++ b/bugs/forecolor-invalid-value-stored/vb6/MDIForm1.frm
@@ -0,0 +1,16 @@
+VERSION 5.00
+Begin VB.MDIForm MDIForm1
+   Caption         =   "MDIForm1"
+   ClientHeight    =   3000
+   ClientLeft      =   60
+   ClientTop       =   345
+   ClientWidth     =   4000
+   LinkTopic       =   "MDIForm1"
+   StartUpPosition =   3  'Windows Default
+End
+Attribute VB_Name = "MDIForm1"
+Attribute VB_GlobalNameSpace = False
+Attribute VB_Creatable = False
+Attribute VB_PredeclaredId = True
+Attribute VB_Exposed = False
+Option Explicit
diff --git a/bugs/forecolor-invalid-value-stored/vb6/Module1.bas b/bugs/forecolor-invalid-value-stored/vb6/Module1.bas
index 05057c104..55b39d1d9 100644
--- a/bugs/forecolor-invalid-value-stored/vb6/Module1.bas
+++ b/bugs/forecolor-invalid-value-stored/vb6/Module1.bas
@@ -50,6 +50,14 @@ Private Sub Cases()
     Print #9, "Printer.FillColor = -1: Err " & Err.Number & ", reads " & Hex$(Printer.FillColor): Err.Clear
     Form1.UC1.RunCases
     Unload Form1
+    Load MDIForm1
+    MDIForm1.BackColor = vbGreen
+    MDIForm1.BackColor = -1
+    Print #9, "MDIForm.BackColor = -1: Err " & Err.Number & ", reads " & Hex$(MDIForm1.BackColor): Err.Clear
+    MDIForm1.BackColor = vbGreen
+    MDIForm1.BackColor = &H8000001F
+    Print #9, "MDIForm.BackColor = &H8000001F: Err " & Err.Number & ", reads " & Hex$(MDIForm1.BackColor): Err.Clear
+    Unload MDIForm1
 End Sub
 
 Sub Main()
diff --git a/bugs/forecolor-invalid-value-stored/vb6/Probe.vbp b/bugs/forecolor-invalid-value-stored/vb6/Probe.vbp
index f2be8429f..950884b68 100644
--- a/bugs/forecolor-invalid-value-stored/vb6/Probe.vbp
+++ b/bugs/forecolor-invalid-value-stored/vb6/Probe.vbp
@@ -1,5 +1,6 @@
 Type=Exe
 Form=Form1.frm
+Form=MDIForm1.frm
 UserControl=UC1.ctl
 Module=Module1; Module1.bas
 Startup="Sub Main"
diff --git a/docs/Reference/Default/VB/MDIForm/index.md b/docs/Reference/Default/VB/MDIForm/index.md
index d9ff6c25c..e9b03ec14 100644
--- a/docs/Reference/Default/VB/MDIForm/index.md
+++ b/docs/Reference/Default/VB/MDIForm/index.md
@@ -157,6 +157,9 @@ When **True** (default), loading an MDI child class also shows it; when **False*
 
 The colour painted in the MDI client area, as an **OLE_COLOR**. Defaults to the system **vbApplicationWorkspace** colour. Used as the canvas behind [**Picture**](#picture) and behind every MDI child's title bar and outer border.
 
+> [!WARNING]
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+
 ### Caption
 {: .no_toc }
 

From 97cc667054732cf3bdbba7f7637156019553aa3b Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Mon, 5 Oct 2026 23:50:44 +0200
Subject: [PATCH 27/42] BUGS entry and reproducer: a [RunAfterBuild] Sub does
 not run when its module holds a procedure named like the module (997, 983;
 VB6 allows the name); the RunAfterBuild WARNING says so

---
 BUGS-TO-REPORT.md                             |  50 +++++++++++++-
 bugs/sub-named-like-module/repro.json         |  13 ++++
 bugs/sub-named-like-module/src/Settings       |  61 ++++++++++++++++++
 .../src/Sources/Probe.twin                    |  13 ++++
 .../src/Sources/Startup.twin                  |   6 ++
 .../sub-named-like-module.twinproj            | Bin 0 -> 2443 bytes
 bugs/sub-named-like-module/vb6/Module1.bas    |  24 +++++++
 bugs/sub-named-like-module/vb6/Probe.vbp      |   7 ++
 docs/Reference/Attributes.md                  |   2 +
 9 files changed, 175 insertions(+), 1 deletion(-)
 create mode 100644 bugs/sub-named-like-module/repro.json
 create mode 100644 bugs/sub-named-like-module/src/Settings
 create mode 100644 bugs/sub-named-like-module/src/Sources/Probe.twin
 create mode 100644 bugs/sub-named-like-module/src/Sources/Startup.twin
 create mode 100644 bugs/sub-named-like-module/sub-named-like-module.twinproj
 create mode 100644 bugs/sub-named-like-module/vb6/Module1.bas
 create mode 100644 bugs/sub-named-like-module/vb6/Probe.vbp

diff --git a/BUGS-TO-REPORT.md b/BUGS-TO-REPORT.md
index a1f67eabd..aa9530fa5 100644
--- a/BUGS-TO-REPORT.md
+++ b/BUGS-TO-REPORT.md
@@ -1691,7 +1691,55 @@ What reproduces it besides the plain case: the clash in another letter case, suc
 
 Severity: moderate. A `[RunAfterBuild]` Sub runs after the exe is built, for example to sign it, and here it is skipped while the build reports success. Nothing points at the module's name as the cause, so the project's owner has to find it by renaming modules.
 
-<!-- Reproducer: bugs/module-named-like-project/ (mode run, exe true; expects exit 5, the console's `[BUILD] Executing 'ModuleNamedLikeProject.ModuleNamedLikeProject.<Sub>'...` line, and no `RunAfterBuild ran`); verified on BETA 995 and 997 by `bug_repro.mjs verify`, with a copy whose module is named Runner as the control (exit 0, `RunAfterBuild ran`, verify says NO LONGER REPRODUCES). `bug_repro.mjs run` needs --exe by hand, because a project may hold one [RunAfterBuild] (TB5114) and this one's own is the subject; verify takes exe from repro.json. The harness wraps the Sub, so run's console names `tbrun_RunProbe`; a build in the IDE names the Sub itself. Steps 3 and 4 were checked on BETA 995 and 997 by building the reproducer, and a copy with the module named Runner, with `tbbuild --build --keep` and reading the DEBUG CONSOLE. The other-case and empty-module variants were checked on BETA 995 and 997 in scratch trees that are not in the reproducer. VB6: `bug_repro.mjs vb6 module-named-like-project` prints the refusal; the empty-module form was built in a scratch copy. docs/Reference/Attributes.md (#runafterbuild) carries a WARNING callout for this; once a fixed build is released, it becomes a NOTE saying since which build. WIP.ExamplesBuild.md (the bullet "No generated module may be named like the project") and scripts/check_examples.mjs (the comment on its three collision rules) state the rule for generated modules; they called the clash an ambiguous call that the IDE refuses at execution time, and were corrected with this entry. When fixed: say in both since which build the rule is no longer needed, or remove it. -->
+<!-- Reproducer: bugs/module-named-like-project/ (mode run, exe true; expects exit 5, the console's `[BUILD] Executing 'ModuleNamedLikeProject.ModuleNamedLikeProject.<Sub>'...` line, and no `RunAfterBuild ran`); verified on BETA 995 and 997 by `bug_repro.mjs verify`, with a copy whose module is named Runner as the control (exit 0, `RunAfterBuild ran`, verify says NO LONGER REPRODUCES). `bug_repro.mjs run` needs --exe by hand, because a project may hold one [RunAfterBuild] (TB5114) and this one's own is the subject; verify takes exe from repro.json. The harness wraps the Sub, so run's console names `tbrun_RunProbe`; a build in the IDE names the Sub itself. Steps 3 and 4 were checked on BETA 995 and 997 by building the reproducer, and a copy with the module named Runner, with `tbbuild --build --keep` and reading the DEBUG CONSOLE. The other-case and empty-module variants were checked on BETA 995 and 997 in scratch trees that are not in the reproducer. VB6: `bug_repro.mjs vb6 module-named-like-project` prints the refusal; the empty-module form was built in a scratch copy. docs/Reference/Attributes.md (#runafterbuild) carries a WARNING callout for this; once a fixed build is released, its sentences about the module's name go. WIP.ExamplesBuild.md (the bullet "No generated module may be named like the project") and scripts/check_examples.mjs (the comment on its three collision rules) state the rule for generated modules; they called the clash an ambiguous call that the IDE refuses at execution time, and were corrected with this entry. When fixed: say in both since which build the rule is no longer needed, or remove it. -->
+
+---
+
+## A `[RunAfterBuild]` Sub does not run, and nothing says so, when its module holds a procedure named like the module
+
+**Describe the bug**
+When a module holds a procedure with the same name as the module, a `[RunAfterBuild]` Sub in that module does not run, and nothing says so. The build succeeds and the exe is written. The DEBUG CONSOLE's last line is `[BUILD] Executing '<project>.<module>.<Sub>'...`, and nothing follows it: no message box, no entry in the error panel, no diagnostic. Not even the first statement of the Sub runs. The names are compared without regard to letter case, so `Runner` and `runner` clash. A Sub, a Function and a `Private` Sub all cause it, and the procedure does not have to be called. Observed in the DEBUG CONSOLE after pressing Build.
+
+This is a sibling of "A `[RunAfterBuild]` Sub does not run, and nothing says so, when a module is named like the project". There the module and the project share a name; here the project's name plays no part, and the clash is inside one module.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `sub-named-like-module.twinproj` (attached as `sub-named-like-module.zip`). The project is named `SubNamedLikeModule`. It has a `Startup` module with an empty `Sub Main`, and this module:
+   ```
+   Module Probe
+       [RunAfterBuild]
+       Public Sub Hello()
+           Debug.Cls
+           Debug.Print "RunAfterBuild ran"
+       End Sub
+
+       Public Sub Probe()
+       End Sub
+   End Module
+   ```
+2. Build the project.
+3. Read the DEBUG CONSOLE. It ends at `[BUILD] Executing 'SubNamedLikeModule.Probe.Hello'...`. `RunAfterBuild ran` is never printed.
+4. Rename `Sub Probe` to `NotProbe`, or move it to another module, and build again. The console is cleared and holds `RunAfterBuild ran`.
+
+**Expected behavior**
+The Sub runs whatever the other procedures in its module are called, as it does once `Probe` is renamed. If a procedure may not have its module's name, the compiler should refuse it with an error, and not build the project and skip the Sub in silence. Writing `Probe.Probe` in code is already refused, with TB5027.
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 997
+
+**Additional context**
+Also on BETA 983, identically, so this is not a recent regression.
+
+VB6 accepts the name. A project named `SubNamedLikeModule` with a standard module `Probe` (`Attribute VB_Name = "Probe"`) that holds `Public Sub Probe()` builds, and `Sub Main` calls `Probe` and it runs (the project is attached as `sub-named-like-module-vb6.zip`; it printed `Sub Probe ran, in a module named Probe`). VB6 has no `[RunAfterBuild]`, so what is checked is that the module and the Sub can coexist.
+
+What does not reproduce it: a procedure with another name, such as `NotProbe`. A procedure named like a module, when the module that holds it is a different one from the module that holds the `[RunAfterBuild]` Sub (a `Runner` module holding the Sub, and an `Other` module holding `Sub Other`).
+
+What reproduces it besides the plain case: a `Function Probe`, a `Private Sub Probe`, and the clash in another letter case (`Module Runner` with `Sub runner`). The failure needs no help from any tool: the Sub is the one marked `[RunAfterBuild]`, and its body never starts.
+
+Severity: moderate. A `[RunAfterBuild]` Sub runs after the exe is built, for example to sign it, and here it is skipped while the build reports success. Nothing points at the clash as the cause, so the project's owner has to find it by renaming procedures.
+
+<!-- Reproducer: bugs/sub-named-like-module/ (mode run, exe true; expects exit 5, the console's `[BUILD] Executing 'SubNamedLikeModule.Probe.<Sub>'...` line, and no `RunAfterBuild ran`); verified on BETA 997 by `bug_repro.mjs verify` (reproduces, run exit 5), with a scratch copy whose Sub is named NotProbe as the control (exit 0, `RunAfterBuild ran`, verify says NO LONGER REPRODUCES); the copy was removed from bugs/ afterwards. `bug_repro.mjs run` needs --exe by hand, because a project may hold one [RunAfterBuild] (TB5114) and this one's own is the subject; verify takes exe from repro.json. The harness wraps the Sub in a Sub of its own appended to the same module, so run's console names `tbrun_RunProbe`; a build in the IDE names the Sub itself. The wrapper is not needed: a tree whose attribute the wrapper does not match (`[Description("x")] [RunAfterBuild]` on one line) fails the same way, and a marker file written by the Sub's first statement is not written. The scratch trees for the Function, Private Sub, other-case, other-module and BETA 983 variants are not in the reproducer; the variants were checked on BETA 997, the plain case and its no-wrapper form on BETA 983 as well. VB6: `bug_repro.mjs vb6 sub-named-like-module` prints `Sub Probe ran, in a module named Probe` and `Sub Main ran`. Related entry: "A `[RunAfterBuild]` Sub does not run, and nothing says so, when a module is named like the project" (bugs/module-named-like-project/); the two may share one cause, a name lookup that finds the module where it wants the procedure. docs/Reference/Attributes.md (#runafterbuild) carries this in the same WARNING callout as that entry; once a fixed build is released, its sentences about a procedure named like its module go. -->
 
 ---
 
diff --git a/bugs/sub-named-like-module/repro.json b/bugs/sub-named-like-module/repro.json
new file mode 100644
index 000000000..4f1682ddb
--- /dev/null
+++ b/bugs/sub-named-like-module/repro.json
@@ -0,0 +1,13 @@
+{
+  "mode": "run",
+  "exe": true,
+  "expect": {
+    "exit": 5,
+    "output": [
+      "^\\[BUILD\\] Executing 'SubNamedLikeModule\\.Probe\\.\\w+'\\.\\.\\.$"
+    ],
+    "absent": [
+      "^RunAfterBuild ran$"
+    ]
+  }
+}
diff --git a/bugs/sub-named-like-module/src/Settings b/bugs/sub-named-like-module/src/Settings
new file mode 100644
index 000000000..fb3a4cbc7
--- /dev/null
+++ b/bugs/sub-named-like-module/src/Settings
@@ -0,0 +1,61 @@
+{
+	"configuration.inherits": "Defaults",
+	"project.appTitle": "SubNamedLikeModule",
+	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
+	"project.buildType": "Standard EXE",
+	"project.description": "Reproduces: A [RunAfterBuild] Sub does not run, and nothing says so, when its module holds a procedure named like the module",
+	"project.exportPathIsV2": true,
+	"project.id": "{FA93C97C-3E20-473A-A1C5-06C4F673AB54}",
+	"project.name": "SubNamedLikeModule",
+	"project.optionExplicit": true,
+	"project.references": [
+		{
+			"id": "{00020430-0000-0000-C000-000000000046}",
+			"lcid": 0,
+			"name": "OLE Automation",
+			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
+			"path64": "C:\\Windows\\System32\\stdole2.tlb",
+			"symbolId": "stdole",
+			"versionMajor": 2,
+			"versionMinor": 0
+		},
+		{
+			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "VB",
+			"versionBuild": 0,
+			"versionMajor": 0,
+			"versionMinor": 0,
+			"versionRevision": 31
+		},
+		{
+			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "AppGlobalClassProject",
+			"versionBuild": 0,
+			"versionMajor": 1,
+			"versionMinor": 0,
+			"versionRevision": 0
+		}
+	],
+	"project.settingsVersion": 1,
+	"project.startupObject": "Sub Main",
+	"project.warnings": {
+		"errors": [],
+		"hints": [],
+		"ignored": [],
+		"info": [],
+		"warnings": []
+	},
+	"runtime.useUnicodeStandardLibrary": true
+}
diff --git a/bugs/sub-named-like-module/src/Sources/Probe.twin b/bugs/sub-named-like-module/src/Sources/Probe.twin
new file mode 100644
index 000000000..0b8b86b66
--- /dev/null
+++ b/bugs/sub-named-like-module/src/Sources/Probe.twin
@@ -0,0 +1,13 @@
+Module Probe
+
+    [RunAfterBuild]
+    Public Sub Hello()
+        Debug.Cls
+        Debug.Print "RunAfterBuild ran"
+    End Sub
+
+    ' Never called. Its name is the module's name.
+    Public Sub Probe()
+    End Sub
+
+End Module
diff --git a/bugs/sub-named-like-module/src/Sources/Startup.twin b/bugs/sub-named-like-module/src/Sources/Startup.twin
new file mode 100644
index 000000000..20233b3a9
--- /dev/null
+++ b/bugs/sub-named-like-module/src/Sources/Startup.twin
@@ -0,0 +1,6 @@
+Module Startup
+
+    Public Sub Main()
+    End Sub
+
+End Module
diff --git a/bugs/sub-named-like-module/sub-named-like-module.twinproj b/bugs/sub-named-like-module/sub-named-like-module.twinproj
new file mode 100644
index 0000000000000000000000000000000000000000..a44afff9144465167f8221f51633d9cf54d85de2
GIT binary patch
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diff --git a/bugs/sub-named-like-module/vb6/Module1.bas b/bugs/sub-named-like-module/vb6/Module1.bas
new file mode 100644
index 000000000..c51ae261d
--- /dev/null
+++ b/bugs/sub-named-like-module/vb6/Module1.bas
@@ -0,0 +1,24 @@
+Attribute VB_Name = "Probe"
+Option Explicit
+
+' The VB6 side of the reproducer: a standard module named Probe that holds a
+' Sub named Probe. VB6 has no [RunAfterBuild], so what is checked is whether it
+' accepts the name, and whether the Sub can be called.
+' Build and run it with:  node scripts/bug_repro.mjs vb6 sub-named-like-module
+
+Public Sub Probe()
+    Print #9, "Sub Probe ran, in a module named Probe"
+End Sub
+
+Sub Main()
+    On Error GoTo Fail
+    Open App.Path & "\out.txt" For Output As #9
+    Probe
+    Print #9, "Sub Main ran"
+    Close #9
+    Exit Sub
+Fail:
+    On Error Resume Next
+    Print #9, "unhandled error " & Err.Number & ": " & Err.Description
+    Close #9
+End Sub
diff --git a/bugs/sub-named-like-module/vb6/Probe.vbp b/bugs/sub-named-like-module/vb6/Probe.vbp
new file mode 100644
index 000000000..33a0347fc
--- /dev/null
+++ b/bugs/sub-named-like-module/vb6/Probe.vbp
@@ -0,0 +1,7 @@
+Type=Exe
+Module=Probe; Module1.bas
+Startup="Sub Main"
+ExeName32="Probe.exe"
+Name="SubNamedLikeModule"
+CompilationType=0
+OptimizationType=0
diff --git a/docs/Reference/Attributes.md b/docs/Reference/Attributes.md
index 3e0d20f3a..3fb3d2f39 100644
--- a/docs/Reference/Attributes.md
+++ b/docs/Reference/Attributes.md
@@ -955,6 +955,8 @@ Only one **[RunAfterBuild]** is allowed per project. A second one is a compile e
 
 > [!WARNING]
 > BETA 995 and 997 have a defect: when a module has the project's name, in any letter case, the **[RunAfterBuild]** procedure does not run, and nothing says so. The build succeeds, and the DEBUG CONSOLE ends at its `[BUILD] Executing '...'` line. An empty module of that name stops it as well, when the procedure is in another module. VB6 refuses a module of the project's name. Do not give a module the project's name.
+>
+> BETA 997 has a second defect of the same kind: when the module that holds the **[RunAfterBuild]** procedure also holds a procedure with the module's own name, in any letter case, such as a `Sub Probe` in a module `Probe`, the procedure does not run, and nothing says so. The other procedure does not have to be called. VB6 allows a procedure named like its module. Do not give a procedure the name of the module that holds it.
 
 ## RunBeforeStartupObject
 {: #runbeforestartupobject }

From b39a373b29d2d06846a3c0213b7a76a1826db7b8 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Tue, 6 Oct 2026 00:03:47 +0200
Subject: [PATCH 28/42] MDIForm: the forecolor reproducer's MDIForm gets a
 FormDesignerId of its own (it had Form1's, so its lines tested Form1); a real
 MDIForm stores an invalid BackColor with no error while loaded and error 5
 once shown; the page's Differences from Form says what twinBASIC does
 (compile error, 380/438 through As Form) and documents Refresh, PrintForm and
 Point

---
 BUGS-TO-REPORT.md                             |   8 +++-
 add-in/Resources/SYMBOLS/symbols.json         |   3 ++
 .../forecolor-invalid-value-stored.twinproj   | Bin 13243 -> 13679 bytes
 .../forecolor-invalid-value-stored/repro.json |   4 +-
 .../src/Sources/MyMDIForm.tbform              |   2 +-
 .../src/Sources/MyMDIForm.twin                |   2 +-
 .../src/Sources/Startup.twin                  |   7 ++++
 .../vb6/Module1.bas                           |   7 ++++
 builder/symbol-baseline.json                  |   3 ++
 docs/Reference/Default/VB/MDIForm/index.md    |  37 +++++++++++++++---
 10 files changed, 62 insertions(+), 11 deletions(-)

diff --git a/BUGS-TO-REPORT.md b/BUGS-TO-REPORT.md
index aa9530fa5..775f97ce2 100644
--- a/BUGS-TO-REPORT.md
+++ b/BUGS-TO-REPORT.md
@@ -1432,7 +1432,7 @@ Assigning a value that is not a colour to a colour property does not leave the p
 
 **To Reproduce**
 Steps to reproduce the behavior:
-1. Open `forecolor-invalid-value-stored.twinproj` (attached as `forecolor-invalid-value-stored.zip`). Its `Sub Main` loads `Form1`, which holds a PictureBox, a Label, a TextBox, a CommandButton and a user control, UC1, whose `RunCases` assigns its own colour properties; it then loads `MyMDIForm`, an MDIForm. For each property tried it sets `vbGreen`, then assigns `-1` (and `&H8000001F` to the form's `ForeColor`) under `On Error Resume Next` and prints the error number and the value read back. The Printer lines need a default printer; nothing is printed.
+1. Open `forecolor-invalid-value-stored.twinproj` (attached as `forecolor-invalid-value-stored.zip`). Its `Sub Main` loads `Form1`, which holds a PictureBox, a Label, a TextBox, a CommandButton and a user control, UC1, whose `RunCases` assigns its own colour properties; it then loads `MyMDIForm`, an MDIForm, assigns the same values to its `BackColor`, shows it and assigns them again. For each property tried it sets `vbGreen`, then assigns `-1` (and `&H8000001F` to the form's `ForeColor`) under `On Error Resume Next` and prints the error number and the value read back. The Printer lines need a default printer; nothing is printed.
 2. Run it (F5) and read the DEBUG CONSOLE:
    ```
    Form.ForeColor = -1: Err 5, reads FFFFFFFF
@@ -1454,6 +1454,8 @@ Steps to reproduce the behavior:
    UserControl.FillColor = -1: Err 0, reads FFFFFFFF
    MDIForm.BackColor = -1: Err 0, reads FFFFFFFF
    MDIForm.BackColor = &H8000001F: Err 0, reads 8000001F
+   MDIForm (shown).BackColor = -1: Err 5, reads FFFFFFFF
+   MDIForm (shown).BackColor = &H8000001F: Err 5, reads 8000001F
    ```
 
 **Expected behavior**
@@ -1478,6 +1480,8 @@ UserControl.BackColor = -1: Err 380, reads FF00
 UserControl.FillColor = -1: Err 380, reads FF00
 MDIForm.BackColor = -1: Err 380, reads FF00
 MDIForm.BackColor = &H8000001F: Err 380, reads FF00
+MDIForm (shown).BackColor = -1: Err 380, reads FF00
+MDIForm (shown).BackColor = &H8000001F: Err 380, reads FF00
 ```
 `FF00` is `vbGreen`, which each property held before the assignment. A program that sets a colour from user input and handles the error then keeps the colour it had.
 
@@ -1490,7 +1494,7 @@ Severity: low. `ForeColor` raises the error on the surfaces and the other proper
 
 What was tried: the same lines on BETA 983 print the same, so this is not a change of BETA 984. A value that is a valid colour, such as `&H100FF00` or `&H20000FF`, is accepted by `ForeColor` with no error, as in VB6. Besides the attached project, each of `-1`, `&H8000001F` and `&HFF0000FF` was assigned to every colour property of a UserControl (placed on the form), CheckBox, Frame, ListBox, Shape, ComboBox, DirListBox, DriveListBox, FileListBox, OptionButton and OLE in a project of its own, on BETA 995 and 983 and in VB6: the results are the same as above, error 5 for the UserControl's `ForeColor` and none for the rest in twinBASIC, error 380 and the old value kept in VB6. The twinBASIC-only controls behave the same (`QRCode.ForeColor` raises error 5, `CheckMark.BackColor` and `MultiFrame.BackColor` raise nothing), and so do `CommandButton.ForeColor` and the Data control's colours, which VB6 has no counterpart or no loadable project for. The package source explains the pattern: the colour properties are plain stored fields (`Public ForeColor As OLE_COLOR` and so on, in `GraphicsBase` for Form, PictureBox, UserControl, PropertyPage and Report, and declared again in each control), with nothing that validates the value; the error 5 comes from the `ForeColor` change handler of `GraphicsBase`, which runs after the value is stored.
 
-<!-- Reproducer: bugs/forecolor-invalid-value-stored/ (mode run, expects the nineteen lines above in twinBASIC); verified on 995 and 983, and the two MDIForm lines on 997 and 995. The VB6 project is in bugs/forecolor-invalid-value-stored/vb6/ (`bug_repro.mjs vb6 forecolor-invalid-value-stored` prints the nineteen lines above). The wider sweep (every colour property of the classes named under "What was tried", three values each, on 995, 983 and VB6) is in .claude/tooling-review-scratch/beta995-probes/s73/colours/ (c4.out995.txt, c4.out983.txt, c5.outvb6.txt, c6.Data.outvb6.txt, c3.out*.txt for the UserControl), local scratch files that are not in the repository. Stated in a WARNING naming BETA 995 under each of the colour properties on the pages under docs/Reference/Default/VB/ for: Form, PictureBox, UserControl, PropertyPage, Report, Printer, Label, TextBox, CommandButton, CheckBox, OptionButton, Frame, ListBox, ComboBox, DirListBox, DriveListBox, FileListBox, Shape, OLE (the VB6 comparison is in the WARNING), MDIForm (BackColor only; its WARNING names BETA 997) and Data, CheckMark, MultiFrame, QRCode (twinBASIC behaviour only; CommandButton.ForeColor likewise). PropertyPage and Report were not run: they inherit GraphicsBase, as Form does. MDIForm's BackColor was run on 997 and 995 and stores the value; its ForeColor and FillColor are not on its interface (being checked separately). When fixed, remove each WARNING. -->
+<!-- Reproducer: bugs/forecolor-invalid-value-stored/ (mode run, expects the twenty-one lines above in twinBASIC); verified on 995 and 983 for the first seventeen lines, and the four MDIForm lines were run on 997 (MyMDIForm needs a FormDesignerId of its own: given Form1's, its lines test Form1). The VB6 project is in bugs/forecolor-invalid-value-stored/vb6/ (`bug_repro.mjs vb6 forecolor-invalid-value-stored` prints the twenty-one lines above). The wider sweep (every colour property of the classes named under "What was tried", three values each, on 995, 983 and VB6) is in .claude/tooling-review-scratch/beta995-probes/s73/colours/ (c4.out995.txt, c4.out983.txt, c5.outvb6.txt, c6.Data.outvb6.txt, c3.out*.txt for the UserControl), local scratch files that are not in the repository. Stated in a WARNING naming BETA 995 under each of the colour properties on the pages under docs/Reference/Default/VB/ for: Form, PictureBox, UserControl, PropertyPage, Report, Printer, Label, TextBox, CommandButton, CheckBox, OptionButton, Frame, ListBox, ComboBox, DirListBox, DriveListBox, FileListBox, Shape, OLE (the VB6 comparison is in the WARNING), MDIForm (BackColor only; its WARNING names BETA 997) and Data, CheckMark, MultiFrame, QRCode (twinBASIC behaviour only; CommandButton.ForeColor likewise). PropertyPage and Report were not run: they inherit GraphicsBase, as Form does. MDIForm's BackColor was run on 997 with a real MDIForm and stores the value, raising no error while the form is only loaded and error 5 once it is shown; its ForeColor and FillColor are not on its interface (a compile error early-bound; 380 through As Form). When fixed, remove each WARNING. -->
 
 ---
 
diff --git a/add-in/Resources/SYMBOLS/symbols.json b/add-in/Resources/SYMBOLS/symbols.json
index ffa3e528c..f8904872f 100644
--- a/add-in/Resources/SYMBOLS/symbols.json
+++ b/add-in/Resources/SYMBOLS/symbols.json
@@ -2446,8 +2446,11 @@
     {"name":"Opacity","package":"VB","container":"MDIForm","kind":"property","url":"/tB/Packages/VB/MDIForm/#opacity"},
     {"name":"Picture","package":"VB","container":"MDIForm","kind":"property","url":"/tB/Packages/VB/MDIForm/#picture"},
     {"name":"PictureDpiScaling","package":"VB","container":"MDIForm","kind":"property","url":"/tB/Packages/VB/MDIForm/#picturedpiscaling"},
+    {"name":"Point","package":"VB","container":"MDIForm","kind":"method","url":"/tB/Packages/VB/MDIForm/#point"},
     {"name":"PopUpMenu","package":"VB","container":"MDIForm","kind":"method","url":"/tB/Packages/VB/MDIForm/#popupmenu"},
+    {"name":"PrintForm","package":"VB","container":"MDIForm","kind":"method","url":"/tB/Packages/VB/MDIForm/#printform"},
     {"name":"QueryUnload","package":"VB","container":"MDIForm","kind":"event","url":"/tB/Packages/VB/MDIForm/#queryunload"},
+    {"name":"Refresh","package":"VB","container":"MDIForm","kind":"method","url":"/tB/Packages/VB/MDIForm/#refresh"},
     {"name":"Resize","package":"VB","container":"MDIForm","kind":"event","url":"/tB/Packages/VB/MDIForm/#resize"},
     {"name":"RightToLeft","package":"VB","container":"MDIForm","kind":"property","url":"/tB/Packages/VB/MDIForm/#righttoleft"},
     {"name":"ScaleHeight","package":"VB","container":"MDIForm","kind":"property","url":"/tB/Packages/VB/MDIForm/#scaleheight"},
diff --git a/bugs/forecolor-invalid-value-stored/forecolor-invalid-value-stored.twinproj b/bugs/forecolor-invalid-value-stored/forecolor-invalid-value-stored.twinproj
index f105a3297508a3249a488459306097a05e7aa414..e0fa6e3405ef5955195e6872aeda57a6975872b8 100644
GIT binary patch
delta 80
zcmdm;{yuBNT|P#m&G-23u`n7<-YZ<n^onn@i3m6E<XiGwEWsK1<&!VSD@;BoB?uHS
b<518j1`6eAP8Lu&hTtqz5a0Y(;hYcv<Ut+s

delta 35
rcmaE#wL5*oT|P#`&G-23u}p5_m7RQ3IFiYXce9BIH}B@pN;N_N6ZQ>{

diff --git a/bugs/forecolor-invalid-value-stored/repro.json b/bugs/forecolor-invalid-value-stored/repro.json
index 412b2f428..d8ab2da25 100644
--- a/bugs/forecolor-invalid-value-stored/repro.json
+++ b/bugs/forecolor-invalid-value-stored/repro.json
@@ -21,7 +21,9 @@
       "^UserControl\\.BackColor = -1: Err 0, reads FFFFFFFF$",
       "^UserControl\\.FillColor = -1: Err 0, reads FFFFFFFF$",
       "^MDIForm\\.BackColor = -1: Err 0, reads FFFFFFFF$",
-      "^MDIForm\\.BackColor = &H8000001F: Err 0, reads 8000001F$"
+      "^MDIForm\\.BackColor = &H8000001F: Err 0, reads 8000001F$",
+      "^MDIForm \\(shown\\)\\.BackColor = -1: Err 5, reads FFFFFFFF$",
+      "^MDIForm \\(shown\\)\\.BackColor = &H8000001F: Err 5, reads 8000001F$"
     ]
   }
 }
diff --git a/bugs/forecolor-invalid-value-stored/src/Sources/MyMDIForm.tbform b/bugs/forecolor-invalid-value-stored/src/Sources/MyMDIForm.tbform
index ee1b08e6c..904a66f2f 100644
--- a/bugs/forecolor-invalid-value-stored/src/Sources/MyMDIForm.tbform
+++ b/bugs/forecolor-invalid-value-stored/src/Sources/MyMDIForm.tbform
@@ -6,7 +6,7 @@
 		"BackColor": -2147483636,
 		"Caption": "Window",
 		"Enabled": true,
-		"FormDesignerId": "{EAEAEAEA-EAEA-EAEA-EAEA-EAEAEAEAEA01}",
+		"FormDesignerId": "{EAEAEAEA-EAEA-EAEA-EAEA-EAEAEAEAEA02}",
 		"Form_AlwaysShowKeyboardCues": false,
 		"Form_Opacity": 100,
 		"Form_TopMost": false,
diff --git a/bugs/forecolor-invalid-value-stored/src/Sources/MyMDIForm.twin b/bugs/forecolor-invalid-value-stored/src/Sources/MyMDIForm.twin
index b241aaeff..ee52cbbad 100644
--- a/bugs/forecolor-invalid-value-stored/src/Sources/MyMDIForm.twin
+++ b/bugs/forecolor-invalid-value-stored/src/Sources/MyMDIForm.twin
@@ -1,5 +1,5 @@
 [Description("")]
-[FormDesignerId("EAEAEAEA-EAEA-EAEA-EAEA-EAEAEAEAEA01")]
+[FormDesignerId("EAEAEAEA-EAEA-EAEA-EAEA-EAEAEAEAEA02")]
 [PredeclaredId]
 Class MyMDIForm
 
diff --git a/bugs/forecolor-invalid-value-stored/src/Sources/Startup.twin b/bugs/forecolor-invalid-value-stored/src/Sources/Startup.twin
index 2484dfc07..4ae73f0f1 100644
--- a/bugs/forecolor-invalid-value-stored/src/Sources/Startup.twin
+++ b/bugs/forecolor-invalid-value-stored/src/Sources/Startup.twin
@@ -54,6 +54,13 @@ Module Startup
         MyMDIForm.BackColor = vbGreen
         MyMDIForm.BackColor = &H8000001F
         Debug.Print "MDIForm.BackColor = &H8000001F: Err " & Err.Number & ", reads " & Hex$(MyMDIForm.BackColor): Err.Clear
+        MyMDIForm.Show
+        MyMDIForm.BackColor = vbGreen
+        MyMDIForm.BackColor = -1
+        Debug.Print "MDIForm (shown).BackColor = -1: Err " & Err.Number & ", reads " & Hex$(MyMDIForm.BackColor): Err.Clear
+        MyMDIForm.BackColor = vbGreen
+        MyMDIForm.BackColor = &H8000001F
+        Debug.Print "MDIForm (shown).BackColor = &H8000001F: Err " & Err.Number & ", reads " & Hex$(MyMDIForm.BackColor): Err.Clear
         Unload MyMDIForm
     End Sub
 
diff --git a/bugs/forecolor-invalid-value-stored/vb6/Module1.bas b/bugs/forecolor-invalid-value-stored/vb6/Module1.bas
index 55b39d1d9..8f1e9a3f9 100644
--- a/bugs/forecolor-invalid-value-stored/vb6/Module1.bas
+++ b/bugs/forecolor-invalid-value-stored/vb6/Module1.bas
@@ -57,6 +57,13 @@ Private Sub Cases()
     MDIForm1.BackColor = vbGreen
     MDIForm1.BackColor = &H8000001F
     Print #9, "MDIForm.BackColor = &H8000001F: Err " & Err.Number & ", reads " & Hex$(MDIForm1.BackColor): Err.Clear
+    MDIForm1.Show
+    MDIForm1.BackColor = vbGreen
+    MDIForm1.BackColor = -1
+    Print #9, "MDIForm (shown).BackColor = -1: Err " & Err.Number & ", reads " & Hex$(MDIForm1.BackColor): Err.Clear
+    MDIForm1.BackColor = vbGreen
+    MDIForm1.BackColor = &H8000001F
+    Print #9, "MDIForm (shown).BackColor = &H8000001F: Err " & Err.Number & ", reads " & Hex$(MDIForm1.BackColor): Err.Clear
     Unload MDIForm1
 End Sub
 
diff --git a/builder/symbol-baseline.json b/builder/symbol-baseline.json
index 6da00f5ba..7683bde5f 100644
--- a/builder/symbol-baseline.json
+++ b/builder/symbol-baseline.json
@@ -2089,8 +2089,11 @@
     "/tB/Packages/VB/MDIForm/#opacity",
     "/tB/Packages/VB/MDIForm/#picture",
     "/tB/Packages/VB/MDIForm/#picturedpiscaling",
+    "/tB/Packages/VB/MDIForm/#point",
     "/tB/Packages/VB/MDIForm/#popupmenu",
+    "/tB/Packages/VB/MDIForm/#printform",
     "/tB/Packages/VB/MDIForm/#queryunload",
+    "/tB/Packages/VB/MDIForm/#refresh",
     "/tB/Packages/VB/MDIForm/#resize",
     "/tB/Packages/VB/MDIForm/#righttoleft",
     "/tB/Packages/VB/MDIForm/#scaleheight",
diff --git a/docs/Reference/Default/VB/MDIForm/index.md b/docs/Reference/Default/VB/MDIForm/index.md
index e9b03ec14..23ed79fbf 100644
--- a/docs/Reference/Default/VB/MDIForm/index.md
+++ b/docs/Reference/Default/VB/MDIForm/index.md
@@ -93,7 +93,7 @@ An MDIForm always uses the sizable border style --- there is no [**BorderStyle**
 
 [**Opacity**](#opacity) and [**TransparencyKey**](#transparencykey) enable Windows' layered-window features for translucent forms and cut-out shapes.
 
-[**BackColor**](#backcolor) paints the MDI client area's background --- defaults to the system **vbApplicationWorkspace** colour rather than 3-D face. [**Picture**](#picture), when set, is drawn over **BackColor** as the client-area backdrop, scaled to fill the area for metafiles and centred at its natural size for bitmaps. [**PictureDpiScaling**](#picturedpiscaling) scales bitmaps by the current DPI factor before drawing. There is no on-screen drawing API on an MDIForm --- the [**Cls**](../Form/#cls), [**Circle**](../Form/#circle), [**Line**](../Form/#line), [**PSet**](../Form/#pset), [**PaintPicture**](../Form/#paintpicture), and **Print** members of the **Form** interface raise run-time error 438 (*Object doesn't support this property or method*) when called on an MDIForm.
+[**BackColor**](#backcolor) paints the MDI client area's background --- defaults to the system **vbApplicationWorkspace** colour rather than 3-D face. [**Picture**](#picture), when set, is drawn over **BackColor** as the client-area backdrop, scaled to fill the area for metafiles and centred at its natural size for bitmaps. [**PictureDpiScaling**](#picturedpiscaling) scales bitmaps by the current DPI factor before drawing. There is no on-screen drawing API on an MDIForm: it has none of the **Form**'s [**Cls**](../Form/#cls), [**Circle**](../Form/#circle), [**Line**](../Form/#line), [**PSet**](../Form/#pset), [**PaintPicture**](../Form/#paintpicture) and **Print** methods (see [Differences from Form](#differences-from-form)).
 
 A vertical and a horizontal scroll bar appear automatically when an MDI child is moved or sized so that its rectangle extends beyond the visible client area; this is fixed at design time through the **ScrollBars** property of the MDI parent and is not exposed at run time.
 
@@ -111,16 +111,18 @@ End Sub
 
 ## Differences from Form
 
-Because the MDIForm is a frame, not a drawing surface, the following members of the **Form** interface are *not* supported on it --- accessing them raises run-time error 380 (properties) or 438 (methods):
+Because the MDIForm is a frame, not a drawing surface, it does not have the following members of the **Form** interface. Used on the MDIForm's own class, as in `MDIForm1.ForeColor`, each is a compile error. Reached through a variable declared `As Form`, a property raises run-time error 380 (*Invalid property value*) and a method raises 438 (*Object doesn't support this property or method*). Reached through a variable declared `As Object`, each raises an error; in VB6 that error is 438.
 
 | Category                     | Members                                                                              |
 |------------------------------|--------------------------------------------------------------------------------------|
 | Drawing                      | **AutoRedraw**, **ClipControls**, **HasDC**, **hDC**, **Image**, **CurrentX**, **CurrentY**, **DrawMode**, **DrawStyle**, **DrawWidth**, **FillColor**, **FillStyle**, **ForeColor**, **FontTransparent**, **Cls**, **Circle**, **Line**, **PSet**, **PaintPicture** |
-| Font                         | **Font**, **FontName**, **FontSize**, **FontBold**, **FontItalic**, **FontStrikethru**, **FontUnderline**, **TextWidth** |
+| Font                         | **Font**, **FontName**, **FontSize**, **FontBold**, **FontItalic**, **FontStrikethru**, **FontUnderline**, **TextWidth**, **TextHeight** (returns `0` through a variable declared `As Form`) |
 | Geometry                     | **ScaleLeft**, **ScaleTop**, **ScaleMode**, **Scale**, **ScaleX**, **ScaleY** ([**ScaleWidth**](#scalewidth) and [**ScaleHeight**](#scaleheight) are supported but read-only) |
 | Window chrome                | **BorderStyle**, **ControlBox**, **MaxButton**, **MinButton**, **ShowInTaskbar**, **WhatsThisButton** |
-| Other                        | **KeyPreview** (and the [**Form**](../Form/)'s **KeyDown** / **KeyUp** / **KeyPress** events do not exist on **MDIForm**), **MDIChild**, **NegotiateMenus**, **Palette**, **PaletteMode**, **PrintForm**, **Point**, **Refresh** (raises 438 on an MDIForm even though it works on a regular Form) |
-| Behaviour quirk              | **TextHeight** returns `0` instead of raising. (VB6 bug retained for compatibility.) |
+| Other                        | **KeyPreview** (and the [**Form**](../Form/)'s **KeyDown** / **KeyUp** / **KeyPress** events do not exist on **MDIForm**), **MDIChild** (reads **False** through a variable declared `As Form`), **NegotiateMenus**, **Palette**, **PaletteMode** |
+
+> [!NOTE]
+> In twinBASIC, unlike VB6, an MDIForm also has [**Refresh**](#refresh), [**PrintForm**](#printform) and [**Point**](#point). **Print** on the MDIForm's own class compiles, and raises run-time error &H80004002 (*No such interface supported*). BETA 997 raises &H80020006 (*Unknown name*) in place of 438 for a member reached through `As Object`, and **CallByName** raises &H80004005.
 
 ## Properties
 
@@ -158,7 +160,7 @@ When **True** (default), loading an MDI child class also shows it; when **False*
 The colour painted in the MDI client area, as an **OLE_COLOR**. Defaults to the system **vbApplicationWorkspace** colour. Used as the canvas behind [**Picture**](#picture) and behind every MDI child's title bar and outer border.
 
 > [!WARNING]
-> BETA 997 has a defect: assigning a value that is not a colour, such as `-1`, raises no error and stores the value, so a later read returns it. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
+> BETA 997 has a defect: assigning a value that is not a colour, such as `-1` or `&H8000001F`, stores the value, so a later read returns it. While the form is loaded and not yet shown the assignment raises no error; once it is shown it raises error 5, and a handled error leaves the invalid colour in force. VB6 raises error 380, *Invalid property value*, and keeps the old colour. Check a colour that comes from user input before assigning it.
 
 ### Caption
 {: .no_toc }
@@ -414,6 +416,14 @@ Initiates an OLE drag operation from the form, raising the [**OLEStartDrag**](#o
 
 Syntax: *object*.**OLEDrag**
 
+### Point
+{: .no_toc }
+
+> [!NOTE]
+> Not implemented: **Point** returns 0, and the compiler gives warning TB0009 at each call. VB6's MDIForm has no **Point** method.
+
+Syntax: *object*.**Point**( *X*, *Y* )
+
 ### PopUpMenu
 {: .no_toc }
 
@@ -433,6 +443,21 @@ Syntax: *object*.**PopUpMenu** *Menu* [, *Flags* [, *X* [, *Y* [, *DefaultMenu*
 *DefaultMenu*
 : *optional* The **Menu** sub-item to render in bold as the default action.
 
+### PrintForm
+{: .no_toc }
+
+> [!NOTE]
+> Not implemented: the compiler gives warning TB0009 at each call, and the call raises no error. VB6's MDIForm has no **PrintForm** method.
+
+Syntax: *object*.**PrintForm**
+
+### Refresh
+{: .no_toc }
+
+Forces an immediate repaint of the form. VB6's MDIForm has no **Refresh** method.
+
+Syntax: *object*.**Refresh**
+
 ### SetFocus
 {: .no_toc }
 

From 88d4edd1841b4eae9f77c791af5021122847ffca Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Tue, 6 Oct 2026 00:15:25 +0200
Subject: [PATCH 29/42] tbrun refuses, exit 2 before an IDE starts, a probe
 whose [RunAfterBuild] module holds a Sub or Function named like the module
 (twinBASIC then runs nothing); --allow-name-clash runs it anyway, and
 bug_repro's run mode always passes it; wrapProbe reports the clash, with
 probes

---
 WIP.md                         |  2 +-
 docs/Documentation/Tools.md    |  9 +++++++-
 scripts/bug_repro.mjs          |  5 ++++-
 scripts/check_twin_parsers.mjs | 41 ++++++++++++++++++++++++++++++++++
 scripts/lib/tb-probe.mjs       | 20 +++++++++++++----
 scripts/tbrun.mjs              | 25 +++++++++++++++++++--
 6 files changed, 93 insertions(+), 9 deletions(-)

diff --git a/WIP.md b/WIP.md
index 104c80ba9..2fd88a277 100644
--- a/WIP.md
+++ b/WIP.md
@@ -121,7 +121,7 @@ node scripts/tbrun.mjs <exported-source-dir>         # what does it print
 - **It runs the IDE on a private Windows desktop**, so it cannot seize focus. Set `TBBUILD_SHOW=1` while working interactively and leave it unset for unattended runs: a wedged IDE nobody can see is expensive to diagnose.
 - **One project per IDE**, 6--8 seconds each and flat in project size. Reusing a live IDE for a second project wedges it, so the cold start is the unit of work, not overhead to optimise away. Run concurrently to go faster: distinct `--port` values give distinct DevTools ports, user-data folders, temp folders (`%TEMP%\tbbuild-tmp-<port>`; IDEs building in one temp folder fail now and then to write the type library) and desktops.
 - **Keep a probe that might crash the compiler in a project of its own.** twinBASIC runs the compiler in the same process as user code, so one bad probe can take the run down and cost the other probes their answer.
-- **`tbrun` takes an exported tree, not a `.twinproj`**, because it has to pin `project.buildPath` in its own staged copy. A project still on the default template opens a native Save dialog that is invisible on the private desktop: the build never happens, while every health check says the IDE is fine. The probe is a module with a `[RunAfterBuild]` Sub, and must start with `Debug.Cls`. Its exit codes: 0 the probe ran and its output was captured, 1 the project has compile errors, 2 the harness failed or the build did after a clean compile, 3 no output, 4 the compiler crashed, as `tbbuild` reports it, 5 the probe ended before it returned (`End`, or an error raised with no handler in LLVM-compiled code, which ends the run silently), 6 with `--exe`, the exe exited with a code other than 0 or was still running at `--timeout`.
+- **`tbrun` takes an exported tree, not a `.twinproj`**, because it has to pin `project.buildPath` in its own staged copy. A project still on the default template opens a native Save dialog that is invisible on the private desktop: the build never happens, while every health check says the IDE is fine. The probe is a module with a `[RunAfterBuild]` Sub, and must start with `Debug.Cls`. Its exit codes: 0 the probe ran and its output was captured, 1 the project has compile errors, 2 the harness failed or the build did after a clean compile, or the probe's module holds a procedure named like the module, which stops the `[RunAfterBuild]` Sub from running (BETA 997; `--allow-name-clash` runs it anyway), 3 no output, 4 the compiler crashed, as `tbbuild` reports it, 5 the probe ended before it returned (`End`, or an error raised with no handler in LLVM-compiled code, which ends the run silently), 6 with `--exe`, the exe exited with a code other than 0 or was still running at `--timeout`.
 - **Measuring LLVM: `tbrun --llvm`** (or `--compiler-options "<s>"`) compiles the whole probe with LLVM, by setting `compiler.debugOptions` --- what a `[RunAfterBuild]` run is compiled with; `compiler.buildOptions` alone does not reach it (BETA 995) --- and `compiler.buildOptions`, for the exe. It refuses a Community or Personal licence. `--exe` also runs the built exe on a private desktop; the exe runs `Sub Main` and prints with `TbRun.Out`, a module `tbrun` adds, because `Debug.Print` writes nothing in an exe.
 - **A census is evidence, not applicability.** The corpus not using an attribute somewhere does not mean the compiler refuses it there, and the reverse also holds. Only a probe settles that.
 - **The sweep is the probe for a whole attribute.** Before writing or changing an attribute's `Applicable to:` line, run `sweep_attributes.mjs --names <Name>` (a minute or a few; the once-per-project ones, `RunAfterBuild` and `RunBeforeStartupObject`, take several); it tries every declaration site, not only the ones already claimed. **Always pass `--out` and `--dump-results`**: a run piped through `tail` keeps one line of a report that takes ten minutes. A clean build there means the compiler accepts the attribute, not that it does anything, and an Enum member cannot be tested at all (see [WIP.Harness.md](WIP.Harness.md#sweeping-every-attribute-at-every-site)).
diff --git a/docs/Documentation/Tools.md b/docs/Documentation/Tools.md
index 03d4612d1..93270aaa8 100644
--- a/docs/Documentation/Tools.md
+++ b/docs/Documentation/Tools.md
@@ -897,7 +897,7 @@ Exit codes: **0** the project compiled without errors; **1** the project has err
     node scripts/tbrun.mjs <source-dir> [--port N] [--arch win32|win64] [--timeout S]
                            [--quiet MS] [--json] [--raw] [--keep] [--no-reap]
                            [--reap-images a,b] [--show|--hide]
-                           [--llvm | --compiler-options S] [--exe]
+                           [--llvm | --compiler-options S] [--exe] [--allow-name-clash]
 
 Builds a probe project and captures what it writes to the IDE's
 [Debug Console](../../tB/IDE/Project/DebugConsole). Where [`tbbuild.mjs`](#tbbuild) answers
@@ -953,6 +953,12 @@ is one of several marked --- and the check is then off. A probe that stays silen
 than `--quiet` while it works also ends the wait without that line, so raise `--quiet` for a
 slow one.
 
+**A probe whose module holds a procedure named like the module is refused, exit 2**, before
+an IDE starts. In twinBASIC (BETA 997) the `[RunAfterBuild]` Sub of such a module does not run,
+whatever the letter case or modifiers of the procedure, and nothing says so, so the run would end
+as a probe that stopped early. Rename the module or the procedure. `--allow-name-clash` runs the
+probe anyway, which is what a reproducer of that defect needs.
+
 **The capture is complete however much a probe prints**, so there is no reason to keep one
 short. `tbrun` reads the console's backing array rather than the pane, which is a virtualised
 list view holding only the rows that fit --- reading that instead returns the last ten or so
@@ -999,6 +1005,7 @@ adds to the staged copy. `TbRun.Out` writes to the Debug Console in the IDE, and
 | `--llvm` | Compile the whole probe, and the exe, with LLVM. The same as `--compiler-options +llvm`. |
 | `--compiler-options <s>` | The project's compiler options, for the run and the exe. |
 | `--exe` | Also run the built exe, and print what it writes with `TbRun.Out` and its exit code. |
+| `--allow-name-clash` | Run a probe whose module holds a procedure named like the module, which is refused otherwise. twinBASIC does not run its `[RunAfterBuild]` Sub, so the run exits 5. |
 | `--raw` | Keep the console's timestamp column, which is otherwise stripped. |
 | `--json` | One object with the path of the built file, the target, the captured lines, whether the probe returned, the licence an LLVM run checked, the exe's run, the IDE pid and anything reaped. |
 | `--keep` | Leave the IDE running, and print its pid as `ide-pid: <n>` (with `--json`, `idePid`), followed by the `taskkill` command that ends it and every process it started, as cmd and PowerShell spell it and as Git Bash does (`//PID`). Implies `--no-reap`, and leaves the IDE's registry entries for the probe as they are. |
diff --git a/scripts/bug_repro.mjs b/scripts/bug_repro.mjs
index 7c9444669..c3e950f65 100644
--- a/scripts/bug_repro.mjs
+++ b/scripts/bug_repro.mjs
@@ -943,7 +943,10 @@ async function runProbe(slug, o) {
     cpSync(p.src, stage, { recursive: true });
     mkdirSync(path.join(stage, "Sources"), { recursive: true });
     if (!o.exe) writeFileSync(path.join(stage, "Sources", "TbRunProbe.twin"), PROBE);
-    const flags = [...ideFlags(o), ...(o.llvm ? ["--llvm"] : []), ...(o.exe ? ["--exe"] : [])];
+    // Always --allow-name-clash: tbrun refuses a probe whose module holds a procedure named like
+    // the module, because twinBASIC then does not run the [RunAfterBuild] Sub, and a reproducer
+    // exists to show a defect such as that one, so it must still run.
+    const flags = [...ideFlags(o), "--allow-name-clash", ...(o.llvm ? ["--llvm"] : []), ...(o.exe ? ["--exe"] : [])];
     const env = imagesDir ? { [IMAGES_ENV]: imagesDir } : {};
     const r = await runNode([TBRUN, stage, ...flags], limitFor(o.timeout, 120), env);
     return { ...r, json: null, message: r.stderr.trim(), output: r.stdout, imagesDir };
diff --git a/scripts/check_twin_parsers.mjs b/scripts/check_twin_parsers.mjs
index 86221531b..bbd89388a 100644
--- a/scripts/check_twin_parsers.mjs
+++ b/scripts/check_twin_parsers.mjs
@@ -229,6 +229,47 @@ check(
   );
 }
 
+// A Sub or Function named like the hook's module, in that module: `clash` is its
+// name as written, and tbrun refuses the probe (BETA 997: the hook does not run).
+const hook = "    [RunAfterBuild]\n    Sub Go()\n    End Sub";
+const named = (text, files = []) => wrapProbe([...files, { name: "Probe.twin", text }]);
+for (const [what, text, want, files] of [
+  ["a Sub of the module's name", probe(`${hook}\n    Sub Probe()\n    End Sub`), "Probe"],
+  [
+    "a Private Function of the module's name",
+    probe(`${hook}\n    Private Function Probe() As Long\n    End Function`),
+    "Probe",
+  ],
+  ["the name in another letter case", probe(`${hook}\n    Public Sub PROBE()\n    End Sub`), "PROBE"],
+  ["a procedure before the hook", probe(`    Friend Sub probe()\n    End Sub\n${hook}`), "probe"],
+  ["a Sub that only starts with the module's name", probe(`${hook}\n    Sub ProbeHelper()\n    End Sub`), undefined],
+  ["a Sub that ends with the module's name", probe(`${hook}\n    Sub MyProbe()\n    End Sub`), undefined],
+  ["a comment line holding Sub Probe", probe(`${hook}\n    ' Sub Probe()\n    Sub Other()\n    End Sub`), undefined],
+  [
+    "the same name in another module of the file",
+    `${probe(hook)}Module Other\n    Sub Probe()\n    End Sub\nEnd Module\n`,
+    undefined,
+  ],
+  [
+    "the same name in another module before it",
+    `Module Other\n    Sub Probe()\n    End Sub\nEnd Module\n${probe(hook)}`,
+    undefined,
+  ],
+  [
+    "the same name in another file",
+    probe(hook),
+    undefined,
+    [{ name: "Other.twin", text: "Module Other\n    Sub Probe()\n    End Sub\nEnd Module\n" }],
+  ],
+]) {
+  const r = named(text, files);
+  check(
+    `wrapProbe: clash, ${what}`,
+    r.wrapped?.sub === "Go" && r.wrapped.clash === want,
+    show({ wrapped: r.wrapped, why: r.why }),
+  );
+}
+
 // ---------------------------------------------------------------- sentinelIndex
 // What tbrun reads to tell a probe that returned from one that ended first.
 const WAITING = "[DEBUGGER] Waiting for remaining forms to close...";
diff --git a/scripts/lib/tb-probe.mjs b/scripts/lib/tb-probe.mjs
index 31275f378..539613521 100644
--- a/scripts/lib/tb-probe.mjs
+++ b/scripts/lib/tb-probe.mjs
@@ -10,7 +10,10 @@
 //     BETA 995 -- leaves no SENTINEL, which is how tbrun tells it from one that
 //     finished. Appended to the same module, so a Private probe Sub can be
 //     called. The attribute is blanked to spaces rather than deleted, so every
-//     line and column a diagnostic names is still the caller's.
+//     line and column a diagnostic names is still the caller's. The wrapper
+//     does not help a module that also holds a procedure named like the
+//     module: twinBASIC does not run the hook then, and wrapProbe reports the
+//     procedure as `clash` so that tbrun can refuse the probe.
 //   * The TbRun module, whose Out writes a line where the run can read it: the
 //     DEBUG CONSOLE in the IDE, and standard output in a built exe, where
 //     Debug.Print writes nothing. The wrapper tells it which: it sets IDE_FLAG
@@ -44,6 +47,7 @@ const SUB_RE = new RegExp(
   `^[ \\t]*(?:(?:${MODIFIERS})[ \\t]+)*Sub[ \\t]+(\\w+)[ \\t]*(?:\\([ \\t]*\\))?[ \\t]*(?:'.*)?$`,
   "i",
 );
+const PROCEDURE_RE = new RegExp(`^[ \\t]*(?:(?:${MODIFIERS})[ \\t]+)*(?:Sub|Function)[ \\t]+(\\w+)`, "gim");
 const SKIPPED_RE = /^[ \t]*(?:'.*|\[[^\]]*\][ \t]*)?$/;
 const CONTAINER_RE = new RegExp(
   `^[ \\t]*(?:(?:${MODIFIERS})[ \\t]+)*(Module|Class|CoClass|Interface)[ \\t]+(\\w+)`,
@@ -56,8 +60,10 @@ const TBRUN_MODULE_RE = /^[ \t]*(?:(?:Public|Private)[ \t]+)?Module[ \t]+TbRun\b
  * Wrap a probe's [RunAfterBuild] Sub, and add the TbRun module.
  *
  * @param {{name: string, text: string}[]} files  the tree's Sources/*.twin
- * @returns {{files: {name: string, text: string}[], wrapped: {file: string, module: string, sub: string} | null, why?: string}}
- *   the files to write (changed or new), what was wrapped, and why nothing was
+ * @returns {{files: {name: string, text: string}[], wrapped: {file: string, module: string, sub: string, clash?: string} | null, why?: string}}
+ *   the files to write (changed or new), what was wrapped, and why nothing was.
+ *   `clash` names a Sub or Function of the hook's module that has the module's
+ *   own name, which stops the hook from running in twinBASIC (BETA 997)
  */
 export function wrapProbe(files) {
   const out = [];
@@ -103,6 +109,12 @@ export function wrapProbe(files) {
   if (!closing) return none(`no End Module after ${sub}`);
   const insertAt = afterSub + closing.index;
 
+  // A Sub or Function named like its module (any case, any modifiers) in the
+  // module that holds the hook: the hook does not run (BETA 997).
+  const clash = [...f.text.slice(container.index, insertAt).matchAll(PROCEDURE_RE)].find(
+    (m) => m[1].toLowerCase() === container[2].toLowerCase(),
+  )?.[1];
+
   const eol = f.text.includes("\r\n") ? "\r\n" : "\n";
   const wrapper = [
     `${indent}[RunAfterBuild]`,
@@ -117,7 +129,7 @@ export function wrapProbe(files) {
   const text =
     f.text.slice(0, at) + " ".repeat(end - at) + f.text.slice(end, insertAt) + wrapper + f.text.slice(insertAt);
   out.push({ name: f.name, text });
-  return { files: out, wrapped: { file: f.name, module: container[2], sub } };
+  return { files: out, wrapped: { file: f.name, module: container[2], sub, clash } };
 }
 
 // Debug.Print writes nothing in a built exe (docs/Features/Project-Configuration/
diff --git a/scripts/tbrun.mjs b/scripts/tbrun.mjs
index 2dbb75158..de0c7aa0b 100644
--- a/scripts/tbrun.mjs
+++ b/scripts/tbrun.mjs
@@ -25,11 +25,16 @@
 //                         is refused on a Community or Personal licence
 //       --exe             run the built exe as well, on a private desktop, and
 //                         capture what it writes with TbRun.Out and its exit code
+//       --allow-name-clash  run a probe whose module holds a procedure named
+//                         like the module; twinBASIC does not run its
+//                         [RunAfterBuild] Sub, so tbrun refuses it otherwise
 //
 // Exit: 0 captured output, 1 the project has compile errors, 2 the harness
 // could not run (a refused command line included), a compile never settled, or
 // it crashed -- a build that fails after a clean compile included, and a
 // [RunAfterBuild] Sub that fails code generation, since the probe never runs,
+// and a probe whose module holds a procedure named like the module, which
+// does not run either (unless --allow-name-clash),
 // and a procedure the probe calls that fails it, since the probe stops at the
 // call -- 3 no output: the build produced none in the console before the
 // timeout, or the probe ran and printed none after its last Debug.Cls -- 4 the
@@ -156,7 +161,7 @@ import { captureRun, checkCapture, strip } from "./lib/tb-run.mjs";
 
 exitOnCrash();
 
-const USAGE = `usage: node scripts/tbrun.mjs <source-dir> [--ide <twinBASIC.exe>] [--port N] [--arch win32|win64] [--timeout S] [--quiet MS] [--json] [--raw] [--keep] [--no-reap] [--reap-images a,b] [--show|--hide] [--llvm | --compiler-options S] [--exe] [-h, --help]
+const USAGE = `usage: node scripts/tbrun.mjs <source-dir> [--ide <twinBASIC.exe>] [--port N] [--arch win32|win64] [--timeout S] [--quiet MS] [--json] [--raw] [--keep] [--no-reap] [--reap-images a,b] [--show|--hide] [--llvm | --compiler-options S] [--exe] [--allow-name-clash] [-h, --help]
 
 Builds an exported twinBASIC source tree in the IDE, runs it, and prints what it
 writes to the DEBUG CONSOLE.
@@ -182,6 +187,9 @@ writes to the DEBUG CONSOLE.
                       +llvm is refused on a Community or Personal licence
   --exe               also run the built exe on a private desktop, and print
                       what it writes with TbRun.Out and its exit code
+  --allow-name-clash  run a probe whose module holds a procedure named like the
+                      module, which twinBASIC does not run (it is refused
+                      without this option)
   -h, --help          print this text and exit
 
 Exit codes:
@@ -190,7 +198,8 @@ Exit codes:
   2  a refused command line (a source folder that is missing or has no Settings file
      included), no IDE, an IDE that did not start, a compile that never
      settled, a build that failed after a clean compile, a probe that never ran or
-     stopped at a procedure that failed code generation, an --llvm run on a
+     stopped at a procedure that failed code generation, a probe whose module holds
+     a procedure named like the module (unless --allow-name-clash), an --llvm run on a
      Community or Personal licence, an --exe run with no exe built, or a crash
   3  no output: the console held none before the timeout, or the probe printed none
      after its last Debug.Cls
@@ -213,6 +222,7 @@ const { values, positionals } = withUsageError(
         "compiler-options": { type: "string" },
         llvm: { type: "boolean", default: false },
         exe: { type: "boolean", default: false },
+        "allow-name-clash": { type: "boolean", default: false },
         json: { type: "boolean", default: false },
         raw: { type: "boolean", default: false },
         keep: { type: "boolean", default: false },
@@ -371,6 +381,17 @@ if (hasHook && !wrap.wrapped) {
     `warning: ${wrap.why} -- so a probe that ends before it returns cannot be told from one that finished.`,
   );
 }
+// Refused before an IDE starts, which is the first thing after this that costs anything.
+if (wrap.wrapped?.clash && !values.allowNameClash) {
+  die(
+    2,
+    `tbrun: module ${wrap.wrapped.module} holds the [RunAfterBuild] Sub ${wrap.wrapped.sub} and also a procedure named ` +
+      `${wrap.wrapped.clash}, like the module. In twinBASIC (BETA 997) a [RunAfterBuild] Sub does not run, and ` +
+      `nothing says so, when its module holds a procedure named like the module (BUGS-TO-REPORT.md, "A [RunAfterBuild] ` +
+      `Sub does not run, and nothing says so, when its module holds a procedure named like the module"). ` +
+      `Rename one of them, or pass --allow-name-clash to run it anyway.`,
+  );
+}
 
 // What the build wrote: the IDE expands the template, so the name is looked for
 // rather than assumed -- ${FileExtension} follows the build type -- and the

From a55f5c80dd50ff277cb2a069133ce74af255ba19 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Tue, 6 Oct 2026 00:23:35 +0200
Subject: [PATCH 30/42] tbrun's --compiler-options reaches the project: it read
 values["compiler-options"], which parseCli never sets (keys are camelCased),
 so the option was ignored

---
 scripts/tbrun.mjs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/tbrun.mjs b/scripts/tbrun.mjs
index de0c7aa0b..275f92e55 100644
--- a/scripts/tbrun.mjs
+++ b/scripts/tbrun.mjs
@@ -338,7 +338,7 @@ if (!hasHook) {
 // [RunAfterBuild] run is compiled with, and compiler.buildOptions what the exe
 // is -- measured on BETA 995, where +llvm in the build options alone left the
 // run's Debug.Assert evaluated and its loop at the speed of the default.
-const compilerOptions = values.llvm ? "+llvm" : values["compiler-options"];
+const compilerOptions = values.llvm ? "+llvm" : values.compilerOptions;
 let wasTemplate = false,
   projectName = "",
   usesLlvm = false,

From dc9b566483845d34152ebc596cf655731b959e43 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Tue, 6 Oct 2026 00:35:29 +0200
Subject: [PATCH 31/42] search_quality reads its --compare file before the
 evaluation and refuses a bad one, exit 2

---
 eval/search_quality.mjs   | 22 +++++++++++++++-------
 scripts/lib/cli-cases.mjs |  1 +
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/eval/search_quality.mjs b/eval/search_quality.mjs
index 104ace13b..a7bb40e46 100644
--- a/eval/search_quality.mjs
+++ b/eval/search_quality.mjs
@@ -752,11 +752,23 @@ function main() {
         "[--compare file] [--worst N] [--sample N] [--failures N] [-h, --help]\n\nSee the header comment in this file.\n\n" +
         "Exit codes:\n" +
         "  0  the measurement ran, whatever it found\n" +
-        "  2  a refused command line, a site with no search index (run build.bat first),\n" +
-        "     or a crash",
+        "  2  a refused command line, an unreadable --compare file, a site with no\n" +
+        "     search index (run build.bat first), or a crash",
     );
   }
 
+  // Read before the evaluation, which takes the time, so a bad file is refused at once.
+  let saved = null;
+  if (opts.compare) {
+    try {
+      saved = JSON.parse(fs.readFileSync(opts.compare, "utf8"));
+    } catch (e) {
+      console.error(`cannot read --compare ${path.relative(REPO_ROOT, opts.compare)}: ${e.message}`);
+      process.exit(2);
+    }
+    saved.file = opts.compare;
+  }
+
   const ctx = load(opts.site);
   const { dataPath } = (function () {
     // load() already validated these paths exist; recompute the data path
@@ -811,11 +823,7 @@ function main() {
   printTable(result);
   if (opts.failures) printFailures(result.perQuery, opts.failures);
 
-  if (opts.compare) {
-    const saved = JSON.parse(fs.readFileSync(opts.compare, "utf8"));
-    saved.file = opts.compare;
-    printCompare(result, saved, opts.worstN);
-  }
+  if (saved) printCompare(result, saved, opts.worstN);
 
   if (opts.save) {
     const compact = {
diff --git a/scripts/lib/cli-cases.mjs b/scripts/lib/cli-cases.mjs
index a960379e8..414278d92 100644
--- a/scripts/lib/cli-cases.mjs
+++ b/scripts/lib/cli-cases.mjs
@@ -259,6 +259,7 @@ const CASES = [
   { tool: "eval/search_quality.mjs", args: ["--help=1"], exit: 2, stderr: "--help takes no value\n" },
   { tool: "eval/search_quality.mjs", args: ["-x"], exit: 2, stderr: "unknown option: -x\n" },
   { tool: "eval/search_quality.mjs", args: ["--site", "nowhere"], exit: 2, stderr: /^missing .*search-data\.json\nRun build\.bat / },
+  { tool: "eval/search_quality.mjs", args: ["--site", "nowhere", "--compare", "absent.json"], exit: 2, stderr: /^cannot read --compare .*absent\.json: ENOENT/ },
   { tool: "eval/search_quality.mjs", args: ["--site", "nowhere", "--sample", "abc"], exit: 2, stderr: "--sample expects a whole number of at least 1, got: abc\n" },
   { tool: "eval/search_quality.mjs", args: ["--site", "--help"], exit: 2, stderr: "--site needs a value\n" },
   { tool: "eval/search_quality.mjs", args: ["--site"], exit: 2, stderr: "--site needs a value\n" },

From 04a6005580eacf546f1ea9bd6c67a670dc10cf56 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Tue, 6 Oct 2026 00:35:30 +0200
Subject: [PATCH 32/42] check_examples refuses a --port whose lanes (base +
 jobs - 1) would pass 65535

---
 scripts/check_examples.mjs | 14 ++++++++++++--
 scripts/lib/cli-cases.mjs  |  1 +
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/scripts/check_examples.mjs b/scripts/check_examples.mjs
index 9fbecf9f6..d0890f458 100644
--- a/scripts/check_examples.mjs
+++ b/scripts/check_examples.mjs
@@ -220,10 +220,20 @@ const { only, jobs, basePort, batchSize } = withUsageError(
     refuseTogether(values, ["show", "hide"]);
     if (values.apply && !values.propose)
       throw new CliError("conflict", "--apply needs --propose", { option: "--apply" });
+    const jobs = numberOption(values.jobs ?? String(DEFAULT_JOBS), { option: "--jobs", integer: true, min: 1 });
+    const basePort = numberOption(values.port ?? "9480", { option: "--port", integer: true, min: 1, max: 65535 });
+    // Lane i builds on port basePort + i (runAll).
+    if (basePort + jobs - 1 > 65535) {
+      throw new CliError(
+        "conflict",
+        `--port ${basePort} with --jobs ${jobs} needs ports up to ${basePort + jobs - 1}, past 65535`,
+        { option: "--port" },
+      );
+    }
     return {
       only: values.only ? regexOption(values.only, { option: "--only" }) : null,
-      jobs: numberOption(values.jobs ?? String(DEFAULT_JOBS), { option: "--jobs", integer: true, min: 1 }),
-      basePort: numberOption(values.port ?? "9480", { option: "--port", integer: true, min: 1, max: 65535 }),
+      jobs,
+      basePort,
       batchSize: numberOption(values.batch ?? String(DEFAULT_BATCH), { option: "--batch", integer: true, min: 1 }),
     };
   },
diff --git a/scripts/lib/cli-cases.mjs b/scripts/lib/cli-cases.mjs
index 414278d92..15aa15f19 100644
--- a/scripts/lib/cli-cases.mjs
+++ b/scripts/lib/cli-cases.mjs
@@ -737,6 +737,7 @@ bad("scripts/try_help_addin.mjs", ["--port=1.5"], NOT_PORT(1.5) + "\n");
   bad(tool, ["--batch", "0"], say(NOT_COUNT("--batch", 0)));
   bad(tool, ["--port", "0"], say(NOT_PORT(0)));
   bad(tool, ["--port=65536"], say(NOT_PORT(65536)));
+  bad(tool, ["--port", "65534", "--jobs", "3"], say("--port 65534 with --jobs 3 needs ports up to 65536, past 65535"));
   bad(
     tool,
     ["--only", "("],

From 87799b1245473cbe19e2208545d56a71ff974584 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Tue, 6 Oct 2026 00:35:30 +0200
Subject: [PATCH 33/42] build_corpus refuses a --dest inside the tree it
 mirrors, unless the walk skips it

---
 eval/README.md            |  6 ++++--
 eval/build_corpus.mjs     | 11 ++++++++++-
 scripts/lib/cli-cases.mjs |  9 +++++++++
 3 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/eval/README.md b/eval/README.md
index cb0d61393..2110d1bcb 100644
--- a/eval/README.md
+++ b/eval/README.md
@@ -49,12 +49,14 @@ node eval/run_case.mjs --corpus <corpus> --site <snapshot> --protocol repo \
 ```
 
 `build_corpus.mjs` empties `--dest` before it writes, so it refuses a `--dest` that is or
-contains the repository root, the current folder or `--repo`, on stderr.
+contains the repository root, the current folder or `--repo`, on stderr. It also refuses a
+`--dest` inside the tree it mirrors, unless that folder is one the mirror skips (`.claude/`,
+a build output tree under `docs/`).
 `run_case.mjs` likewise refuses a `--timeout` (minutes) that is not a number greater than 0
 and at most 35791, and a
 `--protocol` other than `repo` or `site`.
 
-`build_corpus.mjs` exit codes: **0** the corpus was built; **2** a refused command line (a `--dest` that is or contains the repository, the working folder or `--repo` included), or a crash.
+`build_corpus.mjs` exit codes: **0** the corpus was built; **2** a refused command line (a `--dest` that is or contains the repository, the working folder or `--repo`, or lies inside the tree it mirrors), or a crash.
 
 Each case is **one goal** from [usecases.md](usecases.md), in a file of its own, and
 nothing else. Never tell the evaluator what the case is testing or that a hazard exists.
diff --git a/eval/build_corpus.mjs b/eval/build_corpus.mjs
index c3b3a1267..375a0355d 100644
--- a/eval/build_corpus.mjs
+++ b/eval/build_corpus.mjs
@@ -127,6 +127,15 @@ function refuseDest(dest, repo) {
       );
     }
   }
+  // A `dest` inside the tree being mirrored is walked too, so the mirror reads
+  // back what it is writing, unless the walk passes over that folder.
+  if (isInside(repo, dest) && !isExcluded(path.relative(repo, dest).split(path.sep).join("/"))) {
+    throw new CliError(
+      "bad-dest",
+      `refusing --dest ${dest}: it is inside ${repo}, which the corpus mirrors, so the mirror would copy itself`,
+      { option: "--dest", value: dest },
+    );
+  }
 }
 
 function parseArgs(argv) {
@@ -261,7 +270,7 @@ if (opts.help || !opts.dest) {
       "Exit codes:\n" +
       "  0  the corpus was built\n" +
       "  2  a refused command line (a --dest that is or contains the repository, the\n" +
-      "     working folder or --repo included), or a crash",
+      "     working folder or --repo, or lies inside the tree it mirrors), or a crash",
     opts.help ? {} : { stream: "stderr", exitCode: 2 },
   );
 }
diff --git a/scripts/lib/cli-cases.mjs b/scripts/lib/cli-cases.mjs
index 15aa15f19..0d0c93775 100644
--- a/scripts/lib/cli-cases.mjs
+++ b/scripts/lib/cli-cases.mjs
@@ -858,6 +858,15 @@ bad("eval/nav_hops.mjs", ["Reference", "[a-"], REGEX_REASON("<url-regex>", "[a-"
     refuse(literal(docs), literal(`--repo ${path.join(docs, "Reference")}`)),
   );
   bad(tool, ["--repo", docs, "--dest", docs], refuse(literal(docs), literal(`--repo ${docs}`)));
+  // A --dest inside the mirrored tree is refused too, or the walk reads it back.
+  const inside = path.join(docs, "Reference", "corpus");
+  bad(
+    tool,
+    ["--repo", docs, "--dest", inside],
+    new RegExp(
+      `^refusing --dest ${literal(inside)}: it is inside ${literal(docs)}, which the corpus mirrors, so the mirror would copy itself\\n$`,
+    ),
+  );
 }
 
 // wisdom's command in these is never a real one, so that none can start an

From 3043851dc52c58d33b7831a9426d4103b26985f3 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Tue, 6 Oct 2026 01:48:05 +0200
Subject: [PATCH 34/42] FAQ and Window > Language: the IDE ships 19 language
 packs in its locale folder; the menu's list written out in English

---
 docs/IDE/Menu/Window.md    | 22 ++++++++++++++++++++--
 docs/Miscellaneous/FAQs.md |  4 +++-
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/docs/IDE/Menu/Window.md b/docs/IDE/Menu/Window.md
index f18bf0fd1..75cae8e1e 100644
--- a/docs/IDE/Menu/Window.md
+++ b/docs/IDE/Menu/Window.md
@@ -973,6 +973,24 @@ permalink: /tB/IDE/Project/Menu/Window
 
 ![The Window menu with Language highlighted and its submenu open to the right, listing nineteen languages in one tall column from Catalan and German through to Chinese Simplified and Chinese Traditional. Each is named in English with its own native spelling beside it, and English, British English, carries the tick.](Images/Menu_Window_Language.png)
 
-- ...
+Each language is listed by its English name, followed by its native name. British English is the base language; a string that another language pack does not translate is shown in British English.
+
+- Catalan
+- German
+- Greek
 - English (British English)
-- ...
+- Spanish
+- French
+- Hindi
+- Hungarian
+- Indonesian
+- Italian
+- Japanese
+- Malayalam
+- Polish
+- Portuguese (Brazil)
+- Russian
+- Swedish
+- Turkish
+- Chinese Simplified
+- Chinese Traditional
diff --git a/docs/Miscellaneous/FAQs.md b/docs/Miscellaneous/FAQs.md
index d9d7be796..0facbfa19 100644
--- a/docs/Miscellaneous/FAQs.md
+++ b/docs/Miscellaneous/FAQs.md
@@ -134,7 +134,9 @@ You can also create a post in the #bugs channel of the [twinBASIC Discord server
 <details>
 <summary markdown=span id="localization"><b>Is the twinBASIC IDE available in other languages?</b></summary>
 
-The IDE currently has basic support for localizing all of the front end UI, with translations supplied by members of the community. These can be obtained from [#langpacks on the tB Discord server](https://discord.com/channels/927638153546829845/1329533568376115282), there's currently around 10 including French, German, Italian, Portuguese, Russian, Chinese (Simplified), Chinese (Traditional), Japanese, Swedish, Hungarian, Greek, Catalan, Indonesian (Bahasa), and Malayalam. Others may have been posted since this was written; check the channel.
+Yes. The whole front-end UI can be localized, with translations supplied by members of the community. The IDE ships with language packs for Catalan, Chinese (Simplified), Chinese (Traditional), French, German, Greek, Hindi, Hungarian, Indonesian (Bahasa), Italian, Japanese, Malayalam, Polish, Portuguese (Brazil), Russian, Spanish, Swedish and Turkish, besides the base British English. Choose one under [**Window** > **Language**](tB/IDE/Project/Menu/Window#language).
+
+Each pack is a UTF-8 text file in the `locale` folder of the IDE, named by its IETF language tag (`pl-pl.lang`, `fr-fr.lang`); the folder's `README.txt` says how to write a new one. A string a pack does not translate is taken from the base pack, `en-gb.lang`. Translators share new and updated packs in [#langpacks on the tB Discord server](https://discord.com/channels/927638153546829845/1329533568376115282).
 
 Internal text such as the hover information does not yet support localization, but this is planned for the future.
 

From f25eb6c9dba917ca83c8f79a01054c592de8f022 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Tue, 6 Oct 2026 01:48:05 +0200
Subject: [PATCH 35/42] BETA 984/985 on 997: Checks attributes (True) override
 the project setting; min \ -1 and Mod -1 raise error 6; MustBeQualified
 described from the sweep and probes

---
 docs/IDE/Project Settings.md         |  6 ++---
 docs/Reference/Attributes.md         | 34 ++++++++++++++++++++++++----
 docs/Reference/Core/IntegerDivide.md |  3 +--
 docs/Reference/Core/Mod.md           |  3 +--
 4 files changed, 34 insertions(+), 12 deletions(-)

diff --git a/docs/IDE/Project Settings.md b/docs/IDE/Project Settings.md
index 58b168a32..4dd41b5df 100644
--- a/docs/IDE/Project Settings.md	
+++ b/docs/IDE/Project Settings.md	
@@ -240,15 +240,15 @@ In the `Settings` file it is `compiler.traceOutput`.
 
 ## Disable Overflow Checks
 
-When set to **Yes**, the compiler leaves out every run-time check for integer overflow in arithmetic, which produces more efficient code. It is **No** by default. It is the same as [**IntegerOverflowChecks(False)**](../../Core/Attributes#integeroverflowchecks) on every procedure in the project, and the compiler then ignores any **IntegerOverflowChecks** attribute in the project. It affects the project only, not the packages it references. In the `Settings` file it is `compiler.disableOverflowChecks`.
+When set to **Yes**, the compiler leaves out every run-time check for integer overflow in arithmetic, which produces more efficient code. It is **No** by default. It is the same as [**IntegerOverflowChecks(False)**](../../Core/Attributes#integeroverflowchecks) on every procedure in the project. [**IntegerOverflowChecks(True)**](../../Core/Attributes#integeroverflowchecks) on a procedure, module or class turns the integer overflow checks back on there. Dividing the most negative **Integer**, **Long** or **LongLong** by -1 with [**\\**](../../Core/IntegerDivide) or [**Mod**](../../Core/Mod) raises error 6 whatever the setting. It affects the project only, not the packages it references. In the `Settings` file it is `compiler.disableOverflowChecks`.
 
 ## Disable Array Bounds Checks
 
-When set to **Yes**, the compiler leaves out every run-time check of array bounds when array elements are read and written, which produces more efficient code. It is **No** by default. It is the same as [**ArrayBoundsChecks(False)**](../../Core/Attributes#arrayboundschecks) on every procedure in the project, and the compiler then ignores any **ArrayBoundsChecks** attribute in the project. It affects the project only, not the packages it references. In the `Settings` file it is `compiler.disableArrayBoundsChecks`.
+When set to **Yes**, the compiler leaves out every run-time check of array bounds when array elements are read and written, which produces more efficient code. It is **No** by default. It is the same as [**ArrayBoundsChecks(False)**](../../Core/Attributes#arrayboundschecks) on every procedure in the project. [**ArrayBoundsChecks(True)**](../../Core/Attributes#arrayboundschecks) on a procedure, module or class turns the array bounds checks back on there. It affects the project only, not the packages it references. In the `Settings` file it is `compiler.disableArrayBoundsChecks`.
 
 ## Disable FPU Error Checks
 
-When set to **Yes**, the compiler leaves out every run-time check for floating-point (FPU) errors in arithmetic, which produces more efficient code. It is **No** by default. It is the same as [**FloatingPointErrorChecks(False)**](../../Core/Attributes#floatingpointerrorchecks) on every procedure in the project, and the compiler then ignores any **FloatingPointErrorChecks** attribute in the project. It affects the project only, not the packages it references. In the `Settings` file it is `compiler.disableFPUErrorChecks`.
+When set to **Yes**, the compiler leaves out every run-time check for floating-point (FPU) errors in arithmetic, which produces more efficient code. It is **No** by default. It is the same as [**FloatingPointErrorChecks(False)**](../../Core/Attributes#floatingpointerrorchecks) on every procedure in the project. [**FloatingPointErrorChecks(True)**](../../Core/Attributes#floatingpointerrorchecks) on a procedure, module or class turns the floating-point error checks back on there. It affects the project only, not the packages it references. In the `Settings` file it is `compiler.disableFPUErrorChecks`.
 
 ## Sanitize Booleans
 
diff --git a/docs/Reference/Attributes.md b/docs/Reference/Attributes.md
index 3fb3d2f39..55df09b9f 100644
--- a/docs/Reference/Attributes.md
+++ b/docs/Reference/Attributes.md
@@ -63,7 +63,7 @@ Syntax: **[ArrayBoundsChecks** [ **( True** \| **False )** ] **]**
 
 Applicable to: [**Class**](Class), [**Module**](Module), [procedure](../Gloss#procedure)
 
-Disables or enables array element access bounds checking within the scope of a class, module, or a single procedure/method. Used on performance-critical routines.
+Disables or enables array element access bounds checking within the scope of a class, module, or a single procedure/method. Used on performance-critical routines. **ArrayBoundsChecks(False)** turns the check off. **ArrayBoundsChecks(True)** turns it back on where the project setting [**Disable Array Bounds Checks**](../IDE/Project/Settings#disable-array-bounds-checks) has turned it off for the whole project.
 
 ## BindOnlyIfNoArguments  (optional Bool)
 {: #bindonlyifnoarguments }
@@ -580,7 +580,7 @@ Syntax: **[FloatingPointErrorChecks** [ **( True** \| **False)** ] **]**
 
 Applicable to: [**Class**](Class), [**Module**](Module), [procedure](../Gloss#procedure)
 
-Disables floating point error checks. Used on performance-critical routines. The default value is **True**.
+Disables or enables floating point error checks within the scope of a class, module, or a single procedure/method. Used on performance-critical routines. **FloatingPointErrorChecks(False)** turns the checks off. **FloatingPointErrorChecks(True)** turns them back on where the project setting [**Disable FPU Error Checks**](../IDE/Project/Settings#disable-fpu-error-checks) has turned them off for the whole project.
 
 ## FormDesignerId  (String)
 {: #formdesignerid }
@@ -697,7 +697,9 @@ Syntax: **[IntegerOverflowChecks** [ **( True** \| **False )** ] **]**
 
 Applicable to: [**Class**](Class), [**Module**](Module), [procedure](../Gloss#procedure)
 
-Disables integer overflow checks. Used on performance-critical routines. The default value is **True**.
+Disables or enables integer overflow checks within the scope of a class, module, or a single procedure/method. Used on performance-critical routines. **IntegerOverflowChecks(False)** turns the checks off. **IntegerOverflowChecks(True)** turns them back on where the project setting [**Disable Overflow Checks**](../IDE/Project/Settings#disable-overflow-checks) has turned them off for the whole project.
+
+Dividing the most negative **Integer**, **Long** or **LongLong** by -1 with [**\\**](IntegerDivide) or [**Mod**](Mod) raises error 6 whatever this attribute or the project setting says.
 
 ## InterfaceId  (String)
 {: #interfaceid }
@@ -765,7 +767,29 @@ The **Library** keyword is not available in project source: `Library`, `End Libr
 
 Syntax:  **[MustBeQualified** [ **(True** \| **False )** ] **]**
 
-Applicable to: [procedure](../Gloss#procedure)
+Applicable to: [**Module**](Module), and to [procedures](../Gloss#procedure), [**Declare**](Declare) statements and [**Enum**](Enum)s in a [**Module**](Module)
+
+Requires a name to be written with its qualifier, so that names that would otherwise clash stay apart. **MustBeQualified** and **MustBeQualified(True)** are the same; **MustBeQualified(False)** has no effect.
+
+- On a procedure, code outside its module must call it as *module*.*procedure*. A call without the module name is error **TB5079**, *Unrecognized symbol*. Inside its own module the procedure can still be called by its name alone.
+- On an **Enum**, code outside its module must write each member as *enum*.*member*; inside its own module the member can still be written alone. The type name itself can still be used alone, as in `As` *enum*.
+- On a **Module**, the module name must itself be qualified by the project or package name: *project*.*module*.*member*. The module's members can still be used by their names alone.
+
+The **Assert** package marks all three of its modules this way, which is why its members are called as `Assert.Strict.IsTrue` and never as `Strict.IsTrue`; see [Assert](../Packages/Assert/). The **VBRUN** package marks some of its enumerations.
+
+```tb check_build
+[MustBeQualified]
+Public Enum PenStyle
+    Solid
+    Dashed
+End Enum
+
+Public Sub Draw()
+    Dim Style As PenStyle = PenStyle.Dashed   ' outside this module, a bare Dashed is TB5079
+End Sub
+```
+
+On a class, a member of a class, or an **Enum** in a class, the attribute is error **TB5155**, *This attribute is not supported in this context*.
 
 ## NonBrowsable  (optional Bool)
 {: #nonbrowsable }
@@ -954,7 +978,7 @@ Specifies a function that runs after your exe is built. There's `App.LastBuildPa
 Only one **[RunAfterBuild]** is allowed per project. A second one is a compile error.
 
 > [!WARNING]
-> BETA 995 and 997 have a defect: when a module has the project's name, in any letter case, the **[RunAfterBuild]** procedure does not run, and nothing says so. The build succeeds, and the DEBUG CONSOLE ends at its `[BUILD] Executing '...'` line. An empty module of that name stops it as well, when the procedure is in another module. VB6 refuses a module of the project's name. Do not give a module the project's name.
+> BETA 997 has a defect: when a module has the project's name, in any letter case, the **[RunAfterBuild]** procedure does not run, and nothing says so. The build succeeds, and the DEBUG CONSOLE ends at its `[BUILD] Executing '...'` line. An empty module of that name stops it as well, when the procedure is in another module. VB6 refuses a module of the project's name. Do not give a module the project's name.
 >
 > BETA 997 has a second defect of the same kind: when the module that holds the **[RunAfterBuild]** procedure also holds a procedure with the module's own name, in any letter case, such as a `Sub Probe` in a module `Probe`, the procedure does not run, and nothing says so. The other procedure does not have to be called. VB6 allows a procedure named like its module. Do not give a procedure the name of the module that holds it.
 
diff --git a/docs/Reference/Core/IntegerDivide.md b/docs/Reference/Core/IntegerDivide.md
index 68f42826f..270b8f1d9 100644
--- a/docs/Reference/Core/IntegerDivide.md
+++ b/docs/Reference/Core/IntegerDivide.md
@@ -31,8 +31,7 @@ Any fractional portion of the quotient is discarded, so the quotient is truncate
 
 Dividing by zero raises error 11, *Division by zero*.
 
-> [!WARNING]
-> Dividing the most negative **Integer** (-32,768) or **Long** (-2,147,483,648) by -1 does not raise error 6. It raises a native overflow exception that `On Error` does not handle, and the procedure stops at that line. The same division on **LongLong** returns the most negative **LongLong** unchanged, with no error. A **Variant** holding the **Integer** gives a **Long** 32,768.
+Dividing the most negative **Integer** (-32,768), **Long** (-2,147,483,648) or **LongLong** by -1 raises error 6, *Overflow*, because the quotient does not fit the type. It does so even where overflow checks are turned off, by the project setting or by [**IntegerOverflowChecks(False)**](Attributes#integeroverflowchecks). A **Variant** holding the **Integer** gives a **Long** 32,768 instead; one holding the **Long** or **LongLong** raises error 6.
 
 > [!NOTE]
 > **Decimal** can be a declared type in twinBASIC, and integer division keeps it: a declared **Decimal** on either side gives a **Decimal** *result*. In VBA, **Decimal** exists only inside a **Variant**. **LongLong** takes part in 32-bit builds as well; VBA has it only in 64-bit builds.
diff --git a/docs/Reference/Core/Mod.md b/docs/Reference/Core/Mod.md
index 72c026591..8b1888707 100644
--- a/docs/Reference/Core/Mod.md
+++ b/docs/Reference/Core/Mod.md
@@ -32,8 +32,7 @@ The *result* has the sign of *number1*: `-7 Mod 2` is -1, and `7 Mod -2` is 1.
 
 However, if any operand is **Null**, *result* is **Null**. Any operand that is **Empty** is treated as 0. Using 0 as *number2* raises error 11, *Division by zero*.
 
-> [!WARNING]
-> `Mod` with the most negative **Integer** (-32,768) or **Long** (-2,147,483,648) as *number1* and -1 as *number2* does not return 0. It raises a native overflow exception that `On Error` does not handle, and the procedure stops at that line.
+`Mod` with the most negative **Integer** (-32,768), **Long** (-2,147,483,648) or **LongLong** as *number1* and -1 as *number2* raises error 6, *Overflow*, even where overflow checks are turned off. In a **Variant**, the same operands give 0.
 
 > [!NOTE]
 > **Decimal** can be a declared type in twinBASIC, and `Mod` keeps it: a declared **Decimal** on either side gives a **Decimal** *result*. In VBA, **Decimal** exists only inside a **Variant**. **LongLong** takes part in 32-bit builds as well; VBA has it only in 64-bit builds.

From db1c1d7559e55a6a0642f090e9719656d791d37c Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Tue, 6 Oct 2026 01:48:06 +0200
Subject: [PATCH 36/42] IUnknown and IConnectionPoint state nominal behaviour
 without a build number

---
 docs/Reference/COM-Interfaces/IConnectionPoint.md | 2 +-
 docs/Reference/COM-Interfaces/IUnknown.md         | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/Reference/COM-Interfaces/IConnectionPoint.md b/docs/Reference/COM-Interfaces/IConnectionPoint.md
index c84b743cf..511feacf9 100644
--- a/docs/Reference/COM-Interfaces/IConnectionPoint.md
+++ b/docs/Reference/COM-Interfaces/IConnectionPoint.md
@@ -193,7 +193,7 @@ Raises `CONNECT_E_NOCONNECTION` (`&H80040200`) when the object has no outgoing i
 
 ## Events in twinBASIC
 
-A class that declares [**Event**](../../tB/Core/Event) members is a connectable object, and the compiler writes all of its connection point support. What it does, in BETA 995:
+A class that declares [**Event**](../../tB/Core/Event) members is a connectable object, and the compiler writes all of its connection point support. What it does:
 
 - **Every class answers for IConnectionPointContainer.** **QueryInterface**, and a [**Set**](../../tB/Core/Set) to a variable of the container type, succeed for a class with no events as they do for a class with events.
 - **A class with events has one connection point**, however many events it declares. **EnumConnectionPoints** returns it and **FindConnectionPoint** finds it by its interface identifier.
diff --git a/docs/Reference/COM-Interfaces/IUnknown.md b/docs/Reference/COM-Interfaces/IUnknown.md
index f5e6e1da1..2dec7a465 100644
--- a/docs/Reference/COM-Interfaces/IUnknown.md
+++ b/docs/Reference/COM-Interfaces/IUnknown.md
@@ -86,7 +86,7 @@ Calling **IUnknown** methods by hand is a low-level operation. A wrong slot numb
 
 ### Reference counts
 
-A twinBASIC object has one reference count, shared by every interface it is reached through. In BETA 995:
+A twinBASIC object has one reference count, shared by every interface it is reached through:
 
 | Operation | Effect on the count |
 |-----------|---------------------|

From d4eb981cf36ba8d6439fa89266dcee6b25adf6d5 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Tue, 6 Oct 2026 01:54:02 +0200
Subject: [PATCH 37/42] Two silent overflow defects on 997, with reproducers
 and VB6 sides: LLVM Double + - * ^ and a declared Single give Inf with no
 error; WARNINGs on the LLVM page and the operator pages; the LLVM
 error-handler NOTE to 997; Operators.md drops the stale \ exception

---
 BUGS-TO-REPORT.md                             | 112 ++++++++++++++++++
 .../llvm-double-overflow-no-error.twinproj    | Bin 0 -> 4276 bytes
 bugs/llvm-double-overflow-no-error/repro.json |  15 +++
 .../src/Settings                              |  61 ++++++++++
 .../src/Sources/Startup.twin                  |  44 +++++++
 .../vb6/Module1.bas                           |  29 +++++
 .../vb6/Probe.vbp                             |   7 ++
 bugs/single-overflow-no-error/repro.json      |  14 +++
 .../single-overflow-no-error.twinproj         | Bin 0 -> 3977 bytes
 bugs/single-overflow-no-error/src/Settings    |  61 ++++++++++
 .../src/Sources/Startup.twin                  |  30 +++++
 bugs/single-overflow-no-error/vb6/Module1.bas |  39 ++++++
 bugs/single-overflow-no-error/vb6/Probe.vbp   |   7 ++
 docs/LLVM/Getting-Started.md                  |   5 +-
 docs/Reference/Core/Divide.md                 |   3 +
 docs/Reference/Core/Minus.md                  |   3 +
 docs/Reference/Core/Multiply.md               |   3 +
 docs/Reference/Core/Plus.md                   |   3 +
 docs/Reference/Operators.md                   |   5 +-
 19 files changed, 439 insertions(+), 2 deletions(-)
 create mode 100644 bugs/llvm-double-overflow-no-error/llvm-double-overflow-no-error.twinproj
 create mode 100644 bugs/llvm-double-overflow-no-error/repro.json
 create mode 100644 bugs/llvm-double-overflow-no-error/src/Settings
 create mode 100644 bugs/llvm-double-overflow-no-error/src/Sources/Startup.twin
 create mode 100644 bugs/llvm-double-overflow-no-error/vb6/Module1.bas
 create mode 100644 bugs/llvm-double-overflow-no-error/vb6/Probe.vbp
 create mode 100644 bugs/single-overflow-no-error/repro.json
 create mode 100644 bugs/single-overflow-no-error/single-overflow-no-error.twinproj
 create mode 100644 bugs/single-overflow-no-error/src/Settings
 create mode 100644 bugs/single-overflow-no-error/src/Sources/Startup.twin
 create mode 100644 bugs/single-overflow-no-error/vb6/Module1.bas
 create mode 100644 bugs/single-overflow-no-error/vb6/Probe.vbp

diff --git a/BUGS-TO-REPORT.md b/BUGS-TO-REPORT.md
index 775f97ce2..417fefb8f 100644
--- a/BUGS-TO-REPORT.md
+++ b/BUGS-TO-REPORT.md
@@ -1874,3 +1874,115 @@ Only `onclick` was tried. The setter's test is on the name, so it applies to eve
 Severity: low. `AddEventListener` and inline handlers work, but an add-in that sets a handler property gets neither the handler nor an error.
 
 <!-- Reproducer: bugs/on-property-ignored/ (mode lane: an add-in has to be built into an IDE's add-in folder, which nothing here may do outside a lane, so `verify` runs the lane). Asserted by `addin-test.bat --only panes` (test/addin/panes.test.mjs, 'P4: a property whose name starts with "on" is dropped, and the add-in is told nothing'), which passes on BETA 995 and 997. The reproducer is a cut-down copy of that lane's PanesProbe add-in (test/addin/probes/panes), compiled clean on 997 by `bug_repro.mjs compile`, and not itself run in a lane. The setter source quoted is from BETA 997's ide/main.js. Stated in docs/Reference/Built-In/tbIDE/HtmlElementProperties.md, the NOTE that begins "A property whose name starts with `on` is ignored" (names BETA 997), and in WIP.HelpAddin.md (P4): when fixed, update that test and P4, and remove the NOTE or replace it with what the setter now does. -->
+
+---
+
+## LLVM-compiled code raises no error when a `Double` overflows, where it raises error 6 otherwise
+
+**Describe the bug**
+In a procedure compiled with LLVM, a `Double` addition, subtraction, multiplication or exponentiation whose result is too large for a `Double` raises no error: `Err.Number` stays 0 and the target holds infinity. The same statement in a procedure compiled without LLVM raises error 6 (*Overflow*), as VB6 does. A program that relies on error 6 to detect an overflow gets a silent `Inf` instead. No project setting and no other attribute is involved: the one difference is `[CompilerOptions("+llvm")]` on the procedure, or `tbrun --llvm` on the whole project. Observed in a run of the reproducer project.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `llvm-double-overflow-no-error.twinproj` (attached as `llvm-double-overflow-no-error.zip`). It needs an LLVM licence (Ultimate): `LlvmCases` is compiled with LLVM by its attribute. `PlainCases` holds the same statements without it. Each runs under `On Error Resume Next`, for example:
+   ```
+   [CompilerOptions("+llvm")]
+   Private Sub LlvmCases()
+       Dim big As Double = 1E+308
+       Dim r As Double
+       On Error Resume Next
+       r = 5#: Err.Clear: r = big * 10#
+       Debug.Print "LLVM   Double *   Err=" & Err.Number & " r=" & r
+   End Sub
+   ```
+2. Run it (F5) and read the DEBUG CONSOLE:
+   ```
+   plain  Double *   Err=6 r=1.#INF
+   plain  Double +   Err=6 r=1.#INF
+   plain  Double ^   Err=6
+   plain  Double /   Err=6 r=1.#INF
+   plain  1# / 0#    Err=11 r=1.#INF
+   plain  Long +     Err=6 l=5
+   LLVM   Double *   Err=0 r=1.#INF
+   LLVM   Double +   Err=0 r=1.#INF
+   LLVM   Double ^   Err=0
+   LLVM   Double /   Err=6 r=5
+   LLVM   1# / 0#    Err=11 r=5
+   LLVM   Long +     Err=6 l=5
+   ```
+
+**Expected behavior**
+Error 6 in LLVM-compiled code for every `Double` overflow, as in the same code without LLVM and in VB6 (attached as `llvm-double-overflow-no-error-vb6.zip`, which prints `Err=6` for the multiplication, the addition, the exponentiation and the division, and `Err=11` for `1# / 0#`).
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 997
+
+**Additional context**
+Also on BETA 995, identically, and on win32 and win64. Running the reproducer with `--llvm` compiles every procedure with LLVM and gives the `LLVM` results for both halves. With `[FloatingPointErrorChecks(True)]` on the LLVM procedure the multiplication still raises nothing.
+
+What does not reproduce it: a `Double` division that overflows (`1E+308 / 0.1`) raises 6, and so does `Exp(1000#)`, a `Long` overflow (`2147483647 + 1`) raises 6, and `1# / 0#` raises 11, all in LLVM-compiled code. So the overflow check is missing from the addition, subtraction, multiplication and `^` operators, not from the error path.
+
+A second difference shows in the same output. After a division that raises an error, LLVM-compiled code leaves the target unassigned: `r` is still 5 after `1# / 0#` (error 11) and after `1E+308 / 0.1` (error 6). Without LLVM the target is assigned infinity, `1.#INF`, and so it is in VB6 (`r=1.#INF` after each of its errors). Under `On Error Resume Next` the two builds then continue with different values.
+
+A `Single` addition, subtraction, multiplication or division that overflows raises no error without LLVM, where VB6 raises 6 (with LLVM the first three raise none either, and the division raises 6). That is a separate defect, with its own reproducer, in the entry "A `Single` that overflows raises no error, where VB6 raises error 6" (`bugs/single-overflow-no-error/`).
+
+Severity: a silent wrong result. An overflow that raises 6 in a debug run and no error in the LLVM-compiled build changes what a program computes, and nothing marks the difference.
+
+<!-- Reproducer: bugs/llvm-double-overflow-no-error/ (mode run: the LLVM procedure is compiled by its attribute, so `bug_repro.mjs run` needs no flag; expects the plain and LLVM lines above); verified on BETA 997 and 995 with `bug_repro.mjs run`, and on 997 with --llvm and --arch win64. VB6: `bug_repro.mjs vb6 llvm-double-overflow-no-error`. Not run in a built exe (Debug.Print writes nothing there). Originated in the p2 probes of 2026-10-06 (b_fpu_off). The docs/LLVM/Getting-Started.md section "Language support" carries a `> [!WARNING]` for it, naming BETA 997 (a silent wrong result, owner's rule); remove it once a fixed build is released. Related: the filed bugs/filed/llvm-err-after-raise (same page, a NOTE). The `Single` overflow without LLVM is its own entry, single-overflow-no-error. -->
+
+---
+
+## A `Single` that overflows raises no error, where VB6 raises error 6
+
+**Describe the bug**
+When a `Single` addition, subtraction, multiplication or division produces a result too large for a `Single`, twinBASIC raises no error and the target holds infinity: `s = sbig + sbig` with `sbig` at 3E+38 leaves `Err.Number` at 0 and `s` at `1.#INF`. VB6 raises error 6 (*Overflow*) for the same statement. The same holds for `+=` and `*=`, for `Single * Long` and for some `Single` constant expressions. A `Double` overflow raises 6, so a `Single` and a `Double` are treated differently. Observed in a run of the reproducer project.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `single-overflow-no-error.twinproj` (attached as `single-overflow-no-error.zip`). Its `Sub Main` runs each case under `On Error Resume Next`, for example:
+   ```
+   Dim sbig As Single = 3E+38!
+   Dim s As Single
+   On Error Resume Next
+   s = 5!: Err.Clear: s = sbig + sbig
+   Debug.Print "Single +        Err=" & Err.Number & " s=" & s
+   ```
+2. Run it (F5) and read the DEBUG CONSOLE:
+   ```
+   Single +        Err=0 s=1.#INF
+   Single -        Err=0 s=-1.#INF
+   Single *        Err=0 s=1.#INF
+   Single /        Err=0 s=1.#INF
+   Single * Long   Err=0 s=1.#INF
+   s = s + x       Err=0 s=1.#INF
+   s += x          Err=0 s=1.#INF
+   s = s * x       Err=0 s=1.#INF
+   s *= x          Err=0 s=1.#INF
+   CSng(Double)    Err=6 s=5
+   Single ^        Err=6 s=5
+   Variant *       Err=0 Double
+   Variant +       Err=0 Double
+   ```
+
+**Expected behavior**
+Error 6 for every `Single` arithmetic result that does not fit a `Single`, as in VB6 (attached as `single-overflow-no-error-vb6.zip`, which prints `Err=6 s=1.#INF` for `+`, `-`, `*`, `/`, `Single * Long`, `s = s + x` and `s = s * x`). The target is `1.#INF` after the error in both, so only the error is missing.
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 997
+
+**Additional context**
+Also on BETA 995, identically, and on win64 (which prints `inf` where win32 prints `1.#INF`). Compiled with LLVM, `+`, `-`, `*` and the compound forms are the same, and `/` raises 6, as in VB6.
+
+What matches VB6: a `Variant` holding a `Single` that overflows becomes a `Double` variant, with no error, in both (`Variant *`, `Variant +` above). `CSng` of a `Double` that is too large raises 6 in both. The result of `Single * Long` is a `Double` in both (`TypeName`), though twinBASIC stores it into a `Single` without an error.
+
+Where twinBASIC differs from VB6 in the other direction: `s = sbig ^ 2!` raises 6 in twinBASIC and gives `1.#INF` with no error in VB6, and so does assigning a `Double` that is too large to a `Single` (`s = 1E+300`: error 6 in twinBASIC, `1.#INF` with no error in VB6).
+
+A `Single` constant expression that overflows is refused by VB6 at compile time with *Overflow*. twinBASIC compiles some forms (`Const A As Single = 3E+38! * 10!`, and the `+`, `-` and `/` forms, in a project of their own) and refuses others with TB5002 (`^`, `CSng(1E+300)`, and `1E+300` assigned to a `Single`); which constants it refuses also changed with the other constants in the project, so that part is not in the reproducer.
+
+Severity: a silent wrong result. A `Single` overflow that ends the program or reaches a handler in VB6 gives `Inf` and carries on in twinBASIC.
+
+<!-- Reproducer: bugs/single-overflow-no-error/ (mode run; expects the `+`, `-`, `*`, `/`, `+=` and `CSng` lines above); verified on BETA 997 and 995 with `bug_repro.mjs run`, and on 997 with --llvm and --arch win64. VB6: `bug_repro.mjs vb6 single-overflow-no-error` (VB6 has no `+=`, so the file has `s = s + x`). The constant cases come from tbbuild on one-constant projects, and VB6's from `vb6run.mjs` on `Const` statements; neither is in the reproducer. Pages with wrong sentences: docs/Reference/Core/Divide.md line 31 ("A declared **Single** that overflows raises error 6"), and the sentence "A declared (non-**Variant**) result that overflows raises error 6" in Plus.md, Minus.md and Multiply.md, and docs/Reference/Operators.md line 135 ("A result that does not fit its type raises error 6"); each of Divide.md, Plus.md, Minus.md, Multiply.md and Operators.md (after its porting table) carries a `> [!WARNING]` naming BETA 997 (a silent wrong result, owner's rule); remove them once a fixed build is released. The variant rows (Plus.md line 54, Minus.md line 34, Multiply.md line 32, Divide.md line 31's second clause) and the result-type rows for Single and Long are right. Exponent.md says nothing about overflow. Related: llvm-double-overflow-no-error (the `Double` overflow under LLVM). -->
+
+
diff --git a/bugs/llvm-double-overflow-no-error/llvm-double-overflow-no-error.twinproj b/bugs/llvm-double-overflow-no-error/llvm-double-overflow-no-error.twinproj
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z(!9}{Im*X-CT%g)O~q*Mj5ZvKl`o#*-Du&HkFf<A_3d#i=l-dje=T@BJ}E>^T2!Hr
d*JM@-1NPeIv}317L;R10OEjn6D_lqC<Uj0adTjsz

literal 0
HcmV?d00001

diff --git a/bugs/llvm-double-overflow-no-error/repro.json b/bugs/llvm-double-overflow-no-error/repro.json
new file mode 100644
index 000000000..608117a1b
--- /dev/null
+++ b/bugs/llvm-double-overflow-no-error/repro.json
@@ -0,0 +1,15 @@
+{
+  "mode": "run",
+  "expect": {
+    "exit": 0,
+    "output": [
+      "^plain\\s+Double \\*\\s+Err=6 r=1\\.#INF$",
+      "^plain\\s+Double \\+\\s+Err=6 r=1\\.#INF$",
+      "^LLVM\\s+Double \\*\\s+Err=0 r=1\\.#INF$",
+      "^LLVM\\s+Double \\+\\s+Err=0 r=1\\.#INF$",
+      "^LLVM\\s+Double \\^\\s+Err=0$",
+      "^LLVM\\s+Double /\\s+Err=6 r=5$",
+      "^LLVM\\s+1# / 0#\\s+Err=11 r=5$"
+    ]
+  }
+}
diff --git a/bugs/llvm-double-overflow-no-error/src/Settings b/bugs/llvm-double-overflow-no-error/src/Settings
new file mode 100644
index 000000000..8682f7dee
--- /dev/null
+++ b/bugs/llvm-double-overflow-no-error/src/Settings
@@ -0,0 +1,61 @@
+{
+	"configuration.inherits": "Defaults",
+	"project.appTitle": "LlvmDoubleOverflowNoError",
+	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
+	"project.buildType": "Standard EXE",
+	"project.description": "Reproduces: Double overflow raises no error in LLVM-compiled code, where it raises error 6 otherwise",
+	"project.exportPathIsV2": true,
+	"project.id": "{435AF0D4-D4C0-427F-ACDC-4B52412E8B55}",
+	"project.name": "LlvmDoubleOverflowNoError",
+	"project.optionExplicit": true,
+	"project.references": [
+		{
+			"id": "{00020430-0000-0000-C000-000000000046}",
+			"lcid": 0,
+			"name": "OLE Automation",
+			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
+			"path64": "C:\\Windows\\System32\\stdole2.tlb",
+			"symbolId": "stdole",
+			"versionMajor": 2,
+			"versionMinor": 0
+		},
+		{
+			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "VB",
+			"versionBuild": 0,
+			"versionMajor": 0,
+			"versionMinor": 0,
+			"versionRevision": 31
+		},
+		{
+			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "AppGlobalClassProject",
+			"versionBuild": 0,
+			"versionMajor": 1,
+			"versionMinor": 0,
+			"versionRevision": 0
+		}
+	],
+	"project.settingsVersion": 1,
+	"project.startupObject": "Sub Main",
+	"project.warnings": {
+		"errors": [],
+		"hints": [],
+		"ignored": [],
+		"info": [],
+		"warnings": []
+	},
+	"runtime.useUnicodeStandardLibrary": true
+}
diff --git a/bugs/llvm-double-overflow-no-error/src/Sources/Startup.twin b/bugs/llvm-double-overflow-no-error/src/Sources/Startup.twin
new file mode 100644
index 000000000..5bd7dd56f
--- /dev/null
+++ b/bugs/llvm-double-overflow-no-error/src/Sources/Startup.twin
@@ -0,0 +1,44 @@
+' Double overflow raises no error in an LLVM-compiled procedure.
+' Needs an LLVM licence (Ultimate): LlvmCases is compiled with LLVM by its [CompilerOptions("+llvm")].
+' No project setting and no other attribute is involved.
+Module Startup
+
+    Private Sub PlainCases()
+        Dim big As Double = 1E+308
+        Dim z As Double = 0#
+        Dim lmax As Long = 2147483647
+        Dim r As Double
+        Dim l As Long
+        Dim n As Long
+        On Error Resume Next
+        r = 5#: Err.Clear: r = big * 10#: n = Err.Number: Debug.Print "plain  Double *   Err=" & n & " r=" & r
+        r = 5#: Err.Clear: r = big + big: n = Err.Number: Debug.Print "plain  Double +   Err=" & n & " r=" & r
+        r = 5#: Err.Clear: r = 10# ^ 400#: n = Err.Number: Debug.Print "plain  Double ^   Err=" & n
+        r = 5#: Err.Clear: r = big / 0.1: n = Err.Number: Debug.Print "plain  Double /   Err=" & n & " r=" & r
+        r = 5#: Err.Clear: r = 1# / z: n = Err.Number: Debug.Print "plain  1# / 0#    Err=" & n & " r=" & r
+        l = 5: Err.Clear: l = lmax + 1: n = Err.Number: Debug.Print "plain  Long +     Err=" & n & " l=" & l
+    End Sub
+
+    [CompilerOptions("+llvm")]
+    Private Sub LlvmCases()
+        Dim big As Double = 1E+308
+        Dim z As Double = 0#
+        Dim lmax As Long = 2147483647
+        Dim r As Double
+        Dim l As Long
+        Dim n As Long
+        On Error Resume Next
+        r = 5#: Err.Clear: r = big * 10#: n = Err.Number: Debug.Print "LLVM   Double *   Err=" & n & " r=" & r
+        r = 5#: Err.Clear: r = big + big: n = Err.Number: Debug.Print "LLVM   Double +   Err=" & n & " r=" & r
+        r = 5#: Err.Clear: r = 10# ^ 400#: n = Err.Number: Debug.Print "LLVM   Double ^   Err=" & n
+        r = 5#: Err.Clear: r = big / 0.1: n = Err.Number: Debug.Print "LLVM   Double /   Err=" & n & " r=" & r
+        r = 5#: Err.Clear: r = 1# / z: n = Err.Number: Debug.Print "LLVM   1# / 0#    Err=" & n & " r=" & r
+        l = 5: Err.Clear: l = lmax + 1: n = Err.Number: Debug.Print "LLVM   Long +     Err=" & n & " l=" & l
+    End Sub
+
+    Public Sub Main()
+        PlainCases
+        LlvmCases
+    End Sub
+
+End Module
diff --git a/bugs/llvm-double-overflow-no-error/vb6/Module1.bas b/bugs/llvm-double-overflow-no-error/vb6/Module1.bas
new file mode 100644
index 000000000..ff006f2ed
--- /dev/null
+++ b/bugs/llvm-double-overflow-no-error/vb6/Module1.bas
@@ -0,0 +1,29 @@
+Attribute VB_Name = "Module1"
+Option Explicit
+
+Sub Main()
+    Dim big As Double
+    Dim z As Double
+    Dim lmax As Long
+    Dim r As Double
+    Dim l As Long
+    Dim n As Long
+    On Error GoTo Fail
+    Open App.Path & "\out.txt" For Output As #9
+    big = 1E+308
+    z = 0#
+    lmax = 2147483647
+    On Error Resume Next
+    r = 5#: Err.Clear: r = big * 10#: n = Err.Number: Print #9, "VB6    Double *   Err=" & n & " r=" & r
+    r = 5#: Err.Clear: r = big + big: n = Err.Number: Print #9, "VB6    Double +   Err=" & n & " r=" & r
+    r = 5#: Err.Clear: r = 10# ^ 400#: n = Err.Number: Print #9, "VB6    Double ^   Err=" & n
+    r = 5#: Err.Clear: r = big / 0.1: n = Err.Number: Print #9, "VB6    Double /   Err=" & n & " r=" & r
+    r = 5#: Err.Clear: r = 1# / z: n = Err.Number: Print #9, "VB6    1# / 0#    Err=" & n & " r=" & r
+    l = 5: Err.Clear: l = lmax + 1: n = Err.Number: Print #9, "VB6    Long +     Err=" & n & " l=" & l
+    Close #9
+    Exit Sub
+Fail:
+    On Error Resume Next
+    Print #9, "unhandled error " & Err.Number & ": " & Err.Description
+    Close #9
+End Sub
diff --git a/bugs/llvm-double-overflow-no-error/vb6/Probe.vbp b/bugs/llvm-double-overflow-no-error/vb6/Probe.vbp
new file mode 100644
index 000000000..4d210b0e8
--- /dev/null
+++ b/bugs/llvm-double-overflow-no-error/vb6/Probe.vbp
@@ -0,0 +1,7 @@
+Type=Exe
+Module=Module1; Module1.bas
+Startup="Sub Main"
+ExeName32="Probe.exe"
+Name="Probe"
+CompilationType=0
+OptimizationType=0
diff --git a/bugs/single-overflow-no-error/repro.json b/bugs/single-overflow-no-error/repro.json
new file mode 100644
index 000000000..ae91f9abe
--- /dev/null
+++ b/bugs/single-overflow-no-error/repro.json
@@ -0,0 +1,14 @@
+{
+  "mode": "run",
+  "expect": {
+    "exit": 0,
+    "output": [
+      "^Single \\+\\s+Err=0 s=1\\.#INF$",
+      "^Single -\\s+Err=0 s=-1\\.#INF$",
+      "^Single \\*\\s+Err=0 s=1\\.#INF$",
+      "^Single /\\s+Err=0 s=1\\.#INF$",
+      "^s \\+= x\\s+Err=0 s=1\\.#INF$",
+      "^CSng\\(Double\\)\\s+Err=6 s=5$"
+    ]
+  }
+}
diff --git a/bugs/single-overflow-no-error/single-overflow-no-error.twinproj b/bugs/single-overflow-no-error/single-overflow-no-error.twinproj
new file mode 100644
index 0000000000000000000000000000000000000000..080d6c8ff916e9ecd094fa0cddd43dbbe1ce2aec
GIT binary patch
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m%jrX!mmv?>m=;1sf8)#*9))j1UH79e<{2!<vzNQm7vO&kKq1Ef

literal 0
HcmV?d00001

diff --git a/bugs/single-overflow-no-error/src/Settings b/bugs/single-overflow-no-error/src/Settings
new file mode 100644
index 000000000..cd2dc96f7
--- /dev/null
+++ b/bugs/single-overflow-no-error/src/Settings
@@ -0,0 +1,61 @@
+{
+	"configuration.inherits": "Defaults",
+	"project.appTitle": "SingleOverflowNoError",
+	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
+	"project.buildType": "Standard EXE",
+	"project.description": "Reproduces: Single overflow raises no error, where VB6 raises error 6",
+	"project.exportPathIsV2": true,
+	"project.id": "{1CB427D1-0FF2-49BF-8020-6506C006BB8F}",
+	"project.name": "SingleOverflowNoError",
+	"project.optionExplicit": true,
+	"project.references": [
+		{
+			"id": "{00020430-0000-0000-C000-000000000046}",
+			"lcid": 0,
+			"name": "OLE Automation",
+			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
+			"path64": "C:\\Windows\\System32\\stdole2.tlb",
+			"symbolId": "stdole",
+			"versionMajor": 2,
+			"versionMinor": 0
+		},
+		{
+			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "VB",
+			"versionBuild": 0,
+			"versionMajor": 0,
+			"versionMinor": 0,
+			"versionRevision": 31
+		},
+		{
+			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "AppGlobalClassProject",
+			"versionBuild": 0,
+			"versionMajor": 1,
+			"versionMinor": 0,
+			"versionRevision": 0
+		}
+	],
+	"project.settingsVersion": 1,
+	"project.startupObject": "Sub Main",
+	"project.warnings": {
+		"errors": [],
+		"hints": [],
+		"ignored": [],
+		"info": [],
+		"warnings": []
+	},
+	"runtime.useUnicodeStandardLibrary": true
+}
diff --git a/bugs/single-overflow-no-error/src/Sources/Startup.twin b/bugs/single-overflow-no-error/src/Sources/Startup.twin
new file mode 100644
index 000000000..0b47e6cb8
--- /dev/null
+++ b/bugs/single-overflow-no-error/src/Sources/Startup.twin
@@ -0,0 +1,30 @@
+' A Single that overflows raises no error: each way of overflowing one.
+Module Startup
+
+    Public Sub Main()
+        Dim sbig As Single = 3E+38!
+        Dim nbig As Single = -3E+38!
+        Dim tiny As Single = 1E-10!
+        Dim dbig As Double = 1E+300
+        Dim s As Single
+        Dim n As Long
+        Dim v As Variant
+        Dim vr As Variant
+        Dim lten As Long = 10
+        On Error Resume Next
+        s = 5!: Err.Clear: s = sbig + sbig: n = Err.Number: Debug.Print "Single +        Err=" & n & " s=" & s
+        s = 5!: Err.Clear: s = nbig - sbig: n = Err.Number: Debug.Print "Single -        Err=" & n & " s=" & s
+        s = 5!: Err.Clear: s = sbig * 10!: n = Err.Number: Debug.Print "Single *        Err=" & n & " s=" & s
+        s = 5!: Err.Clear: s = sbig / tiny: n = Err.Number: Debug.Print "Single /        Err=" & n & " s=" & s
+        s = 5!: Err.Clear: s = sbig * lten: n = Err.Number: Debug.Print "Single * Long   Err=" & n & " s=" & s
+        s = sbig: Err.Clear: s = s + sbig: n = Err.Number: Debug.Print "s = s + x       Err=" & n & " s=" & s
+        s = sbig: Err.Clear: s += sbig: n = Err.Number: Debug.Print "s += x          Err=" & n & " s=" & s
+        s = sbig: Err.Clear: s = s * 10!: n = Err.Number: Debug.Print "s = s * x       Err=" & n & " s=" & s
+        s = sbig: Err.Clear: s *= 10!: n = Err.Number: Debug.Print "s *= x          Err=" & n & " s=" & s
+        s = 5!: Err.Clear: s = CSng(dbig): n = Err.Number: Debug.Print "CSng(Double)    Err=" & n & " s=" & s
+        s = 5!: Err.Clear: s = sbig ^ 2!: n = Err.Number: Debug.Print "Single ^        Err=" & n & " s=" & s
+        v = sbig: vr = 5!: Err.Clear: vr = v * 10!: n = Err.Number: Debug.Print "Variant *       Err=" & n & " " & TypeName(vr)
+        v = sbig: vr = 5!: Err.Clear: vr = v + v: n = Err.Number: Debug.Print "Variant +       Err=" & n & " " & TypeName(vr)
+    End Sub
+
+End Module
diff --git a/bugs/single-overflow-no-error/vb6/Module1.bas b/bugs/single-overflow-no-error/vb6/Module1.bas
new file mode 100644
index 000000000..b7cdf104b
--- /dev/null
+++ b/bugs/single-overflow-no-error/vb6/Module1.bas
@@ -0,0 +1,39 @@
+Attribute VB_Name = "Module1"
+Option Explicit
+
+Sub Main()
+    Dim sbig As Single
+    Dim nbig As Single
+    Dim tiny As Single
+    Dim dbig As Double
+    Dim s As Single
+    Dim n As Long
+    Dim v As Variant
+    Dim vr As Variant
+    Dim lten As Long
+    On Error GoTo Fail
+    Open App.Path & "\out.txt" For Output As #9
+    sbig = 3E+38
+    nbig = -3E+38
+    tiny = 1E-10
+    dbig = 1E+300
+    lten = 10
+    On Error Resume Next
+    s = 5!: Err.Clear: s = sbig + sbig: n = Err.Number: Print #9, "Single +        Err=" & n & " s=" & s
+    s = 5!: Err.Clear: s = nbig - sbig: n = Err.Number: Print #9, "Single -        Err=" & n & " s=" & s
+    s = 5!: Err.Clear: s = sbig * 10!: n = Err.Number: Print #9, "Single *        Err=" & n & " s=" & s
+    s = 5!: Err.Clear: s = sbig / tiny: n = Err.Number: Print #9, "Single /        Err=" & n & " s=" & s
+    s = 5!: Err.Clear: s = sbig * lten: n = Err.Number: Print #9, "Single * Long   Err=" & n & " s=" & s
+    s = sbig: Err.Clear: s = s + sbig: n = Err.Number: Print #9, "s = s + x       Err=" & n & " s=" & s
+    s = sbig: Err.Clear: s = s * 10!: n = Err.Number: Print #9, "s = s * x       Err=" & n & " s=" & s
+    s = 5!: Err.Clear: s = CSng(dbig): n = Err.Number: Print #9, "CSng(Double)    Err=" & n & " s=" & s
+    s = 5!: Err.Clear: s = sbig ^ 2!: n = Err.Number: Print #9, "Single ^        Err=" & n & " s=" & s
+    v = sbig: vr = 5!: Err.Clear: vr = v * 10!: n = Err.Number: Print #9, "Variant *       Err=" & n & " " & TypeName(vr)
+    v = sbig: vr = 5!: Err.Clear: vr = v + v: n = Err.Number: Print #9, "Variant +       Err=" & n & " " & TypeName(vr)
+    Close #9
+    Exit Sub
+Fail:
+    On Error Resume Next
+    Print #9, "unhandled error " & Err.Number & ": " & Err.Description
+    Close #9
+End Sub
diff --git a/bugs/single-overflow-no-error/vb6/Probe.vbp b/bugs/single-overflow-no-error/vb6/Probe.vbp
new file mode 100644
index 000000000..4d210b0e8
--- /dev/null
+++ b/bugs/single-overflow-no-error/vb6/Probe.vbp
@@ -0,0 +1,7 @@
+Type=Exe
+Module=Module1; Module1.bas
+Startup="Sub Main"
+ExeName32="Probe.exe"
+Name="Probe"
+CompilationType=0
+OptimizationType=0
diff --git a/docs/LLVM/Getting-Started.md b/docs/LLVM/Getting-Started.md
index 45c25a4dd..fec06ac9a 100644
--- a/docs/LLVM/Getting-Started.md
+++ b/docs/LLVM/Getting-Started.md
@@ -58,7 +58,10 @@ Building with LLVM does not currently work on Windows 7; Windows 10 or 11 is rec
 The main feature not yet supported is passing an error up to the calling procedure. If an error occurs in a procedure that has no error handler, its caller does not receive the error when either of the two procedures is compiled with LLVM: the caller's own `On Error` statement does not catch it. Instead, a built program stops as it does for an unhandled error, and a run in the IDE ends without a message. A fix is planned.
 
 > [!NOTE]
-> In twinBASIC BETA 995, an error handler in a procedure compiled with LLVM cannot read an error raised with [**Err.Raise**](../tB/Modules/ErrObject/Raise) in that procedure: **Err.Number** returns -353703423 (`&HEAEAEA01`), **Err.Source** is empty, and **Err.Description** is the generic "Application-defined or object-defined error". An error that a statement causes, such as a division by zero, is read correctly.
+> In twinBASIC BETA 997, an error handler in a procedure compiled with LLVM cannot read an error raised with [**Err.Raise**](../tB/Modules/ErrObject/Raise) in that procedure: **Err.Number** returns -353703423 (`&HEAEAEA01`), **Err.Source** is empty, and **Err.Description** is the generic "Application-defined or object-defined error". An error that a statement causes, such as a division by zero, is read correctly.
+
+> [!WARNING]
+> In twinBASIC BETA 997, a **Double** addition, subtraction, multiplication or exponentiation (`^`) that overflows raises no error in code compiled with LLVM: the result is infinity (`1.#INF`), where the same code compiled without LLVM raises error 6, *Overflow*. [**FloatingPointErrorChecks(True)**](../tB/Core/Attributes#floatingpointerrorchecks) does not change this. A **Double** division that overflows, and a division by zero, still raise their errors. After either, under `On Error Resume Next`, the variable that was to receive the result keeps its old value; without LLVM it holds infinity.
 
 Code compiled with LLVM ignores [**Debug.Assert**](../tB/Modules/Debug#assert): the statement does not stop, and its condition is not evaluated.
 
diff --git a/docs/Reference/Core/Divide.md b/docs/Reference/Core/Divide.md
index 25c49ba3a..5d2ea5383 100644
--- a/docs/Reference/Core/Divide.md
+++ b/docs/Reference/Core/Divide.md
@@ -36,6 +36,9 @@ A **Single** divided by a **Long**, **LongLong**, **Double**, **Currency** or **
 
 Dividing by zero raises error 11, *Division by zero*, and zero divided by zero raises error 6, *Overflow*. Use [**\\**](IntegerDivide) for truncating-integer division and [**Mod**](Mod) for remainder.
 
+> [!WARNING]
+> In twinBASIC BETA 997, a division whose result is a declared **Single** raises no error when the result overflows: the **Single** holds infinity (`1.#INF`) instead. Compiled with LLVM, the division raises error 6 as it should. Declare the variable **Double** where an overflow must be caught.
+
 > [!NOTE]
 > **Decimal** can be a declared type in twinBASIC, so dividing by or into a declared **Decimal** gives a declared **Decimal**. In VBA, **Decimal** exists only inside a **Variant**.
 
diff --git a/docs/Reference/Core/Minus.md b/docs/Reference/Core/Minus.md
index df8f98d2f..4ff3f567c 100644
--- a/docs/Reference/Core/Minus.md
+++ b/docs/Reference/Core/Minus.md
@@ -39,6 +39,9 @@ The data type of *result* is usually the same as that of the most precise expres
 
 A declared (non-**Variant**) result that overflows raises error 6, *Overflow*. If one or both expressions are **Null** expressions, *result* is **Null**. If an expression is **Empty**, it is treated as 0.
 
+> [!WARNING]
+> In twinBASIC BETA 997, a subtraction whose result is a declared **Single** raises no error when the result overflows: the **Single** holds infinity (`1.#INF`) instead. The compound form **-=** does the same. Declare the variable **Double** where an overflow must be caught.
+
 > [!NOTE]
 > The order of precision used by addition and subtraction is not the same as the order of precision used by multiplication.
 
diff --git a/docs/Reference/Core/Multiply.md b/docs/Reference/Core/Multiply.md
index 875d6895f..77823caf0 100644
--- a/docs/Reference/Core/Multiply.md
+++ b/docs/Reference/Core/Multiply.md
@@ -35,6 +35,9 @@ The data type of *result* is usually the same as that of the most precise expres
 
 A declared (non-**Variant**) result that overflows raises error 6, *Overflow*. If one or both expressions are **Null** expressions, *result* is **Null**. If an expression is **Empty**, it is treated as 0.
 
+> [!WARNING]
+> In twinBASIC BETA 997, a multiplication whose result is a declared **Single** raises no error when the result overflows: the **Single** holds infinity (`1.#INF`) instead. The compound form ***=** does the same. Declare the variable **Double** where an overflow must be caught.
+
 > [!NOTE]
 > The order of precision used by multiplication is not the same as the order of precision used by addition and subtraction.
 
diff --git a/docs/Reference/Core/Plus.md b/docs/Reference/Core/Plus.md
index 18a4ed19a..91bd080c9 100644
--- a/docs/Reference/Core/Plus.md
+++ b/docs/Reference/Core/Plus.md
@@ -58,6 +58,9 @@ For simple arithmetic addition involving only numeric expressions, the data type
 
 A declared (non-**Variant**) result that overflows raises error 6, *Overflow*. If one or both expressions are **Null** expressions, *result* is **Null**. If both expressions are **Empty**, *result* is an **Integer**. However, if only one expression is **Empty**, the other expression is returned unchanged as *result*.
 
+> [!WARNING]
+> In twinBASIC BETA 997, an addition whose result is a declared **Single** raises no error when the result overflows: the **Single** holds infinity (`1.#INF`) instead. The compound form **+=** does the same. Declare the variable **Double** where an overflow must be caught.
+
 > [!NOTE]
 > The order of precision used by addition and subtraction is not the same as the order of precision used by multiplication.
 
diff --git a/docs/Reference/Operators.md b/docs/Reference/Operators.md
index fd701916e..b99824bb8 100644
--- a/docs/Reference/Operators.md
+++ b/docs/Reference/Operators.md
@@ -132,7 +132,7 @@ The other operators:
 | `&` | **String** |
 | unary `-` | the operand's own type, except **Integer** for a **Byte** or **Boolean** and **Double** for a **String** |
 
-A result that does not fit its type raises error 6, *Overflow*, with one exception described under [the **\\** operator](../tB/Core/IntegerDivide). Some combinations that matter when porting code:
+A result that does not fit its type raises error 6, *Overflow*. Some combinations that matter when porting code:
 
 | Expression | Result |
 |:-----------|:-------|
@@ -147,6 +147,9 @@ A result that does not fit its type raises error 6, *Overflow*, with one excepti
 | **Date** `+` **Integer** | **Date** |
 | **String** `+` **Integer** | **Double**: `"34" + 6` is 40 |
 
+> [!WARNING]
+> In twinBASIC BETA 997, an addition, subtraction, multiplication or division whose result is a declared **Single** raises no error when the result overflows: the **Single** holds infinity (`1.#INF`) instead. Declare the variable **Double** where an overflow must be caught. Code compiled with LLVM has a similar defect for **Double**; see [Language support](../LLVM/Getting-Started#language-support).
+
 ### Variant operands
 
 When either operand is a **Variant**, the result is a **Variant**, and the value it holds has the type the rules above give for the values the operands hold: a **Variant** holding a **Decimal** times an **Integer** holds a **Decimal**. The differences:

From 7e0a15cd87c9d45359db50fa879aa399491856d5 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Tue, 6 Oct 2026 01:57:04 +0200
Subject: [PATCH 38/42] Where twinBASIC and VB6 differ on Single and Double
 overflow, the pages say what VB6 does; Data-Types notes that a too-large
 value assigned to a Single raises error 6, where VB6 stores infinity

---
 docs/LLVM/Getting-Started.md    | 2 +-
 docs/Reference/Core/Divide.md   | 2 +-
 docs/Reference/Core/Minus.md    | 2 +-
 docs/Reference/Core/Multiply.md | 2 +-
 docs/Reference/Core/Plus.md     | 2 +-
 docs/Reference/Data-Types.md    | 5 +++++
 docs/Reference/Operators.md     | 2 +-
 7 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/docs/LLVM/Getting-Started.md b/docs/LLVM/Getting-Started.md
index fec06ac9a..d3a8f4b2a 100644
--- a/docs/LLVM/Getting-Started.md
+++ b/docs/LLVM/Getting-Started.md
@@ -61,7 +61,7 @@ The main feature not yet supported is passing an error up to the calling procedu
 > In twinBASIC BETA 997, an error handler in a procedure compiled with LLVM cannot read an error raised with [**Err.Raise**](../tB/Modules/ErrObject/Raise) in that procedure: **Err.Number** returns -353703423 (`&HEAEAEA01`), **Err.Source** is empty, and **Err.Description** is the generic "Application-defined or object-defined error". An error that a statement causes, such as a division by zero, is read correctly.
 
 > [!WARNING]
-> In twinBASIC BETA 997, a **Double** addition, subtraction, multiplication or exponentiation (`^`) that overflows raises no error in code compiled with LLVM: the result is infinity (`1.#INF`), where the same code compiled without LLVM raises error 6, *Overflow*. [**FloatingPointErrorChecks(True)**](../tB/Core/Attributes#floatingpointerrorchecks) does not change this. A **Double** division that overflows, and a division by zero, still raise their errors. After either, under `On Error Resume Next`, the variable that was to receive the result keeps its old value; without LLVM it holds infinity.
+> In twinBASIC BETA 997, a **Double** addition, subtraction, multiplication or exponentiation (`^`) that overflows raises no error in code compiled with LLVM: the result is infinity (`1.#INF`), where the same code compiled without LLVM raises error 6, *Overflow*, as VB6 does. [**FloatingPointErrorChecks(True)**](../tB/Core/Attributes#floatingpointerrorchecks) does not change this. A **Double** division that overflows, and a division by zero, still raise their errors. After either, under `On Error Resume Next`, the variable that was to receive the result keeps its old value; without LLVM it holds infinity.
 
 Code compiled with LLVM ignores [**Debug.Assert**](../tB/Modules/Debug#assert): the statement does not stop, and its condition is not evaluated.
 
diff --git a/docs/Reference/Core/Divide.md b/docs/Reference/Core/Divide.md
index 5d2ea5383..4e438048f 100644
--- a/docs/Reference/Core/Divide.md
+++ b/docs/Reference/Core/Divide.md
@@ -37,7 +37,7 @@ A **Single** divided by a **Long**, **LongLong**, **Double**, **Currency** or **
 Dividing by zero raises error 11, *Division by zero*, and zero divided by zero raises error 6, *Overflow*. Use [**\\**](IntegerDivide) for truncating-integer division and [**Mod**](Mod) for remainder.
 
 > [!WARNING]
-> In twinBASIC BETA 997, a division whose result is a declared **Single** raises no error when the result overflows: the **Single** holds infinity (`1.#INF`) instead. Compiled with LLVM, the division raises error 6 as it should. Declare the variable **Double** where an overflow must be caught.
+> In twinBASIC BETA 997, a division whose result is a declared **Single** raises no error when the result overflows: the **Single** holds infinity (`1.#INF`) instead. VB6 raises error 6, *Overflow*. Compiled with LLVM, the division raises error 6 as it should. Declare the variable **Double** where an overflow must be caught.
 
 > [!NOTE]
 > **Decimal** can be a declared type in twinBASIC, so dividing by or into a declared **Decimal** gives a declared **Decimal**. In VBA, **Decimal** exists only inside a **Variant**.
diff --git a/docs/Reference/Core/Minus.md b/docs/Reference/Core/Minus.md
index 4ff3f567c..f251e4221 100644
--- a/docs/Reference/Core/Minus.md
+++ b/docs/Reference/Core/Minus.md
@@ -40,7 +40,7 @@ The data type of *result* is usually the same as that of the most precise expres
 A declared (non-**Variant**) result that overflows raises error 6, *Overflow*. If one or both expressions are **Null** expressions, *result* is **Null**. If an expression is **Empty**, it is treated as 0.
 
 > [!WARNING]
-> In twinBASIC BETA 997, a subtraction whose result is a declared **Single** raises no error when the result overflows: the **Single** holds infinity (`1.#INF`) instead. The compound form **-=** does the same. Declare the variable **Double** where an overflow must be caught.
+> In twinBASIC BETA 997, a subtraction whose result is a declared **Single** raises no error when the result overflows: the **Single** holds infinity (`1.#INF`) instead. VB6 raises error 6, *Overflow*. The compound form **-=** does the same. Declare the variable **Double** where an overflow must be caught.
 
 > [!NOTE]
 > The order of precision used by addition and subtraction is not the same as the order of precision used by multiplication.
diff --git a/docs/Reference/Core/Multiply.md b/docs/Reference/Core/Multiply.md
index 77823caf0..2d0612517 100644
--- a/docs/Reference/Core/Multiply.md
+++ b/docs/Reference/Core/Multiply.md
@@ -36,7 +36,7 @@ The data type of *result* is usually the same as that of the most precise expres
 A declared (non-**Variant**) result that overflows raises error 6, *Overflow*. If one or both expressions are **Null** expressions, *result* is **Null**. If an expression is **Empty**, it is treated as 0.
 
 > [!WARNING]
-> In twinBASIC BETA 997, a multiplication whose result is a declared **Single** raises no error when the result overflows: the **Single** holds infinity (`1.#INF`) instead. The compound form ***=** does the same. Declare the variable **Double** where an overflow must be caught.
+> In twinBASIC BETA 997, a multiplication whose result is a declared **Single** raises no error when the result overflows: the **Single** holds infinity (`1.#INF`) instead. VB6 raises error 6, *Overflow*. The compound form ***=** does the same. Declare the variable **Double** where an overflow must be caught.
 
 > [!NOTE]
 > The order of precision used by multiplication is not the same as the order of precision used by addition and subtraction.
diff --git a/docs/Reference/Core/Plus.md b/docs/Reference/Core/Plus.md
index 91bd080c9..57cb69e21 100644
--- a/docs/Reference/Core/Plus.md
+++ b/docs/Reference/Core/Plus.md
@@ -59,7 +59,7 @@ For simple arithmetic addition involving only numeric expressions, the data type
 A declared (non-**Variant**) result that overflows raises error 6, *Overflow*. If one or both expressions are **Null** expressions, *result* is **Null**. If both expressions are **Empty**, *result* is an **Integer**. However, if only one expression is **Empty**, the other expression is returned unchanged as *result*.
 
 > [!WARNING]
-> In twinBASIC BETA 997, an addition whose result is a declared **Single** raises no error when the result overflows: the **Single** holds infinity (`1.#INF`) instead. The compound form **+=** does the same. Declare the variable **Double** where an overflow must be caught.
+> In twinBASIC BETA 997, an addition whose result is a declared **Single** raises no error when the result overflows: the **Single** holds infinity (`1.#INF`) instead. VB6 raises error 6, *Overflow*. The compound form **+=** does the same. Declare the variable **Double** where an overflow must be caught.
 
 > [!NOTE]
 > The order of precision used by addition and subtraction is not the same as the order of precision used by multiplication.
diff --git a/docs/Reference/Data-Types.md b/docs/Reference/Data-Types.md
index b1a22266d..be2d88a91 100644
--- a/docs/Reference/Data-Types.md
+++ b/docs/Reference/Data-Types.md
@@ -64,6 +64,11 @@ Integer overflow raises a run-time error (error 6) by default. Overflow does not
 
 **Single** is accurate to approximately 6--7 significant decimal digits. It is smaller and may be faster in tight loops, but the reduced precision makes it unsuitable for financial or scientific calculations where rounding error matters.
 
+Assigning a value too large for a **Single** to a **Single** variable raises error 6, *Overflow*: `s = 1E+300` does, and so does `s = x ^ 2` when the **Double** result is too large.
+
+> [!NOTE]
+> VB6 raises no error for these assignments: the **Single** holds infinity (`1.#INF`).
+
 **Currency** is a fixed-point type, stored internally as a 64-bit signed integer scaled by 10,000. It avoids the binary rounding errors of IEEE 754 types and has exactly four decimal places; a value with more places is rounded to four, and a value exactly halfway is rounded to the even digit, so `CCur("0.12345")` is 0.1234. It suits monetary values whose amounts and intermediate results never need more than four decimal places --- [Decimal or Currency for money](#decimal-or-currency-for-money) compares the two types.
 
 ---
diff --git a/docs/Reference/Operators.md b/docs/Reference/Operators.md
index b99824bb8..282cb983f 100644
--- a/docs/Reference/Operators.md
+++ b/docs/Reference/Operators.md
@@ -148,7 +148,7 @@ A result that does not fit its type raises error 6, *Overflow*. Some combination
 | **String** `+` **Integer** | **Double**: `"34" + 6` is 40 |
 
 > [!WARNING]
-> In twinBASIC BETA 997, an addition, subtraction, multiplication or division whose result is a declared **Single** raises no error when the result overflows: the **Single** holds infinity (`1.#INF`) instead. Declare the variable **Double** where an overflow must be caught. Code compiled with LLVM has a similar defect for **Double**; see [Language support](../LLVM/Getting-Started#language-support).
+> In twinBASIC BETA 997, an addition, subtraction, multiplication or division whose result is a declared **Single** raises no error when the result overflows: the **Single** holds infinity (`1.#INF`) instead. VB6 raises error 6, *Overflow*. Declare the variable **Double** where an overflow must be caught. Code compiled with LLVM has a similar defect for **Double**; see [Language support](../LLVM/Getting-Started#language-support).
 
 ### Variant operands
 

From 06d298ab4f8bfb269730dea2209e55cc8c255f6e Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Tue, 6 Oct 2026 01:59:53 +0200
Subject: [PATCH 39/42] Callout rule: where twinBASIC and VB6 differ, say what
 VB6 does, checked in VB6 (WIP.md rule 6 and Authoring.md)

---
 WIP.md                          | 2 ++
 docs/Documentation/Authoring.md | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/WIP.md b/WIP.md
index 2fd88a277..cc1f085c2 100644
--- a/WIP.md
+++ b/WIP.md
@@ -216,6 +216,8 @@ The vocabulary tables further down cover word choice. The rules in this subsecti
 
    One callout per concern; don't stack a NOTE and an IMPORTANT for the same point.
 
+   **Where twinBASIC and VB6 behave differently, say what VB6 does** (owner's rule, 2026-10-06), checked with `scripts/vb6run.mjs` or a reproducer's `vb6/` side, never from memory. Where twinBASIC's behaviour is the nominal one, the VB6 behaviour goes in a `> [!NOTE]`; inside a defect's WARNING it is one sentence, such as "VB6 raises error 6, *Overflow*."
+
    **A known twinBASIC defect that silently gives a wrong result is a `> [!WARNING]` until a fixed build is released** (owner's rule): a wrong value with no error raised is data corruption the reader cannot see. A crash is a WARNING too (unsaved data is lost), and so is an error that hides a silent part (a procedure run twice before the error). A defect the reader cannot miss and that loses nothing --- an error raised, a statement refused --- is a `> [!NOTE]`. Name the build in either. **Once a fixed build is released, the callout goes** (owner's rule, 2026-10-05): the documentation is not a record of past defects, so the page then states the correct behaviour with no mention of the defect. The defect's BUGS-TO-REPORT entry says in its HTML comment which page carries the callout, so the callout is removed when the entry is retired.
 
 7. **See Also.** Last section on the page, after `Example`. Format: `- [Symbol](Symbol) <noun>` where `<noun>` is the kind: statement, function, property, method, class, module, package. Pages with annotations use `- [Symbol](Symbol) -- short description` — the `--` source renders as a typographic dash via markdown-it's typographer (en-dash for `--`, em-dash for `---`). Don't write literal `—` in source; keep `--` for consistency across the docs. Order by conceptual proximity, not strict alphabetical.
diff --git a/docs/Documentation/Authoring.md b/docs/Documentation/Authoring.md
index 6b707602f..d4c266eed 100644
--- a/docs/Documentation/Authoring.md
+++ b/docs/Documentation/Authoring.md
@@ -924,6 +924,8 @@ Three severities, used distinctly:
 
 A known defect in twinBASIC follows the same scale. A defect that silently gives a wrong result --- a function that returns the wrong value and raises no error --- is a `> [!WARNING]` until a fixed build is released, because nothing tells the reader that their data is wrong. A defect that crashes the program is a `> [!WARNING]` too, because whatever it had not saved is lost. So is a defect whose error hides a silent part, such as a procedure that runs twice before the error is raised. A defect the reader cannot miss and that loses nothing, such as an error raised or a statement the compiler refuses, is a `> [!NOTE]`. Either callout names the build it applies to. Once a fixed build is out, the callout is removed, and the page describes the correct behaviour with no mention of the defect: the documentation is not a record of past defects.
 
+Where twinBASIC and VB6 behave differently, say what VB6 does. Check it in VB6 --- [`vb6run.mjs`](Tools#vb6run) builds and runs a sample there --- rather than writing it from memory. Where twinBASIC's behaviour is the intended one, the VB6 behaviour goes in a `> [!NOTE]`. Inside a defect's `> [!WARNING]` it is one sentence, such as "VB6 raises error 6, *Overflow*."
+
 Use one callout per concern, and reserve them for genuine notes --- plain "why this is useful" prose should stay a plain paragraph.
 
 ## Document the product as it is

From 305166210d42e130a060e392bfd1efc60a5c2df1 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Tue, 6 Oct 2026 12:31:16 +0200
Subject: [PATCH 40/42] BETA 997: ShiftRotateLeft, ShiftRotateRight,
 ShiftUnsignedRight, ByteSwap, Compilation.UnrollLoop and array constants
 documented; package-api.json and the symbol index on 997

---
 add-in/Resources/SYMBOLS/symbols.json         |  7 ++-
 builder/package-api.json                      | 14 ++++--
 builder/page-baseline.json                    |  2 +-
 builder/symbol-baseline.json                  |  5 ++
 docs/LLVM/Getting-Started.md                  | 14 ++++++
 docs/Reference/Categories.md                  |  4 ++
 docs/Reference/Core/Const.md                  | 30 ++++++++++++
 docs/Reference/Core/LeftShift.md              |  1 +
 docs/Reference/Core/RightShift.md             |  2 +
 .../Default/VBA/Compilation/UnrollLoop.md     | 40 ++++++++++++++++
 .../Default/VBA/Compilation/index.md          |  5 ++
 docs/Reference/Default/VBA/Math/ByteSwap.md   | 40 ++++++++++++++++
 .../Default/VBA/Math/ShiftRotateLeft.md       | 47 +++++++++++++++++++
 .../Default/VBA/Math/ShiftRotateRight.md      | 44 +++++++++++++++++
 .../Default/VBA/Math/ShiftUnsignedRight.md    | 44 +++++++++++++++++
 docs/Reference/Default/VBA/Math/index.md      | 14 ++++++
 docs/Reference/Procedures and Functions.md    |  5 ++
 17 files changed, 312 insertions(+), 6 deletions(-)
 create mode 100644 docs/Reference/Default/VBA/Compilation/UnrollLoop.md
 create mode 100644 docs/Reference/Default/VBA/Math/ByteSwap.md
 create mode 100644 docs/Reference/Default/VBA/Math/ShiftRotateLeft.md
 create mode 100644 docs/Reference/Default/VBA/Math/ShiftRotateRight.md
 create mode 100644 docs/Reference/Default/VBA/Math/ShiftUnsignedRight.md

diff --git a/add-in/Resources/SYMBOLS/symbols.json b/add-in/Resources/SYMBOLS/symbols.json
index f8904872f..69e6f3bf1 100644
--- a/add-in/Resources/SYMBOLS/symbols.json
+++ b/add-in/Resources/SYMBOLS/symbols.json
@@ -1,6 +1,6 @@
 {
   "format": 1,
-  "api": 995,
+  "api": 997,
   "packages": {"VBA":"VBA","VBRUN":"VBRUN","VB":"VB","AppGlobalClassProject":"AppGlobalClassObject","cefPackage":"CEF","CustomControls":"CustomControls","CustomControlsPackage":"CustomControls","Assert":"Assert","WebView2Package":"WebView2","WinEventLogLib":"WinEventLogLib","WinNamedPipesLib":"WinNamedPipesLib","WinNativeCommonCtls":"WinNativeCommonCtls","WinServicesLib":"WinServicesLib","tbIDE":"tbIDE"},
   "interfaces": {"VBA._Collection":"VBA.Collection","VBA._ErrObject":"VBA.ErrObject","VBA.ITbExpressionService":"VBA.TbExpressionService","VBRUN._PropertyBag":"VBRUN.PropertyBag","VB._App":"VB.App","VB._Clipboard":"VB.Clipboard","VB._Screen":"VB.Screen","VB.VBGlobal":"VB.Global","AppGlobalClassProject._App":"AppGlobalClassProject.App","CustomControls._CustomControlTimer":"CustomControls.CustomControlTimer","CustomControls._CustomControlContext":"CustomControls.CustomControlContext","CustomControls._CustomFormContext":"CustomControls.CustomFormContext","CustomControls._CustomControlsCollection":"CustomControls.CustomControlsCollection","tbIDE.IAddInV1":"tbIDE.AddIn","tbIDE.IButtonV1":"tbIDE.Button","tbIDE.ICodeEditorV1":"tbIDE.CodeEditor","tbIDE.IDebugConsoleV1":"tbIDE.DebugConsole","tbIDE.IEditorV1":"tbIDE.Editor","tbIDE.IEditorsV1":"tbIDE.Editors","tbIDE.IFileV2":"tbIDE.File","tbIDE.IFileSystemV1":"tbIDE.FileSystem","tbIDE.IFileSystemItemV1":"tbIDE.FileSystemItem","tbIDE.IFolderV1":"tbIDE.Folder","tbIDE.IHostV1":"tbIDE.Host","tbIDE.IHtmlElementV1":"tbIDE.HtmlElement","tbIDE.IHtmlElementPropertiesV1":"tbIDE.HtmlElementProperties","tbIDE.IHtmlElementPropertyV1":"tbIDE.HtmlElementProperty","tbIDE.IHtmlElementsV1":"tbIDE.HtmlElements","tbIDE.IHtmlEventPropertiesV1":"tbIDE.HtmlEventProperties","tbIDE.IHtmlEventPropertyV1":"tbIDE.HtmlEventProperty","tbIDE.IKeyboardShortcutsV1":"tbIDE.KeyboardShortcuts","tbIDE.IProjectV1":"tbIDE.Project","tbIDE.IThemesV1":"tbIDE.Themes","tbIDE.IToolWindowV1":"tbIDE.ToolWindow","tbIDE.IToolWindowsV1":"tbIDE.ToolWindows","tbIDE.IToolbarV1":"tbIDE.Toolbar","tbIDE.IToolbarsV1":"tbIDE.Toolbars"},
   "symbols": [
@@ -238,6 +238,7 @@
     {"name":"CurrentProjectName","package":"VBA","container":"Compilation","kind":"function","url":"/tB/Modules/Compilation/CurrentProjectName"},
     {"name":"CurrentSourceFile","package":"VBA","container":"Compilation","kind":"function","url":"/tB/Modules/Compilation/CurrentSourceFile"},
     {"name":"ProcessorArchitecture","package":"VBA","container":"Compilation","kind":"function","url":"/tB/Modules/Compilation/ProcessorArchitecture"},
+    {"name":"UnrollLoop","package":"VBA","container":"Compilation","kind":"sub","url":"/tB/Modules/Compilation/UnrollLoop"},
     {"name":"Constants","package":"VBA","container":null,"kind":"module","url":"/tB/Modules/Constants/"},
     {"name":"vbBack","package":"VBA","container":"Constants","kind":"constant","url":"/tB/Modules/Constants/"},
     {"name":"vbCr","package":"VBA","container":"Constants","kind":"constant","url":"/tB/Modules/Constants/"},
@@ -609,6 +610,7 @@
     {"name":"Math","package":"VBA","container":null,"kind":"module","url":"/tB/Modules/Math/"},
     {"name":"Abs","package":"VBA","container":"Math","kind":"function","url":"/tB/Modules/Math/Abs"},
     {"name":"Atn","package":"VBA","container":"Math","kind":"function","url":"/tB/Modules/Math/Atn"},
+    {"name":"ByteSwap","package":"VBA","container":"Math","kind":"sub","url":"/tB/Modules/Math/ByteSwap"},
     {"name":"Cos","package":"VBA","container":"Math","kind":"function","url":"/tB/Modules/Math/Cos"},
     {"name":"Exp","package":"VBA","container":"Math","kind":"function","url":"/tB/Modules/Math/Exp"},
     {"name":"Log","package":"VBA","container":"Math","kind":"function","url":"/tB/Modules/Math/Log"},
@@ -616,6 +618,9 @@
     {"name":"Rnd","package":"VBA","container":"Math","kind":"function","url":"/tB/Modules/Math/Rnd"},
     {"name":"Round","package":"VBA","container":"Math","kind":"function","url":"/tB/Modules/Math/Round"},
     {"name":"Sgn","package":"VBA","container":"Math","kind":"function","url":"/tB/Modules/Math/Sgn"},
+    {"name":"ShiftRotateLeft","package":"VBA","container":"Math","kind":"sub","url":"/tB/Modules/Math/ShiftRotateLeft"},
+    {"name":"ShiftRotateRight","package":"VBA","container":"Math","kind":"sub","url":"/tB/Modules/Math/ShiftRotateRight"},
+    {"name":"ShiftUnsignedRight","package":"VBA","container":"Math","kind":"sub","url":"/tB/Modules/Math/ShiftUnsignedRight"},
     {"name":"Sin","package":"VBA","container":"Math","kind":"function","url":"/tB/Modules/Math/Sin"},
     {"name":"Sqr","package":"VBA","container":"Math","kind":"function","url":"/tB/Modules/Math/Sqr"},
     {"name":"Tan","package":"VBA","container":"Math","kind":"function","url":"/tB/Modules/Math/Tan"},
diff --git a/builder/package-api.json b/builder/package-api.json
index 05e9538ee..af09bd18f 100644
--- a/builder/package-api.json
+++ b/builder/package-api.json
@@ -1,5 +1,5 @@
 {
-  "build": 995,
+  "build": 997,
   "packages": {
     "AppGlobalClassProject": {
       "exports": ["AppGlobalClassObject"],
@@ -594,7 +594,7 @@
       "types": [
         {"name":"_Collection","kind":"interface","members":{"Item":"function","Add":"sub","Count":"property","Remove":"sub","_NewEnum":"function","Clear":"sub","Exists":"function","KeyCountHint":"property","KeyCompareMode":"property","Items":"function","Keys":"function"},"hiddenMembers":["_NewEnum"]},
         {"name":"Collection","kind":"coclass","default":"_Collection"},
-        {"name":"Compilation","kind":"module","members":{"CurrentProjectName":"function","CurrentComponentName":"function","CurrentComponentCLSID":"function","CurrentProcedureName":"function","CurrentSourceFile":"function","ProcessorArchitecture":"function","CompilerVersion":"function"}},
+        {"name":"Compilation","kind":"module","members":{"CurrentProjectName":"function","CurrentComponentName":"function","CurrentComponentCLSID":"function","CurrentProcedureName":"function","CurrentSourceFile":"function","ProcessorArchitecture":"function","CompilerVersion":"function","UnrollLoop":"sub"}},
         {"name":"Constants","kind":"module","members":{"vbNewLine":"const","vbCrLf":"const","vbCr":"const","vbLf":"const","vbBack":"const","vbFormFeed":"const","vbTab":"const","vbVerticalTab":"const","vbNullChar":"const","vbNullString":"const","vbObjectError":"const","vbNullPtr":"const"}},
         {"name":"VbAppWinStyle","kind":"enum","in":"Constants","values":["vbHide","vbNormalFocus","vbMinimizedFocus","vbMaximizedFocus","vbNormalNoFocus","vbMinimizedNoFocus"]},
         {"name":"VbCalendar","kind":"enum","in":"Constants","values":["vbCalGreg","vbCalHijri"]},
@@ -624,7 +624,7 @@
         {"name":"Financial","kind":"module","members":{"DDB":"function","FV":"function","Pmt":"function","IPmt":"function","PPmt":"function","SYD":"function","SLN":"function","PV":"function","IRR":"function","Rate":"function","NPV":"function","MIRR":"function","NPer":"function"}},
         {"name":"Information","kind":"module","members":{"Erl":"function","IMEStatus":"function","IsMissing":"function","IsDate":"function","IsNumeric":"function","IsError":"function","IsArray":"function","IsArrayInitialized":"function","IsEmpty":"function","IsNull":"function","IsObject":"function","VarType":"function","TypeName":"function","TranslateColor":"function","RGB":"function","RGBA":"function","RGB_R":"function","RGB_G":"function","RGB_B":"function","RGBA_A":"function","QBColor":"function","LBound":"function","UBound":"function","Err":"property"}},
         {"name":"Interaction","kind":"module","members":{"MsgBox":"function","InputBox":"function","IIf":"function","DoEvents":"function","Command$":"function","Command":"function","Choose":"function","GetObject":"function","CallByName":"function","CallByDispId":"function","RaiseEventByName":"function","RaiseEventByName2":"function","RaiseEventByNameAndIID":"function","RaiseEventByNameAndIID2":"function","GetSetting":"function","DeleteSetting":"sub","SaveSetting":"sub","GetAllSettings":"function","Beep":"sub","SendKeys":"sub","Environ$":"function","Environ":"function","Switch":"function","Partition":"function","MacScript":"function","Shell":"function","AppActivate":"sub","CreateObject":"function","If":"function"}},
-        {"name":"Math","kind":"module","members":{"Atn":"function","Cos":"function","Sin":"function","Sqr":"function","Tan":"function","Exp":"function","Log":"function","Sgn":"function","Abs":"function","Round":"function","Rnd":"function","Randomize":"sub"}},
+        {"name":"Math","kind":"module","members":{"Atn":"function","Cos":"function","Sin":"function","Sqr":"function","Tan":"function","Exp":"function","Log":"function","Sgn":"function","Abs":"function","Round":"function","Rnd":"function","Randomize":"sub","ShiftRotateLeft":"sub","ShiftRotateRight":"sub","ShiftUnsignedRight":"sub","ByteSwap":"sub"}},
         {"name":"Strings","kind":"module","members":{"Asc":"function","AscW":"function","AscB":"function","Chr$":"function","Chr":"function","ChrW$":"function","ChrW":"function","ChrB$":"function","ChrB":"function","Mid$":"function","Mid":"function","MidB$":"function","MidB":"function","Left$":"function","Left":"function","LeftB$":"function","LeftB":"function","Right$":"function","Right":"function","RightB$":"function","RightB":"function","Space$":"function","Space":"function","String$":"function","String":"function","LTrim$":"function","LTrim":"function","RTrim$":"function","RTrim":"function","Trim$":"function","Trim":"function","MonthName":"function","WeekdayName":"function","StrReverse":"function","LCase$":"function","LCase":"function","UCase$":"function","UCase":"function","Format$":"function","Format":"function","FormatCurrency":"function","FormatNumber":"function","FormatPercent":"function","FormatDateTime":"function","StrComp":"function","StrConv":"function","Join":"function","Replace":"function","InStr$":"function","InStr":"function","InStrB":"function","InStrRev":"function","Filter":"function","Split":"function","Len$":"function","Len":"function","LenB$":"function","LenB":"function"}},
         {"name":"TextEncodingConstants","kind":"module","members":{"default_system_ansi":"const","utf_7":"const","utf_7_bom":"const","utf_8":"const","utf_8_bom":"const","utf_16":"const","utf_16_bom":"const","us_ascii":"const","koi8_u":"const","koi8_r":"const","big5":"const","iso_8859_1_latin1":"const","iso_8859_2_latin2":"const","iso_8859_3_latin3":"const","iso_8859_4_latin4":"const","iso_8859_5_cyrillic":"const","iso_8859_6_arabic":"const","iso_8859_7_greek":"const","iso_8859_8_hebrew":"const","iso_8859_9_latin5_turkish":"const","iso_8859_10_latin6_nordic":"const","iso_8859_11_thai":"const","iso_8859_13_latin8_baltic":"const","iso_8859_14_latin8_celtic":"const","iso_8859_15_latin9_euro":"const","iso_8859_16_latin10_balkan":"const","windows_1250_central_europe":"const","windows_1251_cyrillic":"const","windows_1252_western":"const","windows_1253_greek":"const","windows_1254_turkish":"const","windows_1255_hebrew":"const","windows_1256_arabic":"const","windows_1257_baltic":"const","windows_1258_vietnamese":"const","ibm_850_western_europe":"const","ibm_852_central_and_eastern_europe":"const","ibm_855_cyrillic":"const","ibm_856_hebrew":"const","ibm_857_turkish":"const","ibm_858_western_europe":"const","ibm_860_portuguese":"const","ibm_861_icelandic":"const","ibm_862_hebrew":"const","ibm_863_canadian":"const","ibm_865_danish":"const","ibm_866_cyrillic":"const","ibm_869_greek":"const","ibm_932_japanese":"const","ibm_949_korean":"const"},"hiddenMembers":["default_system_ansi","utf_7","utf_7_bom","utf_8","utf_8_bom","utf_16","utf_16_bom","us_ascii","koi8_u","koi8_r","big5","iso_8859_1_latin1","iso_8859_2_latin2","iso_8859_3_latin3","iso_8859_4_latin4","iso_8859_5_cyrillic","iso_8859_6_arabic","iso_8859_7_greek","iso_8859_8_hebrew","iso_8859_9_latin5_turkish","iso_8859_10_latin6_nordic","iso_8859_11_thai","iso_8859_13_latin8_baltic","iso_8859_14_latin8_celtic","iso_8859_15_latin9_euro","iso_8859_16_latin10_balkan","windows_1250_central_europe","windows_1251_cyrillic","windows_1252_western","windows_1253_greek","windows_1254_turkish","windows_1255_hebrew","windows_1256_arabic","windows_1257_baltic","windows_1258_vietnamese","ibm_850_western_europe","ibm_852_central_and_eastern_europe","ibm_855_cyrillic","ibm_856_hebrew","ibm_857_turkish","ibm_858_western_europe","ibm_860_portuguese","ibm_861_icelandic","ibm_862_hebrew","ibm_863_canadian","ibm_865_danish","ibm_866_cyrillic","ibm_869_greek","ibm_932_japanese","ibm_949_korean"]},
         {"name":"TestGeneric","kind":"class","members":{"Something":"sub"}},
@@ -856,11 +856,17 @@
         {"name":"WebView2ExecuteScriptCompleteHandler","kind":"class","public":false},
         {"name":"WebView2ExecuteScriptCompleteHandler2","kind":"class","public":false},
         {"name":"WebView2Header","kind":"class","members":{"Name":"field","Value":"field","New":"sub"}},
-        {"name":"WebView2HeadersCollection","kind":"class","members":{"New":"sub"}},
+        {"name":"tbIEnumVARIANT","kind":"interface","public":false},
+        {"name":"CArrayOfVariants","kind":"type","in":"tbIEnumVARIANT","public":false},
+        {"name":"WebView2HeadersCollection","kind":"class"},
         {"name":"WebView2Request","kind":"class","members":{"New":"sub","Method":"property","Uri":"property","Headers":"property","ContentBytes":"property","ContentUTF8":"property"}},
         {"name":"WebView2RequestHeaders","kind":"class","members":{"New":"sub","GetHeader":"function","Contains":"function","AppendHeader":"sub","RemoveHeader":"sub","GetHeaders":"function","_NewEnum":"function"}},
+        {"name":"WebView2HeadersCollection_RequestGetHeaders","kind":"class","inherits":["WebView2Package.WebView2HeadersCollection"],"members":{"New":"sub"}},
+        {"name":"WebView2HeadersCollection_RequestEnumerator","kind":"class","inherits":["WebView2Package.WebView2HeadersCollection"],"members":{"New":"sub"}},
         {"name":"WebView2Response","kind":"class","members":{"HasBeenSet":"field","New":"sub","ContentBytes":"property","ContentUTF8":"property","StatusCode":"property","ReasonPhrase":"property","Headers":"property"}},
         {"name":"WebView2ResponseHeaders","kind":"class","members":{"New":"sub","AppendHeader":"sub","Contains":"function","GetHeader":"function","GetHeaders":"function","_NewEnum":"function"}},
+        {"name":"WebView2HeadersCollection_ResponseGetHeaders","kind":"class","inherits":["WebView2Package.WebView2HeadersCollection"],"members":{"New":"sub"}},
+        {"name":"WebView2HeadersCollection_ResponseEnumerator","kind":"class","inherits":["WebView2Package.WebView2HeadersCollection"],"members":{"New":"sub"}},
         {"name":"WebViewEnums","kind":"module"},
         {"name":"wv2PermissionKind","kind":"enum","in":"WebViewEnums","values":["wv2UnknownPermission","wv2Microphone","wv2Camera","wv2Geolocation","wv2Notifications","wv2Sensors","wv2ClipboardRead"]},
         {"name":"wv2PermissionState","kind":"enum","in":"WebViewEnums","values":["wv2StateDefault","wv2StateAllow","wv2StateDeny"]},
diff --git a/builder/page-baseline.json b/builder/page-baseline.json
index 73b27bf71..06237f3db 100644
--- a/builder/page-baseline.json
+++ b/builder/page-baseline.json
@@ -1,5 +1,5 @@
 {
   "src": "docs",
-  "pages": 922,
+  "pages": 927,
   "staticFiles": 250
 }
diff --git a/builder/symbol-baseline.json b/builder/symbol-baseline.json
index 7683bde5f..5cb0db53a 100644
--- a/builder/symbol-baseline.json
+++ b/builder/symbol-baseline.json
@@ -186,6 +186,7 @@
     "/tB/Modules/Compilation/CurrentProjectName",
     "/tB/Modules/Compilation/CurrentSourceFile",
     "/tB/Modules/Compilation/ProcessorArchitecture",
+    "/tB/Modules/Compilation/UnrollLoop",
     "/tB/Modules/Constants/",
     "/tB/Modules/Constants/VbAppWinStyle",
     "/tB/Modules/Constants/VbArchitecture",
@@ -409,6 +410,7 @@
     "/tB/Modules/Math/",
     "/tB/Modules/Math/Abs",
     "/tB/Modules/Math/Atn",
+    "/tB/Modules/Math/ByteSwap",
     "/tB/Modules/Math/Cos",
     "/tB/Modules/Math/Exp",
     "/tB/Modules/Math/Log",
@@ -416,6 +418,9 @@
     "/tB/Modules/Math/Rnd",
     "/tB/Modules/Math/Round",
     "/tB/Modules/Math/Sgn",
+    "/tB/Modules/Math/ShiftRotateLeft",
+    "/tB/Modules/Math/ShiftRotateRight",
+    "/tB/Modules/Math/ShiftUnsignedRight",
     "/tB/Modules/Math/Sin",
     "/tB/Modules/Math/Sqr",
     "/tB/Modules/Math/Tan",
diff --git a/docs/LLVM/Getting-Started.md b/docs/LLVM/Getting-Started.md
index d3a8f4b2a..4fc637166 100644
--- a/docs/LLVM/Getting-Started.md
+++ b/docs/LLVM/Getting-Started.md
@@ -120,6 +120,20 @@ Sub FullyOptimizeMe()
 End Sub
 ```
 
+## Unrolling a loop
+
+Inside a procedure compiled with LLVM, [**UnrollLoop**](../tB/Modules/Compilation/UnrollLoop) asks LLVM to unroll one loop: to repeat its body several times in each iteration, so the loop tests its condition and jumps back less often. It must be the first statement in the loop's body, and may give the greatest number of repeats as a literal or a constant. It does not change what the loop does.
+
+```tb check_build
+Function Total(Values() As Long) As Long
+    Dim i As Long
+    For i = LBound(Values) To UBound(Values)
+        UnrollLoop 8
+        Total += Values(i)
+    Next
+End Function
+```
+
 ## CPU feature availability
 
 For each CPU feature, the table gives the first Intel and AMD CPUs to offer it, and the year from which all new Intel and AMD CPUs shipped with it. The last column is an estimate: some rare models, such as specialized CPUs for embedded use, may still have lacked the feature.
diff --git a/docs/Reference/Categories.md b/docs/Reference/Categories.md
index d51c2a4c4..ca08d3e97 100644
--- a/docs/Reference/Categories.md
+++ b/docs/Reference/Categories.md
@@ -238,6 +238,9 @@ Procedures:
 * [Abs](../tB/Modules/Math/Abs) - returns the absolute value of a number
 * [Round](../tB/Modules/Math/Round) - round the number to a given number of decimal places
 * [Rnd](../tB/Modules/Math/Rnd) - generate a random number in the range [0.0, 1.0)
+* [ShiftRotateLeft](../tB/Modules/Math/ShiftRotateLeft), [ShiftRotateRight](../tB/Modules/Math/ShiftRotateRight) - rotate the bits of an integral value
+* [ShiftUnsignedRight](../tB/Modules/Math/ShiftUnsignedRight) - shift the bits of an integral value right, filling with zeros
+* [ByteSwap](../tB/Modules/Math/ByteSwap) - reverse the order of the bytes in an integral value
 * [Randomize](../tB/Modules/Math/Randomize) - seed the random number generator
 * [Partition](../tB/Modules/Interaction/Partition) - return a string label identifying which of a series of equal-width numeric ranges a value falls into (histogram-style bucketing)
 
@@ -376,6 +379,7 @@ Procedures:
 * [CurrentSourceFile](../tB/Modules/Compilation/CurrentSourceFile) - returns the full path of the current source file
 * [ProcessorArchitecture](../tB/Modules/Compilation/ProcessorArchitecture) - returns the processor architecture of the running application
 * [CompilerVersion](../tB/Modules/Compilation/CompilerVersion) - returns the twinBASIC compiler version number
+* [UnrollLoop](../tB/Modules/Compilation/UnrollLoop) - asks the LLVM compiler to unroll the loop that contains it
 * [GetDeclaredTypeProgId](../tB/Modules/HiddenModule/GetDeclaredTypeProgId), [GetDeclaredTypeClsid](../tB/Modules/HiddenModule/GetDeclaredTypeClsid), [GetDeclaredTypeIid](../tB/Modules/HiddenModule/GetDeclaredTypeIid), [GetDeclaredTypeEventIid](../tB/Modules/HiddenModule/GetDeclaredTypeEventIid) - return the COM ProgID/CLSID/IID/event IID of a declared type, resolved at compile time
 * [GetDeclaredMinEnumValue](../tB/Modules/HiddenModule/GetDeclaredMinEnumValue), [GetDeclaredMaxEnumValue](../tB/Modules/HiddenModule/GetDeclaredMaxEnumValue) - return the smallest/largest value of a declared enumeration, resolved at compile time
 
diff --git a/docs/Reference/Core/Const.md b/docs/Reference/Core/Const.md
index 0e534f70e..8868099b2 100644
--- a/docs/Reference/Core/Const.md
+++ b/docs/Reference/Core/Const.md
@@ -49,6 +49,36 @@ When the constant type is not explicitly declared by using **As** *type*, the co
 
 Constants declared in a **Sub**, **Function**, or **Property** procedure are local to that procedure. A constant declared outside a procedure is defined throughout the module in which it is declared. Constants can be used anywhere an expression is allowed.
 
+## Array constants
+
+*(twinBASIC)* A constant can also be a one-dimensional array, whose elements are given with [**Array**](../Modules/Information/Array):
+
+> [ **Public** \| **Private** ] **Const** *constname* **(** [ [ *lower* **To** ] *upper* ] **)** **As** *type* **=** **Array(** *elementlist* **)**
+
+The **As** *type* clause is required. In a module or a class, *type* is **Byte**, **Integer**, **Long**, **LongLong**, **LongPtr**, **Single**, **Double**, **Currency**, **Date**, **Boolean** or an **Enum** type; any other type is compile error **TB5001**, *unsupported datatype for global Const - only scalar types are supported*. A constant declared in a procedure may also be an array of **String**, **Decimal** or **Variant**.
+
+Each element of *elementlist* is a constant expression, converted to *type* as an assignment would convert it: in a **Long** array, `2.5` becomes 2 and `"5"` becomes 5. Without bounds, the array starts at 0 and has one element for each item in *elementlist*; [**Option Base**](Option) does not change that. With bounds, the number of items must match them. `Array()` gives an empty array, whose **UBound** is -1.
+
+The elements are read as those of any array --- `Primes(2)`, with [**LBound**](../Modules/Information/LBound) and [**UBound**](../Modules/Information/UBound) for the bounds --- but the array cannot be changed or used as a whole:
+
+- Assigning to an element is compile error **TB5050**, *bad constant array accessor*.
+- **For Each** over the array is compile error **TB5109**; loop from **LBound** to **UBound** instead.
+- The array cannot be assigned to an array variable or a **Variant**, or passed as an array argument. To copy it, copy it element by element.
+- An element cannot be used in another constant expression: `Const First As Long = Primes(0)` is compile error **TB5002**.
+
+```tb check_run
+Const Primes() As Long = Array(2, 3, 5, 7, 11)
+Dim i As Long, Total As Long
+For i = LBound(Primes) To UBound(Primes)
+    Total += Primes(i)
+Next
+Debug.Print UBound(Primes)      ' 4
+Debug.Print Total               ' 28
+```
+
+> [!NOTE]
+> Array constants are a twinBASIC extension. In VBA and VB6, `Const Primes() As Long = Array(2, 3)` is a syntax error.
+
 
 ## Example
 
diff --git a/docs/Reference/Core/LeftShift.md b/docs/Reference/Core/LeftShift.md
index d6de23a83..53031a3a6 100644
--- a/docs/Reference/Core/LeftShift.md
+++ b/docs/Reference/Core/LeftShift.md
@@ -66,6 +66,7 @@ Value = 1& << 20                ' Returns 1048576.
 ### See Also
 
 - [**\>>** operator](RightShift)
+- [ShiftRotateLeft](../Modules/Math/ShiftRotateLeft) -- rotates instead of discarding the bits shifted out
 - [**And** operator](And)
 - [**Or** operator](Or)
 - [Operators](../../Reference/Operators)
diff --git a/docs/Reference/Core/RightShift.md b/docs/Reference/Core/RightShift.md
index 5d8c01c97..8d136af4f 100644
--- a/docs/Reference/Core/RightShift.md
+++ b/docs/Reference/Core/RightShift.md
@@ -64,6 +64,8 @@ Value = Negative >> 1           ' Returns -1: the vacated bit is a copy of the s
 ### See Also
 
 - [**\<<** operator](LeftShift)
+- [ShiftUnsignedRight](../Modules/Math/ShiftUnsignedRight) -- shifts right filling with zeros, not with the sign bit
+- [ShiftRotateRight](../Modules/Math/ShiftRotateRight) -- rotates instead of discarding the bits shifted out
 - [**\\** operator](IntegerDivide)
 - [**And** operator](And)
 - [Operators](../../Reference/Operators)
diff --git a/docs/Reference/Default/VBA/Compilation/UnrollLoop.md b/docs/Reference/Default/VBA/Compilation/UnrollLoop.md
new file mode 100644
index 000000000..deb8d30e4
--- /dev/null
+++ b/docs/Reference/Default/VBA/Compilation/UnrollLoop.md
@@ -0,0 +1,40 @@
+---
+title: UnrollLoop
+parent: Compilation Module
+permalink: /tB/Modules/Compilation/UnrollLoop
+---
+# UnrollLoop
+{: .no_toc }
+
+*(twinBASIC)* Asks the LLVM compiler to unroll the loop that contains it, for speed.
+
+Syntax: **UnrollLoop** [ *maxloopunrollcount* ]
+
+*maxloopunrollcount*
+: *optional* The greatest number of times the loop body may be repeated in one unrolled iteration. It must be a literal **Integer** or **Long** value from 0 to 2,147,483,647, or the name of a constant that has such a value. A variable, an expression such as `2 + 2`, a negative number or a non-integer is compile error **TB5023**, *expected a literal Integer or Long value*.
+
+*Unrolling* a loop repeats its body several times in each iteration, so that the loop tests its condition and jumps back less often. **UnrollLoop** is a hint to the [LLVM compiler](../../../LLVM/Getting-Started): it does not change what the loop does, only how the compiled code is laid out. Code that is not compiled with LLVM ignores it.
+
+**UnrollLoop** must be the first statement in the body of a **For...Next**, **Do While...Loop**, **Do Until...Loop** or **While...Wend** loop. Comments, blank lines and **Dim** statements may come before it. Anywhere else --- before or after the loop, after another statement in the body, inside an **If** block in the body, in a **For Each...Next** loop, or in a **Do...Loop** with its condition at the end or with none --- it is compile error **TB5023**, *UnrollLoop() must appear immediately inside the start of a For/While loop*.
+
+It can be written with or without parentheses and qualified or not: `UnrollLoop 4`, `UnrollLoop(4)` and `Compilation.UnrollLoop 4` are the same.
+
+> [!NOTE]
+> **UnrollLoop** is a twinBASIC extension. VBA and VB6 have no such statement.
+
+### Example
+
+```tb check_build
+Function SumOfSquares(ByVal Count As Long) As Double
+    Dim i As Long
+    For i = 1 To Count
+        UnrollLoop 4
+        SumOfSquares = SumOfSquares + CDbl(i) * i
+    Next
+End Function
+```
+
+### See Also
+
+- [Getting Started with LLVM](../../../LLVM/Getting-Started)
+- [CompilerVersion](CompilerVersion) function
diff --git a/docs/Reference/Default/VBA/Compilation/index.md b/docs/Reference/Default/VBA/Compilation/index.md
index ddc7957a4..f0468337a 100644
--- a/docs/Reference/Default/VBA/Compilation/index.md
+++ b/docs/Reference/Default/VBA/Compilation/index.md
@@ -36,6 +36,10 @@ Public Sub Log(Message As String)
 End Sub
 ```
 
+## Compiler hints
+
+[**UnrollLoop**](UnrollLoop) is a statement rather than a value: placed as the first statement in a loop's body, it asks the [LLVM compiler](../../../LLVM/Getting-Started) to unroll that loop for speed. It does not change what the loop does, and code that is not compiled with LLVM ignores it.
+
 ## Members
 
 - [CompilerVersion](CompilerVersion) -- returns the twinBASIC compiler version number
@@ -45,3 +49,4 @@ End Sub
 - [CurrentProjectName](CurrentProjectName) -- returns the name of the current project
 - [CurrentSourceFile](CurrentSourceFile) -- returns the full path of the current source file
 - [ProcessorArchitecture](ProcessorArchitecture) -- returns the processor architecture of the running application
+- [UnrollLoop](UnrollLoop) -- asks the LLVM compiler to unroll the loop that contains it
diff --git a/docs/Reference/Default/VBA/Math/ByteSwap.md b/docs/Reference/Default/VBA/Math/ByteSwap.md
new file mode 100644
index 000000000..e0125b058
--- /dev/null
+++ b/docs/Reference/Default/VBA/Math/ByteSwap.md
@@ -0,0 +1,40 @@
+---
+title: ByteSwap
+parent: Math Module
+permalink: /tB/Modules/Math/ByteSwap
+---
+# ByteSwap
+{: .no_toc }
+
+*(twinBASIC)* Reverses the order of the bytes in an integral value.
+
+Syntax: **ByteSwap(** *number* **)**
+
+*number*
+: *required* An expression of an integral type of two bytes or more: **Integer**, **Long**, **LongLong**, **LongPtr**, **Currency** or **Boolean**. A **Byte** is compile error **TB5023**, *argument must be of a size >= 2 bytes*, and any other type, a **Variant** included, is **TB5023**, *argument must be a simple integral type*.
+
+The result has the type of *number*, with its first byte last and its last byte first: **ByteSwap** of the **Long** `&H12345678` is `&H78563412`. It converts a value between little-endian order, which Windows uses, and big-endian order, which many file formats and network protocols use. Applying it twice gives the original value.
+
+A **Currency** is swapped as the 64-bit integer that stores it, which is its value multiplied by 10,000. A **LongPtr** has 4 or 8 bytes, as the build is 32-bit or 64-bit.
+
+With a constant argument, the call is evaluated when the code is compiled, so it can be used in a [**Const**](../../Core/Const) declaration, an **Enum** member's value or a **Case** expression.
+
+> [!NOTE]
+> **ByteSwap** is a twinBASIC extension. VBA and VB6 have no function of this name: a call to it is the compile error *Sub or Function not defined*.
+
+### Example
+
+```tb check_run
+Dim Small As Integer = &H1234
+Debug.Print Hex(ByteSwap(Small))                ' 3412
+
+Dim Value As Long = &H12345678
+Debug.Print Hex(ByteSwap(Value))                ' 78563412
+Debug.Print Hex(ByteSwap(ByteSwap(Value)))      ' 12345678
+```
+
+### See Also
+
+- [ShiftRotateLeft](ShiftRotateLeft) function
+- [ShiftRotateRight](ShiftRotateRight) function
+- [ShiftUnsignedRight](ShiftUnsignedRight) function
diff --git a/docs/Reference/Default/VBA/Math/ShiftRotateLeft.md b/docs/Reference/Default/VBA/Math/ShiftRotateLeft.md
new file mode 100644
index 000000000..eed1a0a96
--- /dev/null
+++ b/docs/Reference/Default/VBA/Math/ShiftRotateLeft.md
@@ -0,0 +1,47 @@
+---
+title: ShiftRotateLeft
+parent: Math Module
+permalink: /tB/Modules/Math/ShiftRotateLeft
+---
+# ShiftRotateLeft
+{: .no_toc }
+
+*(twinBASIC)* Rotates the bits of an integral value left by a given number of positions. The bits shifted out at the high end come back in at the low end.
+
+Syntax: **ShiftRotateLeft(** *number*, *shiftamount* **)**
+
+*number*
+: *required* An expression of an integral type: **Byte**, **Integer**, **Long**, **LongLong**, **LongPtr**, **Currency** or **Boolean**. Any other type, a **Variant** included, is compile error **TB5023**, *first argument must be a simple integral type*.
+
+*shiftamount*
+: *required* A numeric expression giving the number of bit positions to rotate. It is converted to a **Long**.
+
+The result has the type of *number*. The rotation works on all the bits of that type: 8 for a **Byte**, 16 for an **Integer** or a **Boolean**, 32 for a **Long**, 64 for a **LongLong** or a **Currency**, and 32 or 64 for a **LongPtr**, as the build is 32-bit or 64-bit. A **Currency** is rotated as the 64-bit integer that stores it, which is its value multiplied by 10,000.
+
+The rotation count is taken modulo the number of bits, so rotating a **Long** by 32 gives the value unchanged, and by 33 the same as by 1. A negative *shiftamount* rotates right: rotating a **Long** left by -1 is the same as rotating it left by 31. No value of *shiftamount* raises an error.
+
+Unlike the [**\<<**](../../Core/LeftShift) operator, which discards the bits shifted out and fills with zeros, **ShiftRotateLeft** loses no bits: `&H12345678 << 4` is `&H23456780`, and `ShiftRotateLeft(&H12345678, 4)` is `&H23456781`.
+
+With constant arguments, the call is evaluated when the code is compiled, so it can be used in a [**Const**](../../Core/Const) declaration, an **Enum** member's value or a **Case** expression.
+
+> [!NOTE]
+> **ShiftRotateLeft** is a twinBASIC extension. VBA and VB6 have no function of this name: a call to it is the compile error *Sub or Function not defined*.
+
+### Example
+
+```tb check_run
+Dim Value As Long = &H12345678
+Debug.Print Hex(ShiftRotateLeft(Value, 4))      ' 23456781
+Debug.Print Hex(ShiftRotateLeft(Value, 36))     ' 23456781
+Debug.Print Hex(Value << 4)                     ' 23456780
+
+Dim Flags As Byte = &H81
+Debug.Print Hex(ShiftRotateLeft(Flags, 1))      ' 3
+```
+
+### See Also
+
+- [ShiftRotateRight](ShiftRotateRight) function
+- [ShiftUnsignedRight](ShiftUnsignedRight) function
+- [ByteSwap](ByteSwap) function
+- [**\<<** operator](../../Core/LeftShift)
diff --git a/docs/Reference/Default/VBA/Math/ShiftRotateRight.md b/docs/Reference/Default/VBA/Math/ShiftRotateRight.md
new file mode 100644
index 000000000..81c6d5b59
--- /dev/null
+++ b/docs/Reference/Default/VBA/Math/ShiftRotateRight.md
@@ -0,0 +1,44 @@
+---
+title: ShiftRotateRight
+parent: Math Module
+permalink: /tB/Modules/Math/ShiftRotateRight
+---
+# ShiftRotateRight
+{: .no_toc }
+
+*(twinBASIC)* Rotates the bits of an integral value right by a given number of positions. The bits shifted out at the low end come back in at the high end.
+
+Syntax: **ShiftRotateRight(** *number*, *shiftamount* **)**
+
+*number*
+: *required* An expression of an integral type: **Byte**, **Integer**, **Long**, **LongLong**, **LongPtr**, **Currency** or **Boolean**. Any other type, a **Variant** included, is compile error **TB5023**, *first argument must be a simple integral type*.
+
+*shiftamount*
+: *required* A numeric expression giving the number of bit positions to rotate. It is converted to a **Long**.
+
+The result has the type of *number*. The rotation works on all the bits of that type: 8 for a **Byte**, 16 for an **Integer** or a **Boolean**, 32 for a **Long**, 64 for a **LongLong** or a **Currency**, and 32 or 64 for a **LongPtr**, as the build is 32-bit or 64-bit. A **Currency** is rotated as the 64-bit integer that stores it, which is its value multiplied by 10,000.
+
+The rotation count is taken modulo the number of bits, so rotating a **Long** by 32 gives the value unchanged, and by 33 the same as by 1. A negative *shiftamount* rotates left. No value of *shiftamount* raises an error.
+
+Unlike the [**\>>**](../../Core/RightShift) operator, which discards the bits shifted out, **ShiftRotateRight** loses no bits, and it never copies the sign bit: `&H12345678 >> 4` is `&H1234567`, and `ShiftRotateRight(&H12345678, 4)` is `&H81234567`.
+
+With constant arguments, the call is evaluated when the code is compiled, so it can be used in a [**Const**](../../Core/Const) declaration, an **Enum** member's value or a **Case** expression.
+
+> [!NOTE]
+> **ShiftRotateRight** is a twinBASIC extension. VBA and VB6 have no function of this name: a call to it is the compile error *Sub or Function not defined*.
+
+### Example
+
+```tb check_run
+Dim Value As Long = &H12345678
+Debug.Print Hex(ShiftRotateRight(Value, 4))     ' 81234567
+Debug.Print Hex(ShiftRotateRight(Value, -4))    ' 23456781
+Debug.Print Hex(Value >> 4)                     ' 1234567
+```
+
+### See Also
+
+- [ShiftRotateLeft](ShiftRotateLeft) function
+- [ShiftUnsignedRight](ShiftUnsignedRight) function
+- [ByteSwap](ByteSwap) function
+- [**\>>** operator](../../Core/RightShift)
diff --git a/docs/Reference/Default/VBA/Math/ShiftUnsignedRight.md b/docs/Reference/Default/VBA/Math/ShiftUnsignedRight.md
new file mode 100644
index 000000000..48e4332fe
--- /dev/null
+++ b/docs/Reference/Default/VBA/Math/ShiftUnsignedRight.md
@@ -0,0 +1,44 @@
+---
+title: ShiftUnsignedRight
+parent: Math Module
+permalink: /tB/Modules/Math/ShiftUnsignedRight
+---
+# ShiftUnsignedRight
+{: .no_toc }
+
+*(twinBASIC)* Shifts the bits of an integral value right by a given number of positions, filling the vacated high-order bits with zeros.
+
+Syntax: **ShiftUnsignedRight(** *number*, *shiftamount* **)**
+
+*number*
+: *required* An expression of an integral type: **Byte**, **Integer**, **Long**, **LongLong**, **LongPtr**, **Currency** or **Boolean**. Any other type, a **Variant** included, is compile error **TB5023**, *first argument must be a simple integral type*.
+
+*shiftamount*
+: *required* A numeric expression giving the number of bit positions to shift. It is converted to a **Long**.
+
+The result has the type of *number*. **ShiftUnsignedRight** treats *number* as unsigned: the vacated high-order bits are always zero, so a negative value becomes a positive one. This is a *logical* shift. The [**\>>**](../../Core/RightShift) operator makes an *arithmetic* shift instead, copying the sign bit into the vacated bits, so for a negative **Integer**, **Long**, **LongLong** or **LongPtr** the two differ: a **Long** holding `&H80000001`, shifted right by 1, is `&HC0000000` with **\>>** and `&H40000000` with **ShiftUnsignedRight**. For a value that is not negative, and for a **Byte**, they give the same result.
+
+A **Currency** is shifted as the 64-bit integer that stores it, which is its value multiplied by 10,000. A **LongPtr** has 32 or 64 bits, as the build is 32-bit or 64-bit.
+
+A shift by as many bits as the type holds, or more, gives 0. A negative *shiftamount* raises no error, but gives no useful result.
+
+With constant arguments, the call is evaluated when the code is compiled, so it can be used in a [**Const**](../../Core/Const) declaration, an **Enum** member's value or a **Case** expression.
+
+> [!NOTE]
+> **ShiftUnsignedRight** is a twinBASIC extension. VBA and VB6 have no function of this name: a call to it is the compile error *Sub or Function not defined*.
+
+### Example
+
+```tb check_run
+Dim Value As Long = &H80000001
+Debug.Print Hex(ShiftUnsignedRight(Value, 1))   ' 40000000
+Debug.Print Hex(Value >> 1)                     ' C0000000
+Debug.Print ShiftUnsignedRight(Value, 32)       ' 0
+```
+
+### See Also
+
+- [ShiftRotateRight](ShiftRotateRight) function
+- [ShiftRotateLeft](ShiftRotateLeft) function
+- [ByteSwap](ByteSwap) function
+- [**\>>** operator](../../Core/RightShift)
diff --git a/docs/Reference/Default/VBA/Math/index.md b/docs/Reference/Default/VBA/Math/index.md
index bdfcc7b29..84d09bb61 100644
--- a/docs/Reference/Default/VBA/Math/index.md
+++ b/docs/Reference/Default/VBA/Math/index.md
@@ -59,10 +59,21 @@ Dim Roll As Long
 Roll = Int((6 - 1 + 1) * Rnd + 1)    ' a die roll, 1..6
 ```
 
+## Bit manipulation
+
+*(twinBASIC)* Four functions work on the bits of an integral value --- a **Byte**, **Integer**, **Long**, **LongLong**, **LongPtr**, **Currency** or **Boolean** --- and return a value of the same type. [**ShiftRotateLeft**](ShiftRotateLeft) and [**ShiftRotateRight**](ShiftRotateRight) rotate the bits, so the bits shifted out at one end come back in at the other. [**ShiftUnsignedRight**](ShiftUnsignedRight) shifts right and fills with zeros, where the [**\>>**](../../Core/RightShift) operator copies the sign bit. [**ByteSwap**](ByteSwap) reverses the order of the bytes, converting between little-endian and big-endian order. With constant arguments, each is evaluated when the code is compiled, so each can be used in a **Const** declaration.
+
+```tb check_run
+Debug.Print Hex(ShiftRotateLeft(&H12345678, 8))     ' 34567812
+Debug.Print Hex(ShiftUnsignedRight(&HFFFFFFFF, 28))  ' F
+Debug.Print Hex(ByteSwap(&H12345678))               ' 78563412
+```
+
 ## Members
 
 - [Abs](Abs) -- returns the absolute value of a number
 - [Atn](Atn) -- returns the arctangent of a number, in radians
+- [ByteSwap](ByteSwap) -- reverses the order of the bytes in an integral value
 - [Cos](Cos) -- returns the cosine of an angle
 - [Exp](Exp) -- returns *e* raised to a power
 - [Log](Log) -- returns the natural (base-*e*) logarithm of a number
@@ -70,6 +81,9 @@ Roll = Int((6 - 1 + 1) * Rnd + 1)    ' a die roll, 1..6
 - [Rnd](Rnd) -- returns a pseudo-random number in the range `[0, 1)`
 - [Round](Round) -- rounds a number to a chosen number of decimal places, using banker's rounding
 - [Sgn](Sgn) -- returns the sign of a number
+- [ShiftRotateLeft](ShiftRotateLeft) -- rotates the bits of an integral value left
+- [ShiftRotateRight](ShiftRotateRight) -- rotates the bits of an integral value right
+- [ShiftUnsignedRight](ShiftUnsignedRight) -- shifts the bits of an integral value right, filling with zeros
 - [Sin](Sin) -- returns the sine of an angle
 - [Sqr](Sqr) -- returns the square root of a number
 - [Tan](Tan) -- returns the tangent of an angle
diff --git a/docs/Reference/Procedures and Functions.md b/docs/Reference/Procedures and Functions.md
index 70222e52d..8d446a6af 100644
--- a/docs/Reference/Procedures and Functions.md	
+++ b/docs/Reference/Procedures and Functions.md	
@@ -24,6 +24,7 @@ permalink: /Reference/Procedures-and-Functions
 
 - [Calendar](../tB/Modules/DateTime/Calendar) -- returns or sets the calendar type (Gregorian or Hijri)
 - [CallByDispId](../tB/Modules/Interaction/CallByDispId) -- invokes a method or property on an object dynamically by IDispatch dispatch ID
+- [ByteSwap](../tB/Modules/Math/ByteSwap) -- reverses the order of the bytes in an integral value
 - [CallByName](../tB/Modules/Interaction/CallByName) -- invokes a method or property on an object dynamically by name
 - [CBool](../tB/Modules/Conversion/CBool) -- coerces an expression to a **Boolean**
 - [CByte](../tB/Modules/Conversion/CByte) -- coerces an expression to a **Byte**
@@ -233,6 +234,9 @@ permalink: /Reference/Procedures-and-Functions
 - [SendKeys](../tB/Modules/Interaction/SendKeys) -- sends keystrokes to the active window
 - [SetAttr](../tB/Modules/FileSystem/SetAttr) -- sets attribute information for a file
 - [Sgn](../tB/Modules/Math/Sgn) -- returns a value indicating the sign of a number
+- [ShiftRotateLeft](../tB/Modules/Math/ShiftRotateLeft) -- rotates the bits of an integral value left
+- [ShiftRotateRight](../tB/Modules/Math/ShiftRotateRight) -- rotates the bits of an integral value right
+- [ShiftUnsignedRight](../tB/Modules/Math/ShiftUnsignedRight) -- shifts the bits of an integral value right, filling with zeros
 - [Shell](../tB/Modules/Interaction/Shell) -- runs another program asynchronously and returns its task ID
 - [Sin](../tB/Modules/Math/Sin) -- returns the sine of an angle
 - [SLN](../tB/Modules/Financial/SLN) -- returns the straight-line depreciation of an asset for a single period
@@ -263,6 +267,7 @@ permalink: /Reference/Procedures-and-Functions
 
 - [UBound](../tB/Modules/Information/UBound) -- returns the largest valid subscript for a dimension of an array
 - [UCase$, UCase](../tB/Modules/Strings/UCase) -- returns a string converted to uppercase
+- [UnrollLoop](../tB/Modules/Compilation/UnrollLoop) -- asks the LLVM compiler to unroll the loop that contains it
 - [Unload](../tB/Core/Unload) -- removes an object (typically a form) from memory
 
 ## V

From 746f570ee384bb3c5e27c6a95e76ff85f60bd1db Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Tue, 6 Oct 2026 12:31:16 +0200
Subject: [PATCH 41/42] WebView2 headers collection pages state 997's
 enumerator and its four derived classes; FAQ: VBP import carries the startup
 object, icon form and the console flag

---
 docs/Miscellaneous/FAQs.md                    |  2 ++
 .../WebView2/WebView2HeadersCollection.md     | 22 +++++++++++++------
 .../WebView2/WebView2RequestHeaders.md        |  4 ++--
 .../WebView2/WebView2ResponseHeaders.md       |  4 ++--
 docs/Reference/Built-In/WebView2/index.md     |  2 +-
 5 files changed, 22 insertions(+), 12 deletions(-)

diff --git a/docs/Miscellaneous/FAQs.md b/docs/Miscellaneous/FAQs.md
index 0facbfa19..4f86491ac 100644
--- a/docs/Miscellaneous/FAQs.md
+++ b/docs/Miscellaneous/FAQs.md
@@ -248,6 +248,8 @@ You can import individual files, from VB projects or any type, through the Impor
 > You can select .bas/.cls files individually, but to import Forms, UserControls, Property Pages, and Resource Files you must currently select the .vbp file they're associated with. You'll then be shown a list of files you can import (with their new twinBASIC extensions .tbform/.twin etc-- make sure to import both, e.g. for Form1.frm you'll see Form1.frm.tbform and Form1.frm.twin:
 
 ![The Import from twinproj dialog: a tick-box tree of everything found in RunAsTI.vbp, with the Resources branch expanded over its ICON and MANIFEST folders and a Sources branch below. Form1.frm.tbform and Form1.frm.twin are both ticked.](Images/16833fae-4bd7-418f-bb16-691a611a5b01.png){:style="width:50%; height:auto;"}
+
+Importing a .vbp also carries over its [startup object](tB/IDE/Project/Settings#startup-object) and its [icon form](tB/IDE/Project/Settings#icon-form). A VB6 project that was linked as a console program --- its `LinkSwitches` line contains `/SUBSYSTEM:CONSOLE`, written in capitals --- becomes a [console application](tB/IDE/Project/Settings#is-console-application). No other linker switch is carried over.
 </details>
 
 <details>
diff --git a/docs/Reference/Built-In/WebView2/WebView2HeadersCollection.md b/docs/Reference/Built-In/WebView2/WebView2HeadersCollection.md
index 861ec2bdd..dd7635fb1 100644
--- a/docs/Reference/Built-In/WebView2/WebView2HeadersCollection.md
+++ b/docs/Reference/Built-In/WebView2/WebView2HeadersCollection.md
@@ -10,7 +10,9 @@ has_toc: false
 
 An enumerator that yields [**WebView2Header**](WebView2Header) values one by one. Returned by **WebView2RequestHeaders.GetHeaders**, **WebView2ResponseHeaders.GetHeaders**, and by `For Each` over a [**WebView2RequestHeaders**](WebView2RequestHeaders) or [**WebView2ResponseHeaders**](WebView2ResponseHeaders) instance.
 
-The collection is forward-only: once iterated it is exhausted. It does not implement **Reset**, **Skip**, or **Clone**, and calling those raises run-time error 80004001 (*Not implemented*).
+The collection implements the COM enumerator operations **Next**, **Skip**, **Reset** and **Clone**, which `For Each` and other COM enumerator clients call. They are not members that BASIC code can call. A loop reads the headers once, front to back; **Reset** starts the enumeration again from the first header. Every call to **GetHeaders** and every `For Each` loop produces a new enumerator, so a new loop always starts at the first header.
+
+A **WebView2HeadersCollection** is never created by application code. The package returns one of the four derived classes listed under [Derived classes](#derived-classes), typed as **WebView2HeadersCollection**.
 
 ```tb check_build
 Private Sub WebView21_NavigationStarting( _
@@ -27,14 +29,20 @@ Private Sub WebView21_NavigationStarting( _
 End Sub
 ```
 
+## Derived classes
+
+Four public classes inherit from **WebView2HeadersCollection**. Each is `[COMCreatable(False)]`, and application code does not create them: the package creates them and returns them as **WebView2HeadersCollection**. Each overrides **Reset** and **Clone** to work on its own source of headers.
+
+| Class | Returned by | Yields |
+|-------|-------------|--------|
+| **WebView2HeadersCollection_RequestGetHeaders** | [**WebView2RequestHeaders.GetHeaders**](WebView2RequestHeaders#getheaders) | the request headers whose name matches the *name* argument |
+| **WebView2HeadersCollection_RequestEnumerator** | `For Each` over a [**WebView2RequestHeaders**](WebView2RequestHeaders) | every request header |
+| **WebView2HeadersCollection_ResponseGetHeaders** | [**WebView2ResponseHeaders.GetHeaders**](WebView2ResponseHeaders#getheaders) | the response headers whose name matches the *name* argument |
+| **WebView2HeadersCollection_ResponseEnumerator** | `For Each` over a [**WebView2ResponseHeaders**](WebView2ResponseHeaders) | every response header |
+
 ## Methods
 
 ### New
 {: .no_toc }
 
-Constructs the collection. Created internally by the package; application code does not normally invoke this.
-
-Syntax: **New WebView2HeadersCollection** ( *Iterator* )
-
-*Iterator*
-: *required* An internal iterator handed in by the runtime.
+Constructs the collection from the runtime's header iterator. The constructor is **Protected**: only the four derived classes call it, and application code cannot create a **WebView2HeadersCollection**.
diff --git a/docs/Reference/Built-In/WebView2/WebView2RequestHeaders.md b/docs/Reference/Built-In/WebView2/WebView2RequestHeaders.md
index d031a1482..8021fbaf7 100644
--- a/docs/Reference/Built-In/WebView2/WebView2RequestHeaders.md
+++ b/docs/Reference/Built-In/WebView2/WebView2RequestHeaders.md
@@ -67,7 +67,7 @@ Syntax: *object*.**GetHeader** ( *name* ) **As String**
 ### GetHeaders
 {: .no_toc }
 
-Returns a [**WebView2HeadersCollection**](WebView2HeadersCollection) iterator restricted to the headers that match *name* --- useful for headers that may have multiple values.
+Returns a [**WebView2HeadersCollection**](WebView2HeadersCollection) enumerator restricted to the headers that match *name* --- useful for headers that may have multiple values. Each call returns a new enumerator that starts at the first matching header.
 
 Syntax: *object*.**GetHeaders** ( *name* ) **As WebView2HeadersCollection**
 
@@ -103,4 +103,4 @@ Private Sub WebView21_NavigationStarting( _
 End Sub
 ```
 
-The enumerator is forward-only and cannot be reset. See [**WebView2HeadersCollection**](WebView2HeadersCollection) for the iteration object.
+Each `For Each` loop starts at the first header. See [**WebView2HeadersCollection**](WebView2HeadersCollection) for the iteration object.
diff --git a/docs/Reference/Built-In/WebView2/WebView2ResponseHeaders.md b/docs/Reference/Built-In/WebView2/WebView2ResponseHeaders.md
index 4f2798164..351008906 100644
--- a/docs/Reference/Built-In/WebView2/WebView2ResponseHeaders.md
+++ b/docs/Reference/Built-In/WebView2/WebView2ResponseHeaders.md
@@ -62,7 +62,7 @@ Syntax: *object*.**GetHeader** ( *name* ) **As String**
 ### GetHeaders
 {: .no_toc }
 
-Returns a [**WebView2HeadersCollection**](WebView2HeadersCollection) iterator restricted to the headers that match *name*.
+Returns a [**WebView2HeadersCollection**](WebView2HeadersCollection) enumerator restricted to the headers that match *name*. Each call returns a new enumerator that starts at the first matching header.
 
 Syntax: *object*.**GetHeaders** ( *name* ) **As WebView2HeadersCollection**
 
@@ -85,4 +85,4 @@ Private Sub WebView21_WebResourceRequested( _
 End Sub
 ```
 
-See [**WebView2HeadersCollection**](WebView2HeadersCollection) for the iteration object.
+Each `For Each` loop starts at the first header. See [**WebView2HeadersCollection**](WebView2HeadersCollection) for the iteration object.
diff --git a/docs/Reference/Built-In/WebView2/index.md b/docs/Reference/Built-In/WebView2/index.md
index ab26fa638..a26d53f67 100644
--- a/docs/Reference/Built-In/WebView2/index.md
+++ b/docs/Reference/Built-In/WebView2/index.md
@@ -19,7 +19,7 @@ Beyond the control itself, the package exposes a small set of wrapper objects th
 - [WebView2](WebView2/) -- the control: navigation, scripting, settings, deferral-aware events, and PDF / suspend / download / task-manager features controlled by the underlying Edge runtime
 - [WebView2EnvironmentOptions](WebView2/EnvironmentOptions) -- pre-creation configuration for the WebView2 environment (user-data folder, executable folder, locale, tracking-prevention, …); reached via the control's **EnvironmentOptions** property
 - [WebView2Header](WebView2Header) -- one HTTP header (Name / Value); the element type yielded by header iteration
-- [WebView2HeadersCollection](WebView2HeadersCollection) -- enumerable wrapper used by `For Each` over request / response headers
+- [WebView2HeadersCollection](WebView2HeadersCollection) -- enumerator returned by **GetHeaders** and used by `For Each` over request / response headers; also describes its four derived classes
 - [WebView2Request](WebView2Request) -- the request side of a **WebResourceRequested** event -- **Method**, **Uri**, **Headers**, and the request body as bytes or UTF-8 text
 - [WebView2RequestHeaders](WebView2RequestHeaders) -- mutable request-header collection passed to **NavigationStarting** and reached via **WebView2Request.Headers**
 - [WebView2Response](WebView2Response) -- the response side of a **WebResourceRequested** event -- **StatusCode**, **ReasonPhrase**, **Headers**, and the body as bytes or UTF-8 text

From 4192f106fd265cf46fe960f4b51f5ccce1819a11 Mon Sep 17 00:00:00 2001
From: Kuba Sunderland-Ober <kuba@mareimbrium.org>
Date: Tue, 6 Oct 2026 12:53:35 +0200
Subject: [PATCH 42/42] Eight defects of 997's array constants, Math intrinsics
 and LLVM conversions and shifts, with reproducers; WARNINGs and NOTEs on
 Const, the three shift functions, LeftShift, RightShift and the LLVM page

---
 BUGS-TO-REPORT.md                             | 314 ++++++++++++++++++
 ...y-const-after-procedure-not-found.twinproj | Bin 0 -> 2469 bytes
 .../repro.json                                |   7 +
 .../src/Settings                              |  61 ++++
 .../src/Sources/Startup.twin                  |  15 +
 ...rray-const-element-overflow-crash.twinproj | Bin 0 -> 2313 bytes
 .../repro.json                                |   6 +
 .../src/Settings                              |  61 ++++
 .../src/Sources/Startup.twin                  |   9 +
 .../array-const-in-array-const-crash.twinproj | Bin 0 -> 2351 bytes
 .../repro.json                                |   6 +
 .../src/Settings                              |  61 ++++
 .../src/Sources/Startup.twin                  |  10 +
 ...ay-const-paramarray-codegen-error.twinproj | Bin 0 -> 2485 bytes
 .../repro.json                                |   7 +
 .../src/Settings                              |  61 ++++
 .../src/Sources/Startup.twin                  |  14 +
 ...ss-public-array-const-unreachable.twinproj | Bin 0 -> 2738 bytes
 .../repro.json                                |   7 +
 .../src/Settings                              |  61 ++++
 .../src/Sources/Startup.twin                  |  11 +
 .../src/Sources/WithArray.twin                |   9 +
 .../src/Sources/WithScalar.twin               |   5 +
 .../llvm-conversion-rounds-half-away.twinproj | Bin 0 -> 3472 bytes
 .../repro.json                                |  12 +
 .../src/Settings                              |  61 ++++
 .../src/Sources/Startup.twin                  |  31 ++
 .../vb6/Module1.bas                           |  23 ++
 .../vb6/Probe.vbp                             |   7 +
 .../llvm-shift-count-truncated.twinproj       | Bin 0 -> 3789 bytes
 bugs/llvm-shift-count-truncated/repro.json    |  14 +
 bugs/llvm-shift-count-truncated/src/Settings  |  61 ++++
 .../src/Sources/Startup.twin                  |  39 +++
 ...-intrinsics-ignore-argument-names.twinproj | Bin 0 -> 3390 bytes
 .../repro.json                                |  16 +
 .../src/Settings                              |  61 ++++
 .../src/Sources/Startup.twin                  |  21 ++
 docs/LLVM/Getting-Started.md                  |   3 +
 docs/Reference/Core/Const.md                  |  13 +
 docs/Reference/Core/LeftShift.md              |   3 +
 docs/Reference/Core/RightShift.md             |   3 +
 .../Default/VBA/Math/ShiftRotateLeft.md       |   3 +
 .../Default/VBA/Math/ShiftRotateRight.md      |   3 +
 .../Default/VBA/Math/ShiftUnsignedRight.md    |   3 +
 44 files changed, 1102 insertions(+)
 create mode 100644 bugs/array-const-after-procedure-not-found/array-const-after-procedure-not-found.twinproj
 create mode 100644 bugs/array-const-after-procedure-not-found/repro.json
 create mode 100644 bugs/array-const-after-procedure-not-found/src/Settings
 create mode 100644 bugs/array-const-after-procedure-not-found/src/Sources/Startup.twin
 create mode 100644 bugs/array-const-element-overflow-crash/array-const-element-overflow-crash.twinproj
 create mode 100644 bugs/array-const-element-overflow-crash/repro.json
 create mode 100644 bugs/array-const-element-overflow-crash/src/Settings
 create mode 100644 bugs/array-const-element-overflow-crash/src/Sources/Startup.twin
 create mode 100644 bugs/array-const-in-array-const-crash/array-const-in-array-const-crash.twinproj
 create mode 100644 bugs/array-const-in-array-const-crash/repro.json
 create mode 100644 bugs/array-const-in-array-const-crash/src/Settings
 create mode 100644 bugs/array-const-in-array-const-crash/src/Sources/Startup.twin
 create mode 100644 bugs/array-const-paramarray-codegen-error/array-const-paramarray-codegen-error.twinproj
 create mode 100644 bugs/array-const-paramarray-codegen-error/repro.json
 create mode 100644 bugs/array-const-paramarray-codegen-error/src/Settings
 create mode 100644 bugs/array-const-paramarray-codegen-error/src/Sources/Startup.twin
 create mode 100644 bugs/class-public-array-const-unreachable/class-public-array-const-unreachable.twinproj
 create mode 100644 bugs/class-public-array-const-unreachable/repro.json
 create mode 100644 bugs/class-public-array-const-unreachable/src/Settings
 create mode 100644 bugs/class-public-array-const-unreachable/src/Sources/Startup.twin
 create mode 100644 bugs/class-public-array-const-unreachable/src/Sources/WithArray.twin
 create mode 100644 bugs/class-public-array-const-unreachable/src/Sources/WithScalar.twin
 create mode 100644 bugs/llvm-conversion-rounds-half-away/llvm-conversion-rounds-half-away.twinproj
 create mode 100644 bugs/llvm-conversion-rounds-half-away/repro.json
 create mode 100644 bugs/llvm-conversion-rounds-half-away/src/Settings
 create mode 100644 bugs/llvm-conversion-rounds-half-away/src/Sources/Startup.twin
 create mode 100644 bugs/llvm-conversion-rounds-half-away/vb6/Module1.bas
 create mode 100644 bugs/llvm-conversion-rounds-half-away/vb6/Probe.vbp
 create mode 100644 bugs/llvm-shift-count-truncated/llvm-shift-count-truncated.twinproj
 create mode 100644 bugs/llvm-shift-count-truncated/repro.json
 create mode 100644 bugs/llvm-shift-count-truncated/src/Settings
 create mode 100644 bugs/llvm-shift-count-truncated/src/Sources/Startup.twin
 create mode 100644 bugs/math-intrinsics-ignore-argument-names/math-intrinsics-ignore-argument-names.twinproj
 create mode 100644 bugs/math-intrinsics-ignore-argument-names/repro.json
 create mode 100644 bugs/math-intrinsics-ignore-argument-names/src/Settings
 create mode 100644 bugs/math-intrinsics-ignore-argument-names/src/Sources/Startup.twin

diff --git a/BUGS-TO-REPORT.md b/BUGS-TO-REPORT.md
index 417fefb8f..f30e3634f 100644
--- a/BUGS-TO-REPORT.md
+++ b/BUGS-TO-REPORT.md
@@ -1985,4 +1985,318 @@ Severity: a silent wrong result. A `Single` overflow that ends the program or re
 
 <!-- Reproducer: bugs/single-overflow-no-error/ (mode run; expects the `+`, `-`, `*`, `/`, `+=` and `CSng` lines above); verified on BETA 997 and 995 with `bug_repro.mjs run`, and on 997 with --llvm and --arch win64. VB6: `bug_repro.mjs vb6 single-overflow-no-error` (VB6 has no `+=`, so the file has `s = s + x`). The constant cases come from tbbuild on one-constant projects, and VB6's from `vb6run.mjs` on `Const` statements; neither is in the reproducer. Pages with wrong sentences: docs/Reference/Core/Divide.md line 31 ("A declared **Single** that overflows raises error 6"), and the sentence "A declared (non-**Variant**) result that overflows raises error 6" in Plus.md, Minus.md and Multiply.md, and docs/Reference/Operators.md line 135 ("A result that does not fit its type raises error 6"); each of Divide.md, Plus.md, Minus.md, Multiply.md and Operators.md (after its porting table) carries a `> [!WARNING]` naming BETA 997 (a silent wrong result, owner's rule); remove them once a fixed build is released. The variant rows (Plus.md line 54, Minus.md line 34, Multiply.md line 32, Divide.md line 31's second clause) and the result-type rows for Single and Long are right. Exponent.md says nothing about overflow. Related: llvm-double-overflow-no-error (the `Double` overflow under LLVM). -->
 
+---
+
+## A module-level array `Const` with an element that does not fit its type crashes the compiler
+
+**Describe the bug**
+An array `Const` at module level whose element is too large for the element type takes the compiler down: `Const Big() As Long = Array(2147483648)`. The IDE's compile restarts the compiler, which crashes again, and the project can neither be compiled nor run. The crash happens whether or not the constant is used. Observed with `tbbuild`, which reports "the compiler crashed 3x".
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `array-const-element-overflow-crash.twinproj` (attached as `array-const-element-overflow-crash.zip`). Its one module is:
+   ```
+   Module Startup
+       Const Big() As Long = Array(2147483648)
+       Public Sub Main()
+       End Sub
+   End Module
+   ```
+2. Compile it. The compiler crashes.
+
+**Expected behavior**
+A compile error, as for a scalar constant: `Const K As Long = 2147483648` is refused with TB5002, and `Const Small() As Integer = Array(32768)` with TB5001.
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 997
+
+**Additional context**
+BETA 995 has no array constants: every array `Const` is refused there with TB5245, *array cannot be initialized here*. VB6 has no array constants either (`Const A() As Long = Array(1)` is a syntax error), so there is no VB6 project.
+
+What crashes, each in a module of its own, unused or used: `Array(2147483648)`, `Array(2147483648#)`, `Array(3000000000.5)` and `Array(1, 2147483648)` for `Long`; `Array(40000.5)` for `Integer`; `Array(300.5)` and `Array(-1.5)` for `Byte`; `Array(9223372036854775808#)` for `LongLong`. What does not: the same constant declared inside a procedure compiles clean; a `Single` or `Double` array with a huge element (`Array(1E+300)`) compiles; an `Integer` or `Byte` element that is an integer literal too large (`Array(32768)`) is the ordinary TB5001.
+
+A second crash seems to belong with this one, and it is not in the reproducer. A `Single` array `Const` whose element overflows, `Const A() As Single = Array(1E+39)`, compiles alone, but crashes the compiler when a later array `Const` of `Double` calls `Sqr`, `Timer` or `Rnd`, for example `Const B() As Double = Array(Sqr(4))` on the next line. The reverse order, `Abs` or `Len` in place of those, `Now` or `Date`, and a `Single` array of `Timer` do not crash. The cause is not established; it could be an overflow flag left by the first constant, which the second one's call then trips over.
+
+Severity: a compiler crash, and the project cannot be opened for compiling until the constant is removed.
+
+<!-- Reproducer: bugs/array-const-element-overflow-crash/ (mode compile, expects tbbuild exit 4); verified on BETA 997 by `bug_repro.mjs verify`; on 995 the same project gives TB5245, as every array Const does there. The Sqr/Timer/Rnd variant was checked with `tbbuild` on BETA 997 in scratch projects (beta997-probes c24_KJ_KTm and the t_* cases) and is not in the reproducer. docs/Reference/Core/Const.md (the "Array constants" section) carries a `> [!WARNING]` for it, naming BETA 997 (a crash, owner's rule), removed once a fixed build is released. -->
+
+---
+
+## A module-level array `Const` initialised from an element of another array `Const` crashes the compiler
+
+**Describe the bug**
+At module level, an array `Const` whose `Array(...)` list names an element of another array `Const` crashes the compiler: `Const A() As Long = Array(1, 2, 3)` followed by `Const B() As Long = Array(A(0))`. The compiler crashes again each time the IDE restarts it, so the project cannot be compiled or run. Observed with `tbbuild`, which reports "the compiler crashed 3x".
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `array-const-in-array-const-crash.twinproj` (attached as `array-const-in-array-const-crash.zip`). Its one module is:
+   ```
+   Module Startup
+       Const A() As Long = Array(1, 2, 3)
+       Const B() As Long = Array(A(0))
+       Public Sub Main()
+       End Sub
+   End Module
+   ```
+2. Compile it. The compiler crashes.
+
+**Expected behavior**
+Either `B` is `Array(1)`, as it is when the two constants are declared in a procedure, or the compiler refuses the element with an error, as it does for a scalar constant (`Const S As Long = A(0)` is TB5002).
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 997
+
+**Additional context**
+BETA 995 has no array constants: every array `Const` is refused there with TB5245. VB6 has none either, so there is no VB6 project.
+
+It crashes with `B` used or unused, with `Private` constants, with `Double` arrays, with the two in the opposite order, and when an array refers to its own element (`Const B() As Long = Array(1, B(0))`).
+
+What does not crash: the same two constants inside a procedure compile clean; an array whose element is a scalar `Const` compiles; `Array(A(0) + 1)` is an ordinary TB5001, *Type mismatch*.
+
+Severity: a compiler crash, and the project cannot be compiled until the constant is removed.
+
+<!-- Reproducer: bugs/array-const-in-array-const-crash/ (mode compile, expects tbbuild exit 4); verified on BETA 997 by `bug_repro.mjs verify`; on 995 the project gives TB5245. The variants above were checked with `tbbuild` on 997 in scratch projects. docs/Reference/Core/Const.md (the "Array constants" section) carries a `> [!WARNING]` for it, naming BETA 997 (a crash, owner's rule), removed once a fixed build is released. Related: array-const-element-overflow-crash. -->
+
+---
+
+## `ShiftRotateLeft`, `ShiftRotateRight`, `ShiftUnsignedRight` and `ByteSwap` ignore argument names and take their arguments by position
+
+**Describe the bug**
+The four new intrinsics of the VBA package (BETA 997) take their arguments by position and discard the names a call gives. `ShiftRotateLeft(ShiftAmount:=4, Number:=n)` uses 4 as the number and `n` as the shift amount, with no error, so the result is wrong. A name that matches no parameter, as in `ShiftRotateLeft(Foo:=n, Bar:=k)`, is accepted too. An ordinary procedure honours the names. Observed in a run of the reproducer project.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `math-intrinsics-ignore-argument-names.twinproj` (attached as `math-intrinsics-ignore-argument-names.zip`). Its `Sub Main` calls each intrinsic with a `Long` `n` of `&H12345678` and `k` of 4, in several forms.
+2. Run it (F5) and read the DEBUG CONSOLE:
+   ```
+   positional                  23456781
+   named, in order             23456781
+   named, swapped              4000000
+   right, named, swapped       400
+   unsigned, named, swapped    0
+   unknown names               23456781
+   ByteSwap, unknown name      78563412
+   own function, swapped       23456781
+   ```
+
+**Expected behavior**
+The names select the parameters, as they do for any procedure (the last line, a function of the project with the same parameter names): `ShiftRotateLeft(ShiftAmount:=4, Number:=n)` is `23456781`, `ShiftRotateRight` of the same is `81234567` and `ShiftUnsignedRight` is `01234567`. A name that matches no parameter is a compile error, as it is in VB6 (*Named argument not found*).
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 997
+
+**Additional context**
+The four intrinsics are new in BETA 997; BETA 995 does not know them (TB5079). VB6 has no equivalent functions, so there is no VB6 project; the VB6 behaviour quoted is for a named argument that matches no parameter.
+
+The declared parameters are `Number` and `ShiftAmount` (`ByteSwap` has `Number`). `Compilation.UnrollLoop Bogus:=4` is accepted in the same way. Calls that give the arguments in declaration order, with or without the names, work.
+
+Severity: a silent wrong result, but only for a call that names its arguments out of declaration order or misspells a name.
+
+<!-- Reproducer: bugs/math-intrinsics-ignore-argument-names/ (mode run, expects the eight lines above); verified on BETA 997 by `bug_repro.mjs verify`; not on 995 (the functions do not exist there). VB6 has no such function: `vb6run` gives *Sub or Function not defined* (beta997-probes/vb6, v1 to v3). docs/Reference/Default/VBA/Math/ShiftRotateLeft.md, ShiftRotateRight.md and ShiftUnsignedRight.md each carry a `> [!WARNING]` for it (ByteSwap.md none: with one argument, any name gives the right result), naming BETA 997 (a silent wrong result, owner's rule), removed once a fixed build is released. -->
+
+---
+
+## A module-level array `Const` declared after a procedure is not found by the procedures that follow it
+
+**Describe the bug**
+In a module, an array `Const` that is declared after a procedure cannot be used by the procedures declared after it: the use is TB5079, *Unrecognized symbol*. A scalar `Const` in the same place works. A procedure declared before the constant does see the name, and reads the array as empty: `Arr(1)` raises error 9 at run time. Observed in the compiler's diagnostics.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `array-const-after-procedure-not-found.twinproj` (attached as `array-const-after-procedure-not-found.zip`). Its module is:
+   ```
+   Module Startup
+       Public Sub Main()
+       End Sub
+       Const Scalar As Long = 5
+       Const Arr() As Long = Array(1, 2, 3)
+       Public Sub UseIt()
+           Debug.Print Scalar
+           Debug.Print Arr(1)
+       End Sub
+   End Module
+   ```
+2. Compile it. The only error is `TB5079 Unrecognized symbol 'Arr'` on the use in `UseIt`; `Scalar` is found.
+
+**Expected behavior**
+No error: the constant is visible to every procedure of the module wherever it is declared, as a scalar `Const` is.
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 997
+
+**Additional context**
+BETA 995 has no array constants (TB5245). VB6 has none either, so there is no VB6 project.
+
+Any procedure kind before the constant has the effect: a `Sub`, a `Function` and a `Property Get` were each checked. A declaration before the first procedure is fine, as are one after a `Dim`, an `Enum` or a `Type`. A `Public` array `Const` after a procedure is also unreachable from another module: `Startup.Arr(1)` is TB5027. Qualifying the name inside the module does not help. Classes are not affected: the order does not matter there.
+
+A procedure declared before the constant does find it, and then fails at run time. With `[RunAfterBuild] Public Sub Run()` first and `Const Arr() As Long = Array(1, 2, 3)` after it, `v = Arr(1)` under `On Error Resume Next` leaves `Err=9 Subscript out of range` and `v` unchanged.
+
+Severity: low, since the use is refused with an error; the run-time error 9 in an earlier procedure is a less obvious form of the same fault.
+
+<!-- Reproducer: bugs/array-const-after-procedure-not-found/ (mode compile, expects exit 1 and TB5079); verified on BETA 997 by `bug_repro.mjs verify`; on 995 TB5245. The earlier-procedure case (error 9), the Function, Property and cross-module cases were checked with tbbuild and tbrun on 997 in scratch projects, not in the reproducer. docs/Reference/Core/Const.md (the "Array constants" section) carries a `> [!NOTE]` for it, naming BETA 997: declare an array Const before the first procedure of its module; removed once a fixed build is released. -->
+
+---
+
+## A `Public` array `Const` in a class is accepted but cannot be reached from outside, where a `Public` scalar `Const` is refused
+
+**Describe the bug**
+A class may not have a `Public` constant: `Public Const Num As Long = 5` in a class is refused with TB5250, *Constants in a class cannot be Public*. For an array constant the declaration `Public Const Arr() As Long = Array(1, 2, 3)` is accepted without a diagnostic, and then `Arr` cannot be reached from outside the class: `obj.Arr(1)` is TB5027, *Unrecognized member*. The declaration is accepted and the constant is private in practice. Observed in the compiler's diagnostics.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `class-public-array-const-unreachable.twinproj` (attached as `class-public-array-const-unreachable.zip`). Class `WithArray` declares `Public Const Arr() As Long = Array(1, 2, 3)` and class `WithScalar` declares `Public Const Num As Long = 5`. `Sub Main` reads `a.Arr(1)` and `s.Num` from instances.
+2. Compile it. The diagnostics are:
+   ```
+   Startup.twin [7,21]: TB5027 Unrecognized member 'Arr' on type '_WithArray' [non-extensible object]
+   Startup.twin [8,21]: TB5027 Unrecognized member 'Num' on type '_WithScalar' [non-extensible object]
+   WithScalar.twin [3,18]: TB5250 Constants in a class cannot be Public
+   ```
+   The declaration in `WithArray` has no diagnostic of its own.
+
+**Expected behavior**
+The same refusal for both: TB5250 on the declaration of `Arr`, so that the cause is named at the declaration and not as an unrecognized member at each use.
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 997
+
+**Additional context**
+BETA 995 has no array constants (TB5245). VB6 has none either, so there is no VB6 project; a `Public Const` in a VB6 class is refused.
+
+Inside the class, the array constant reads correctly (`Arr(1)` in `WithArray.Show`). A `Private` array `Const` in a class works, and `Friend`, `Protected` and `Static` are accepted as well.
+
+Severity: low. The error appears at the use, with a message that does not mention the declaration.
+
+<!-- Reproducer: bugs/class-public-array-const-unreachable/ (mode compile, expects TB5027 and TB5250); verified on BETA 997 by `bug_repro.mjs verify`; on 995 TB5245. The VB6 remark is from knowledge of VB6, not run. docs/Reference/Core/Const.md (the "Array constants" section) carries a `> [!NOTE]` for it, naming BETA 997; removed once a fixed build is released. -->
+
+---
+
+## Passing a module-level array `Const` to a `ParamArray` compiles clean and then fails with a codegen error
+
+**Describe the bug**
+A module-level array `Const` passed as the argument of a `ParamArray` parameter compiles without a diagnostic, and the build then fails: the linker reports *compilation (codegen) error detected* at the call. The same constant passed to a parameter declared `a() As Long` is refused at compile time with TB5001, and to a `Variant` parameter with TB5077, so the `ParamArray` case slips through the check. Observed with `tbbuild --build`.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `array-const-paramarray-codegen-error.twinproj` (attached as `array-const-paramarray-codegen-error.zip`). Its module:
+   ```
+   Module Startup
+       Const Values() As Long = Array(10, 20, 30)
+       Public Sub Main()
+           Count Values
+       End Sub
+       Private Sub Count(ParamArray Items() As Variant)
+           Debug.Print UBound(Items)
+       End Sub
+   End Module
+   ```
+2. Compile it: no errors. Build it (or press F5).
+3. The build log reads `[LINKER] compilation (codegen) error detected in 'Startup.Mainrootmain' at line #7` and `[BUILD] failed`.
+
+**Expected behavior**
+A compile error at the call, as for the other whole-array uses of a constant array (TB5001 or TB5077). Documentation says the array "cannot be assigned to an array variable or a Variant, or passed as an array argument".
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 997
+
+**Additional context**
+BETA 995 has no array constants (TB5245). VB6 has none either, so there is no VB6 project.
+
+With LLVM the same call gives *a feature used in your code is not yet supported with the LLVM compiler*.
+
+What does not reproduce it: the constant passed after another argument (`Count 1, Values`) fails the same way, but `Count Values(0)`, an element, builds clean, an ordinary array variable passed to a `ParamArray` builds clean, and a constant array declared inside the procedure builds clean.
+
+Severity: low. The build fails with a message that gives the line, but not the cause.
+
+<!-- Reproducer: bugs/array-const-paramarray-codegen-error/ (mode build, expects tbbuild exit 5 and "codegen" in the message); verified on BETA 997 by `bug_repro.mjs verify`; on 995 TB5245. The LLVM message is from the probe c15_paramarray run with `tbrun --llvm` on 997. The quoted documentation sentence is docs/Reference/Core/Const.md, "Array constants". That page carries a `> [!NOTE]` for it, naming BETA 997; removed once a fixed build is released. -->
+
+---
+
+## LLVM-compiled code rounds a `Single` or `Double` to an integer half away from zero, where VB6 and plain code round half to even
+
+**Describe the bug**
+In a procedure compiled with LLVM, `CLng`, `CInt` and `CLngLng` of a `Single` or `Double` variable, an assignment of one to a `Long` or `Integer`, and the operand conversion of `\` round a value exactly halfway between two integers away from zero: `CLng(2.5)` of a `Double` variable is 3 and `CLng(-0.5)` is -1. The same code without LLVM rounds to the even integer, 2 and 0, as VB6 does. A value that is not a tie rounds the same everywhere. Observed in a run of the reproducer project.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `llvm-conversion-rounds-half-away.twinproj` (attached as `llvm-conversion-rounds-half-away.zip`). It needs an LLVM licence (Ultimate): `LlvmCases` is compiled with LLVM by its `[CompilerOptions("+llvm")]`, and `PlainCases` holds the same statements without it. Each procedure converts 0.5, 2.5, 3.5, -0.5 and -2.5.
+2. Run it (F5). The DEBUG CONSOLE has one line per value and mode; for 2.5 and -0.5 they read:
+   ```
+   plain 2.5:  CLng(d)=2  CLng(s)=2  CInt(d)=2  CLngLng(d)=2  l=d:2  d\1=2  CLng(v)=2  Round=2
+   plain -0.5:  CLng(d)=0  CLng(s)=0  CInt(d)=0  CLngLng(d)=0  l=d:0  d\1=0  CLng(v)=0  Round=0
+   LLVM  2.5:  CLng(d)=3  CLng(s)=3  CInt(d)=3  CLngLng(d)=3  l=d:3  d\1=3  CLng(v)=2  Round=2
+   LLVM  -0.5:  CLng(d)=-1  CLng(s)=-1  CInt(d)=-1  CLngLng(d)=-1  l=d:-1  d\1=-1  CLng(v)=0  Round=0
+   ```
+
+**Expected behavior**
+The same result in both: round half to even, as in VB6 (attached as `llvm-conversion-rounds-half-away-vb6.zip`), which prints for the same values `CLng(d)=2` for 2.5 and `CLng(d)=0` for -0.5, `l=d:2`, `d\1=2`, `CLng(v)=2` and `Round=2`, `0` and `0`. VB6 has no `LongLong`, so that column is missing from its output.
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 997
+
+**Additional context**
+Also on BETA 995, identically, and on win64.
+
+What does not differ in LLVM-compiled code: `CLng` of a `Variant` holding the `Double`, `Round`, `Int` and `Fix`, and conversions of a literal such as `CLng(2.5)` (folded to 2 by the compiler).
+
+A consequence: a value that rounds to zero in plain code can raise an error under LLVM. In a `Byte` conversion, `CByte(-0.5)` and `b = -0.5` (a `Double` variable) give 0 without LLVM and error 6, *Overflow*, with it, because the value becomes -1.
+
+Severity: a silent wrong result, at ties only, unless the rounding makes a conversion overflow.
+
+<!-- Reproducer: bugs/llvm-conversion-rounds-half-away/ (mode run: the LLVM procedure is compiled by its attribute, so `bug_repro.mjs run` needs no flag; expects the plain and LLVM lines above); verified on BETA 997 and 995 with `bug_repro.mjs run`, and on 997 with --arch win64. VB6: `bug_repro.mjs vb6 llvm-conversion-rounds-half-away`. The CByte case was run in a scratch project on 997. docs/LLVM/Getting-Started.md ("Language support") carries a `> [!WARNING]` for it, naming BETA 997 (a silent wrong result, owner's rule), removed once a fixed build is released. Related: llvm-double-overflow-no-error. -->
+
+---
+
+## In LLVM-compiled code a shift count is cut to the width of the shifted `Byte` or `Integer`
+
+**Describe the bug**
+In a procedure compiled with LLVM, the count of `<<` or `>>` is reduced to the width of the shifted type before the shift, for a `Byte` and an `Integer`: `b << 256` with `b` a `Byte` of `&H81` leaves `&H81`, and `b >> 257` gives `&H40`, because the count becomes 0 and 1. Without LLVM both give 0, as the documentation says: a shift by as many bits as the type holds, or more, yields 0. An `Integer` shifted by 65536 or more behaves the same way. A `Long` is not affected, as the count is itself a `Long`. Observed in a run of the reproducer project.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Open `llvm-shift-count-truncated.twinproj` (attached as `llvm-shift-count-truncated.zip`). It needs an LLVM licence (Ultimate): `LlvmCases` is compiled with LLVM by its `[CompilerOptions("+llvm")]`, and `PlainCases` holds the same statements without it.
+2. Run it (F5) and read the DEBUG CONSOLE:
+   ```
+   plain  Byte    << 256    0
+   plain  Byte    >> 257    0
+   plain  Integer << 65536  0
+   plain  Integer >> 65537  0
+   plain  Long    << 65536  0
+   plain  Long    << -1     80000000
+   plain  Long    >> -1     FFFFFFFF
+   LLVM   Byte    << 256    81
+   LLVM   Byte    >> 257    40
+   LLVM   Integer << 65536  8001
+   LLVM   Integer >> 65537  C000
+   LLVM   Long    << 65536  0
+   LLVM   Long    << -1     0
+   LLVM   Long    >> -1     0
+   ```
+
+**Expected behavior**
+0 for a `Byte` shifted by 8 or more, and for an `Integer` shifted by 16 or more, whatever the count, in LLVM-compiled code as without LLVM (docs/Reference/Core/LeftShift.md and RightShift.md: "A shift by as many bits as the type holds, or more, yields 0"). VB6 has no shift operators, so there is no VB6 project.
+
+**Desktop:**
+ - OS: Windows 10 Pro 22H2 (build 19045)
+ - twinBASIC compiler version: BETA 997
+
+**Additional context**
+Also on BETA 995, identically, and on win64.
+
+Counts from 8 to 255 for a `Byte`, and 16 to 65535 for an `Integer`, give 0 in both modes. The difference starts where the count, taken modulo 256 or 65536, is below the width.
+
+A negative count also differs between the two modes, and the documentation calls the result of a negative count "no useful result". Without LLVM the count is reduced modulo 32 for every type (`1& << -1` is `&H80000000`, `&H80000001 >> -1` is `&HFFFFFFFF`); with LLVM a negative count gives 0 (a `Long`, `LongLong` or `Integer`; a `Byte` gives 0 too). Neither is documented, so that part is a difference, not a departure.
+
+Severity: a silent wrong result for a `Byte` shifted by 256 or more, or an `Integer` by 65536 or more. Counts that large are rare.
+
+<!-- Reproducer: bugs/llvm-shift-count-truncated/ (mode run: the LLVM procedure is compiled by its attribute; expects the Byte and Integer lines above); verified on BETA 997 and 995 with `bug_repro.mjs run`, and on 997 with --arch win64; the count table over Byte, Integer and Long is from a scratch run in both modes (beta997-probes cases7), and the Long and LongLong negative-count rows from probes/m03_values/diff_plain_vs_llvm.txt. docs/Reference/Core/LeftShift.md and RightShift.md each carry a `> [!WARNING]` for the Byte and Integer count (the documented rule is the one LLVM breaks), and docs/LLVM/Getting-Started.md ("Language support") may carry a `> [!NOTE]` for the negative count; naming BETA 997; removed once a fixed build is released. -->
+
+
 
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new file mode 100644
index 000000000..92a3ac258
--- /dev/null
+++ b/bugs/array-const-after-procedure-not-found/repro.json
@@ -0,0 +1,7 @@
+{
+  "mode": "compile",
+  "expect": {
+    "exit": 1,
+    "diagnostics": ["TB5079"]
+  }
+}
diff --git a/bugs/array-const-after-procedure-not-found/src/Settings b/bugs/array-const-after-procedure-not-found/src/Settings
new file mode 100644
index 000000000..73daf6f22
--- /dev/null
+++ b/bugs/array-const-after-procedure-not-found/src/Settings
@@ -0,0 +1,61 @@
+{
+	"configuration.inherits": "Defaults",
+	"project.appTitle": "ArrayConstAfterProcedureNotFound",
+	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
+	"project.buildType": "Standard EXE",
+	"project.description": "Reproduces: A module-level array Const declared after a procedure is not found by the procedures that follow it",
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+	"project.id": "{2BEB2C3D-7435-4AB0-9355-BAFDA31BBC8A}",
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diff --git a/bugs/array-const-after-procedure-not-found/src/Sources/Startup.twin b/bugs/array-const-after-procedure-not-found/src/Sources/Startup.twin
new file mode 100644
index 000000000..cd3df4bf1
--- /dev/null
+++ b/bugs/array-const-after-procedure-not-found/src/Sources/Startup.twin
@@ -0,0 +1,15 @@
+' A module-level array Const declared after a procedure is not found by the procedures that follow it.
+Module Startup
+
+    Public Sub Main()
+    End Sub
+
+    Const Scalar As Long = 5
+    Const Arr() As Long = Array(1, 2, 3)
+
+    Public Sub UseIt()
+        Debug.Print Scalar
+        Debug.Print Arr(1)
+    End Sub
+
+End Module
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new file mode 100644
index 000000000..db90b39cf
--- /dev/null
+++ b/bugs/array-const-element-overflow-crash/repro.json
@@ -0,0 +1,6 @@
+{
+  "mode": "compile",
+  "expect": {
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+  }
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new file mode 100644
index 000000000..9f9b64492
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diff --git a/bugs/array-const-element-overflow-crash/src/Sources/Startup.twin b/bugs/array-const-element-overflow-crash/src/Sources/Startup.twin
new file mode 100644
index 000000000..f3ad96fac
--- /dev/null
+++ b/bugs/array-const-element-overflow-crash/src/Sources/Startup.twin
@@ -0,0 +1,9 @@
+' Crashes the compiler: an array Const whose element does not fit the element type.
+Module Startup
+
+    Const Big() As Long = Array(2147483648)
+
+    Public Sub Main()
+    End Sub
+
+End Module
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diff --git a/bugs/array-const-in-array-const-crash/repro.json b/bugs/array-const-in-array-const-crash/repro.json
new file mode 100644
index 000000000..db90b39cf
--- /dev/null
+++ b/bugs/array-const-in-array-const-crash/repro.json
@@ -0,0 +1,6 @@
+{
+  "mode": "compile",
+  "expect": {
+    "exit": 4
+  }
+}
diff --git a/bugs/array-const-in-array-const-crash/src/Settings b/bugs/array-const-in-array-const-crash/src/Settings
new file mode 100644
index 000000000..7059415f1
--- /dev/null
+++ b/bugs/array-const-in-array-const-crash/src/Settings
@@ -0,0 +1,61 @@
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+	"project.appTitle": "ArrayConstInArrayConstCrash",
+	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
+	"project.buildType": "Standard EXE",
+	"project.description": "Reproduces: A module-level array Const initialised from an element of another array Const crashes the compiler",
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+	"project.id": "{155E2A64-CA94-4EBE-B050-FAC1C69B8ED9}",
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+			"id": "{00020430-0000-0000-C000-000000000046}",
+			"lcid": 0,
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+			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
+			"path64": "C:\\Windows\\System32\\stdole2.tlb",
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+		},
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+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "VB",
+			"versionBuild": 0,
+			"versionMajor": 0,
+			"versionMinor": 0,
+			"versionRevision": 31
+		},
+		{
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+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "AppGlobalClassProject",
+			"versionBuild": 0,
+			"versionMajor": 1,
+			"versionMinor": 0,
+			"versionRevision": 0
+		}
+	],
+	"project.settingsVersion": 1,
+	"project.startupObject": "Sub Main",
+	"project.warnings": {
+		"errors": [],
+		"hints": [],
+		"ignored": [],
+		"info": [],
+		"warnings": []
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+	"runtime.useUnicodeStandardLibrary": true
+}
diff --git a/bugs/array-const-in-array-const-crash/src/Sources/Startup.twin b/bugs/array-const-in-array-const-crash/src/Sources/Startup.twin
new file mode 100644
index 000000000..b046b14ee
--- /dev/null
+++ b/bugs/array-const-in-array-const-crash/src/Sources/Startup.twin
@@ -0,0 +1,10 @@
+' Crashes the compiler: an array Const initialised from an element of another array Const.
+Module Startup
+
+    Const A() As Long = Array(1, 2, 3)
+    Const B() As Long = Array(A(0))
+
+    Public Sub Main()
+    End Sub
+
+End Module
diff --git a/bugs/array-const-paramarray-codegen-error/array-const-paramarray-codegen-error.twinproj b/bugs/array-const-paramarray-codegen-error/array-const-paramarray-codegen-error.twinproj
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diff --git a/bugs/array-const-paramarray-codegen-error/repro.json b/bugs/array-const-paramarray-codegen-error/repro.json
new file mode 100644
index 000000000..d43c1f71d
--- /dev/null
+++ b/bugs/array-const-paramarray-codegen-error/repro.json
@@ -0,0 +1,7 @@
+{
+  "mode": "build",
+  "expect": {
+    "exit": 5,
+    "message": "codegen"
+  }
+}
diff --git a/bugs/array-const-paramarray-codegen-error/src/Settings b/bugs/array-const-paramarray-codegen-error/src/Settings
new file mode 100644
index 000000000..0c521c124
--- /dev/null
+++ b/bugs/array-const-paramarray-codegen-error/src/Settings
@@ -0,0 +1,61 @@
+{
+	"configuration.inherits": "Defaults",
+	"project.appTitle": "ArrayConstParamarrayCodegenError",
+	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
+	"project.buildType": "Standard EXE",
+	"project.description": "Reproduces: Passing a module-level array Const to a ParamArray compiles clean and then fails with a codegen error",
+	"project.exportPathIsV2": true,
+	"project.id": "{905FF907-B511-47BF-9641-9C0CE6049E83}",
+	"project.name": "ArrayConstParamarrayCodegenError",
+	"project.optionExplicit": true,
+	"project.references": [
+		{
+			"id": "{00020430-0000-0000-C000-000000000046}",
+			"lcid": 0,
+			"name": "OLE Automation",
+			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
+			"path64": "C:\\Windows\\System32\\stdole2.tlb",
+			"symbolId": "stdole",
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+			"versionMinor": 0
+		},
+		{
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+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
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+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
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+			"versionRevision": 31
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+			"path64": "",
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+			"versionRevision": 0
+		}
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+	"project.settingsVersion": 1,
+	"project.startupObject": "Sub Main",
+	"project.warnings": {
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+		"hints": [],
+		"ignored": [],
+		"info": [],
+		"warnings": []
+	},
+	"runtime.useUnicodeStandardLibrary": true
+}
diff --git a/bugs/array-const-paramarray-codegen-error/src/Sources/Startup.twin b/bugs/array-const-paramarray-codegen-error/src/Sources/Startup.twin
new file mode 100644
index 000000000..c491c6764
--- /dev/null
+++ b/bugs/array-const-paramarray-codegen-error/src/Sources/Startup.twin
@@ -0,0 +1,14 @@
+' A module-level array Const passed to a ParamArray compiles clean, and the build fails with a codegen error.
+Module Startup
+
+    Const Values() As Long = Array(10, 20, 30)
+
+    Public Sub Main()
+        Count Values
+    End Sub
+
+    Private Sub Count(ParamArray Items() As Variant)
+        Debug.Print UBound(Items)
+    End Sub
+
+End Module
diff --git a/bugs/class-public-array-const-unreachable/class-public-array-const-unreachable.twinproj b/bugs/class-public-array-const-unreachable/class-public-array-const-unreachable.twinproj
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diff --git a/bugs/class-public-array-const-unreachable/repro.json b/bugs/class-public-array-const-unreachable/repro.json
new file mode 100644
index 000000000..c665aa318
--- /dev/null
+++ b/bugs/class-public-array-const-unreachable/repro.json
@@ -0,0 +1,7 @@
+{
+  "mode": "compile",
+  "expect": {
+    "exit": 1,
+    "diagnostics": ["TB5027", "TB5250"]
+  }
+}
diff --git a/bugs/class-public-array-const-unreachable/src/Settings b/bugs/class-public-array-const-unreachable/src/Settings
new file mode 100644
index 000000000..145b727d8
--- /dev/null
+++ b/bugs/class-public-array-const-unreachable/src/Settings
@@ -0,0 +1,61 @@
+{
+	"configuration.inherits": "Defaults",
+	"project.appTitle": "ClassPublicArrayConstUnreachable",
+	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
+	"project.buildType": "Standard EXE",
+	"project.description": "Reproduces: A Public array Const in a class is accepted but cannot be reached from outside, where a Public scalar Const is refused",
+	"project.exportPathIsV2": true,
+	"project.id": "{5E544EA9-CBDF-4369-AE04-F88DCF5047A5}",
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+	"project.references": [
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+	"project.warnings": {
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+		"hints": [],
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+		"info": [],
+		"warnings": []
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diff --git a/bugs/class-public-array-const-unreachable/src/Sources/Startup.twin b/bugs/class-public-array-const-unreachable/src/Sources/Startup.twin
new file mode 100644
index 000000000..2ec58f224
--- /dev/null
+++ b/bugs/class-public-array-const-unreachable/src/Sources/Startup.twin
@@ -0,0 +1,11 @@
+' A Public array Const in a class is accepted but cannot be reached; a Public scalar Const is refused.
+Module Startup
+
+    Public Sub Main()
+        Dim a As New WithArray
+        Dim s As New WithScalar
+        Debug.Print a.Arr(1)
+        Debug.Print s.Num
+    End Sub
+
+End Module
diff --git a/bugs/class-public-array-const-unreachable/src/Sources/WithArray.twin b/bugs/class-public-array-const-unreachable/src/Sources/WithArray.twin
new file mode 100644
index 000000000..174556bef
--- /dev/null
+++ b/bugs/class-public-array-const-unreachable/src/Sources/WithArray.twin
@@ -0,0 +1,9 @@
+Class WithArray
+
+    Public Const Arr() As Long = Array(1, 2, 3)
+
+    Public Sub Show()
+        Debug.Print Arr(1)
+    End Sub
+
+End Class
diff --git a/bugs/class-public-array-const-unreachable/src/Sources/WithScalar.twin b/bugs/class-public-array-const-unreachable/src/Sources/WithScalar.twin
new file mode 100644
index 000000000..dcf91595c
--- /dev/null
+++ b/bugs/class-public-array-const-unreachable/src/Sources/WithScalar.twin
@@ -0,0 +1,5 @@
+Class WithScalar
+
+    Public Const Num As Long = 5
+
+End Class
diff --git a/bugs/llvm-conversion-rounds-half-away/llvm-conversion-rounds-half-away.twinproj b/bugs/llvm-conversion-rounds-half-away/llvm-conversion-rounds-half-away.twinproj
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diff --git a/bugs/llvm-conversion-rounds-half-away/repro.json b/bugs/llvm-conversion-rounds-half-away/repro.json
new file mode 100644
index 000000000..6dc062226
--- /dev/null
+++ b/bugs/llvm-conversion-rounds-half-away/repro.json
@@ -0,0 +1,12 @@
+{
+  "mode": "run",
+  "expect": {
+    "exit": 0,
+    "output": [
+      "^plain 2\\.5:\\s+CLng\\(d\\)=2\\s",
+      "^plain -0\\.5:\\s+CLng\\(d\\)=0\\s",
+      "^LLVM\\s+2\\.5:\\s+CLng\\(d\\)=3\\s+CLng\\(s\\)=3\\s+CInt\\(d\\)=3\\s+CLngLng\\(d\\)=3\\s+l=d:3\\s+d\\\\1=3\\s+CLng\\(v\\)=2\\s+Round=2$",
+      "^LLVM\\s+-0\\.5:\\s+CLng\\(d\\)=-1\\s"
+    ]
+  }
+}
diff --git a/bugs/llvm-conversion-rounds-half-away/src/Settings b/bugs/llvm-conversion-rounds-half-away/src/Settings
new file mode 100644
index 000000000..a9ff307f5
--- /dev/null
+++ b/bugs/llvm-conversion-rounds-half-away/src/Settings
@@ -0,0 +1,61 @@
+{
+	"configuration.inherits": "Defaults",
+	"project.appTitle": "LlvmConversionRoundsHalfAway",
+	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
+	"project.buildType": "Standard EXE",
+	"project.description": "Reproduces: LLVM-compiled code rounds a Single or Double to an integer half away from zero, where VB6 and plain code round half to even",
+	"project.exportPathIsV2": true,
+	"project.id": "{8ABB5233-02CD-48C9-A0C8-C67DD5442C43}",
+	"project.name": "LlvmConversionRoundsHalfAway",
+	"project.optionExplicit": true,
+	"project.references": [
+		{
+			"id": "{00020430-0000-0000-C000-000000000046}",
+			"lcid": 0,
+			"name": "OLE Automation",
+			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
+			"path64": "C:\\Windows\\System32\\stdole2.tlb",
+			"symbolId": "stdole",
+			"versionMajor": 2,
+			"versionMinor": 0
+		},
+		{
+			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "VB",
+			"versionBuild": 0,
+			"versionMajor": 0,
+			"versionMinor": 0,
+			"versionRevision": 31
+		},
+		{
+			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "AppGlobalClassProject",
+			"versionBuild": 0,
+			"versionMajor": 1,
+			"versionMinor": 0,
+			"versionRevision": 0
+		}
+	],
+	"project.settingsVersion": 1,
+	"project.startupObject": "Sub Main",
+	"project.warnings": {
+		"errors": [],
+		"hints": [],
+		"ignored": [],
+		"info": [],
+		"warnings": []
+	},
+	"runtime.useUnicodeStandardLibrary": true
+}
diff --git a/bugs/llvm-conversion-rounds-half-away/src/Sources/Startup.twin b/bugs/llvm-conversion-rounds-half-away/src/Sources/Startup.twin
new file mode 100644
index 000000000..51dc658c7
--- /dev/null
+++ b/bugs/llvm-conversion-rounds-half-away/src/Sources/Startup.twin
@@ -0,0 +1,31 @@
+' Rounding a Single or Double to an integer: plain code rounds half to even, LLVM-compiled code half away from zero.
+' Needs an LLVM licence (Ultimate): LlvmCases is compiled with LLVM by its [CompilerOptions("+llvm")].
+Module Startup
+
+    Private Sub PlainCases()
+        Dim d As Double, s As Single, v As Variant, l As Long
+        Dim x As Variant
+        For Each x In Array(0.5, 2.5, 3.5, -0.5, -2.5)
+            d = x: s = x: v = d
+            l = d
+            Debug.Print "plain " & d & ":  CLng(d)=" & CLng(d) & "  CLng(s)=" & CLng(s) & "  CInt(d)=" & CInt(d) & "  CLngLng(d)=" & CLngLng(d) & "  l=d:" & l & "  d\1=" & (d \ 1) & "  CLng(v)=" & CLng(v) & "  Round=" & Round(d)
+        Next
+    End Sub
+
+    [CompilerOptions("+llvm")]
+    Private Sub LlvmCases()
+        Dim d As Double, s As Single, v As Variant, l As Long
+        Dim x As Variant
+        For Each x In Array(0.5, 2.5, 3.5, -0.5, -2.5)
+            d = x: s = x: v = d
+            l = d
+            Debug.Print "LLVM  " & d & ":  CLng(d)=" & CLng(d) & "  CLng(s)=" & CLng(s) & "  CInt(d)=" & CInt(d) & "  CLngLng(d)=" & CLngLng(d) & "  l=d:" & l & "  d\1=" & (d \ 1) & "  CLng(v)=" & CLng(v) & "  Round=" & Round(d)
+        Next
+    End Sub
+
+    Public Sub Main()
+        PlainCases
+        LlvmCases
+    End Sub
+
+End Module
diff --git a/bugs/llvm-conversion-rounds-half-away/vb6/Module1.bas b/bugs/llvm-conversion-rounds-half-away/vb6/Module1.bas
new file mode 100644
index 000000000..fd2a36fae
--- /dev/null
+++ b/bugs/llvm-conversion-rounds-half-away/vb6/Module1.bas
@@ -0,0 +1,23 @@
+Attribute VB_Name = "Module1"
+Option Explicit
+
+Sub Main()
+    Dim d As Double
+    Dim s As Single
+    Dim v As Variant
+    Dim l As Long
+    Dim x As Variant
+    On Error GoTo Fail
+    Open App.Path & "\out.txt" For Output As #9
+    For Each x In Array(0.5, 2.5, 3.5, -0.5, -2.5)
+        d = x: s = x: v = d
+        l = d
+        Print #9, "VB6   " & d & ":  CLng(d)=" & CLng(d) & "  CLng(s)=" & CLng(s) & "  CInt(d)=" & CInt(d) & "  l=d:" & l & "  d\1=" & (d \ 1) & "  CLng(v)=" & CLng(v) & "  Round=" & Round(d)
+    Next
+    Close #9
+    Exit Sub
+Fail:
+    On Error Resume Next
+    Print #9, "unhandled error " & Err.Number & ": " & Err.Description
+    Close #9
+End Sub
diff --git a/bugs/llvm-conversion-rounds-half-away/vb6/Probe.vbp b/bugs/llvm-conversion-rounds-half-away/vb6/Probe.vbp
new file mode 100644
index 000000000..4d210b0e8
--- /dev/null
+++ b/bugs/llvm-conversion-rounds-half-away/vb6/Probe.vbp
@@ -0,0 +1,7 @@
+Type=Exe
+Module=Module1; Module1.bas
+Startup="Sub Main"
+ExeName32="Probe.exe"
+Name="Probe"
+CompilationType=0
+OptimizationType=0
diff --git a/bugs/llvm-shift-count-truncated/llvm-shift-count-truncated.twinproj b/bugs/llvm-shift-count-truncated/llvm-shift-count-truncated.twinproj
new file mode 100644
index 0000000000000000000000000000000000000000..2850a8e38c81bc68d3277dec26cdc473b3c1b90e
GIT binary patch
literal 3789
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zoc(kC6YV);n>ZKR0<F|MIQE<~-}%nxGjqm2eER11jokOST(0k3O^+w+Qkp^J%M%{?
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literal 0
HcmV?d00001

diff --git a/bugs/llvm-shift-count-truncated/repro.json b/bugs/llvm-shift-count-truncated/repro.json
new file mode 100644
index 000000000..ba7f8b8bc
--- /dev/null
+++ b/bugs/llvm-shift-count-truncated/repro.json
@@ -0,0 +1,14 @@
+{
+  "mode": "run",
+  "expect": {
+    "exit": 0,
+    "output": [
+      "^plain\\s+Byte\\s+<< 256\\s+0$",
+      "^plain\\s+Integer << 65536\\s+0$",
+      "^LLVM\\s+Byte\\s+<< 256\\s+81$",
+      "^LLVM\\s+Byte\\s+>> 257\\s+40$",
+      "^LLVM\\s+Integer << 65536\\s+8001$",
+      "^LLVM\\s+Integer >> 65537\\s+C000$"
+    ]
+  }
+}
diff --git a/bugs/llvm-shift-count-truncated/src/Settings b/bugs/llvm-shift-count-truncated/src/Settings
new file mode 100644
index 000000000..dbca49875
--- /dev/null
+++ b/bugs/llvm-shift-count-truncated/src/Settings
@@ -0,0 +1,61 @@
+{
+	"configuration.inherits": "Defaults",
+	"project.appTitle": "LlvmShiftCountTruncated",
+	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
+	"project.buildType": "Standard EXE",
+	"project.description": "Reproduces: In LLVM-compiled code a shift count is cut to the width of the shifted Byte or Integer",
+	"project.exportPathIsV2": true,
+	"project.id": "{866FFD96-BEB9-450F-9C8E-9A6579A6F69A}",
+	"project.name": "LlvmShiftCountTruncated",
+	"project.optionExplicit": true,
+	"project.references": [
+		{
+			"id": "{00020430-0000-0000-C000-000000000046}",
+			"lcid": 0,
+			"name": "OLE Automation",
+			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
+			"path64": "C:\\Windows\\System32\\stdole2.tlb",
+			"symbolId": "stdole",
+			"versionMajor": 2,
+			"versionMinor": 0
+		},
+		{
+			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "VB",
+			"versionBuild": 0,
+			"versionMajor": 0,
+			"versionMinor": 0,
+			"versionRevision": 31
+		},
+		{
+			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "AppGlobalClassProject",
+			"versionBuild": 0,
+			"versionMajor": 1,
+			"versionMinor": 0,
+			"versionRevision": 0
+		}
+	],
+	"project.settingsVersion": 1,
+	"project.startupObject": "Sub Main",
+	"project.warnings": {
+		"errors": [],
+		"hints": [],
+		"ignored": [],
+		"info": [],
+		"warnings": []
+	},
+	"runtime.useUnicodeStandardLibrary": true
+}
diff --git a/bugs/llvm-shift-count-truncated/src/Sources/Startup.twin b/bugs/llvm-shift-count-truncated/src/Sources/Startup.twin
new file mode 100644
index 000000000..88e1e722b
--- /dev/null
+++ b/bugs/llvm-shift-count-truncated/src/Sources/Startup.twin
@@ -0,0 +1,39 @@
+' A shift count is cut to the width of the shifted Byte or Integer in LLVM-compiled code.
+' Needs an LLVM licence (Ultimate): LlvmCases is compiled with LLVM by its [CompilerOptions("+llvm")].
+Module Startup
+
+    Private Sub PlainCases()
+        Dim b As Byte = &H81
+        Dim i As Integer = &H8001
+        Dim l As Long = &H80000001
+        Dim n As Long
+        n = 256: Debug.Print "plain  Byte    << 256    " & Hex$(b << n)
+        n = 257: Debug.Print "plain  Byte    >> 257    " & Hex$(b >> n)
+        n = 65536: Debug.Print "plain  Integer << 65536  " & Hex$(i << n)
+        n = 65537: Debug.Print "plain  Integer >> 65537  " & Hex$(i >> n)
+        n = 65536: Debug.Print "plain  Long    << 65536  " & Hex$(l << n)
+        n = -1: Debug.Print "plain  Long    << -1     " & Hex$(l << n)
+        n = -1: Debug.Print "plain  Long    >> -1     " & Hex$(l >> n)
+    End Sub
+
+    [CompilerOptions("+llvm")]
+    Private Sub LlvmCases()
+        Dim b As Byte = &H81
+        Dim i As Integer = &H8001
+        Dim l As Long = &H80000001
+        Dim n As Long
+        n = 256: Debug.Print "LLVM   Byte    << 256    " & Hex$(b << n)
+        n = 257: Debug.Print "LLVM   Byte    >> 257    " & Hex$(b >> n)
+        n = 65536: Debug.Print "LLVM   Integer << 65536  " & Hex$(i << n)
+        n = 65537: Debug.Print "LLVM   Integer >> 65537  " & Hex$(i >> n)
+        n = 65536: Debug.Print "LLVM   Long    << 65536  " & Hex$(l << n)
+        n = -1: Debug.Print "LLVM   Long    << -1     " & Hex$(l << n)
+        n = -1: Debug.Print "LLVM   Long    >> -1     " & Hex$(l >> n)
+    End Sub
+
+    Public Sub Main()
+        PlainCases
+        LlvmCases
+    End Sub
+
+End Module
diff --git a/bugs/math-intrinsics-ignore-argument-names/math-intrinsics-ignore-argument-names.twinproj b/bugs/math-intrinsics-ignore-argument-names/math-intrinsics-ignore-argument-names.twinproj
new file mode 100644
index 0000000000000000000000000000000000000000..a8fa450d120d0e5d1de96848eab370c7587bbd47
GIT binary patch
literal 3390
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literal 0
HcmV?d00001

diff --git a/bugs/math-intrinsics-ignore-argument-names/repro.json b/bugs/math-intrinsics-ignore-argument-names/repro.json
new file mode 100644
index 000000000..cc4748aad
--- /dev/null
+++ b/bugs/math-intrinsics-ignore-argument-names/repro.json
@@ -0,0 +1,16 @@
+{
+  "mode": "run",
+  "expect": {
+    "exit": 0,
+    "output": [
+      "^positional\\s+23456781$",
+      "^named, in order\\s+23456781$",
+      "^named, swapped\\s+4000000$",
+      "^right, named, swapped\\s+400$",
+      "^unsigned, named, swapped\\s+0$",
+      "^unknown names\\s+23456781$",
+      "^ByteSwap, unknown name\\s+78563412$",
+      "^own function, swapped\\s+23456781$"
+    ]
+  }
+}
diff --git a/bugs/math-intrinsics-ignore-argument-names/src/Settings b/bugs/math-intrinsics-ignore-argument-names/src/Settings
new file mode 100644
index 000000000..362c75e5e
--- /dev/null
+++ b/bugs/math-intrinsics-ignore-argument-names/src/Settings
@@ -0,0 +1,61 @@
+{
+	"configuration.inherits": "Defaults",
+	"project.appTitle": "MathIntrinsicsIgnoreArgumentNames",
+	"project.buildPath": "${SourcePath}\\Build\\${ProjectName}_${Architecture}.${FileExtension}",
+	"project.buildType": "Standard EXE",
+	"project.description": "Reproduces: ShiftRotateLeft, ShiftRotateRight, ShiftUnsignedRight and ByteSwap ignore argument names and take their arguments by position",
+	"project.exportPathIsV2": true,
+	"project.id": "{22F9CD19-BE88-4EEF-BAA3-504F2AD9A16C}",
+	"project.name": "MathIntrinsicsIgnoreArgumentNames",
+	"project.optionExplicit": true,
+	"project.references": [
+		{
+			"id": "{00020430-0000-0000-C000-000000000046}",
+			"lcid": 0,
+			"name": "OLE Automation",
+			"path32": "C:\\Windows\\SysWOW64\\stdole2.tlb",
+			"path64": "C:\\Windows\\System32\\stdole2.tlb",
+			"symbolId": "stdole",
+			"versionMajor": 2,
+			"versionMinor": 0
+		},
+		{
+			"id": "{F50B82D0-DCAB-43FE-9631-11959D4A4728}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - VB Compatibility Package (Forms)",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "VB",
+			"versionBuild": 0,
+			"versionMajor": 0,
+			"versionMinor": 0,
+			"versionRevision": 31
+		},
+		{
+			"id": "{C192FB39-64CA-4D9B-B477-A5502F48EFCC}",
+			"isCompilerPackage": true,
+			"licence": "MIT",
+			"name": "[COMPILER PACKAGE] twinBASIC - App global class object",
+			"path32": "",
+			"path64": "",
+			"publisher": "TWINBASIC-COMPILER",
+			"symbolId": "AppGlobalClassProject",
+			"versionBuild": 0,
+			"versionMajor": 1,
+			"versionMinor": 0,
+			"versionRevision": 0
+		}
+	],
+	"project.settingsVersion": 1,
+	"project.startupObject": "Sub Main",
+	"project.warnings": {
+		"errors": [],
+		"hints": [],
+		"ignored": [],
+		"info": [],
+		"warnings": []
+	},
+	"runtime.useUnicodeStandardLibrary": true
+}
diff --git a/bugs/math-intrinsics-ignore-argument-names/src/Sources/Startup.twin b/bugs/math-intrinsics-ignore-argument-names/src/Sources/Startup.twin
new file mode 100644
index 000000000..122767302
--- /dev/null
+++ b/bugs/math-intrinsics-ignore-argument-names/src/Sources/Startup.twin
@@ -0,0 +1,21 @@
+' The shift, rotate and byte-swap intrinsics take their arguments by position and ignore the names given.
+Module Startup
+
+    Private Function Rotl(ByVal Number As Long, ByVal ShiftAmount As Long) As Long
+        Rotl = (Number << (ShiftAmount And 31)) Or ((Number >> (32 - (ShiftAmount And 31))) And ((1 << (ShiftAmount And 31)) - 1))
+    End Function
+
+    Public Sub Main()
+        Dim n As Long = &H12345678
+        Dim k As Long = 4
+        Debug.Print "positional                  " & Hex$(ShiftRotateLeft(n, k))
+        Debug.Print "named, in order             " & Hex$(ShiftRotateLeft(Number:=n, ShiftAmount:=k))
+        Debug.Print "named, swapped              " & Hex$(ShiftRotateLeft(ShiftAmount:=k, Number:=n))
+        Debug.Print "right, named, swapped       " & Hex$(ShiftRotateRight(ShiftAmount:=k, Number:=n))
+        Debug.Print "unsigned, named, swapped    " & Hex$(ShiftUnsignedRight(ShiftAmount:=k, Number:=n))
+        Debug.Print "unknown names               " & Hex$(ShiftRotateLeft(Foo:=n, Bar:=k))
+        Debug.Print "ByteSwap, unknown name      " & Hex$(ByteSwap(Foo:=n))
+        Debug.Print "own function, swapped       " & Hex$(Rotl(ShiftAmount:=k, Number:=n))
+    End Sub
+
+End Module
diff --git a/docs/LLVM/Getting-Started.md b/docs/LLVM/Getting-Started.md
index 4fc637166..2bef7e988 100644
--- a/docs/LLVM/Getting-Started.md
+++ b/docs/LLVM/Getting-Started.md
@@ -63,6 +63,9 @@ The main feature not yet supported is passing an error up to the calling procedu
 > [!WARNING]
 > In twinBASIC BETA 997, a **Double** addition, subtraction, multiplication or exponentiation (`^`) that overflows raises no error in code compiled with LLVM: the result is infinity (`1.#INF`), where the same code compiled without LLVM raises error 6, *Overflow*, as VB6 does. [**FloatingPointErrorChecks(True)**](../tB/Core/Attributes#floatingpointerrorchecks) does not change this. A **Double** division that overflows, and a division by zero, still raise their errors. After either, under `On Error Resume Next`, the variable that was to receive the result keeps its old value; without LLVM it holds infinity.
 
+> [!WARNING]
+> In twinBASIC BETA 997, code compiled with LLVM rounds a **Single** or **Double** that is exactly halfway between two integers away from zero when it converts the value to an integer type: in [**CLng**](../tB/Modules/Conversion/CLng), **CInt** and **CLngLng** of a variable, in an assignment to an **Integer** or **Long**, and in the operands of [**\\**](../tB/Core/IntegerDivide). With a **Double** variable holding 2.5, `CLng(x)` is 3, and with -0.5 it is -1. Without LLVM the value is rounded to the even integer, 2 and 0, as VB6 does. A constant expression such as `CLng(2.5)`, a **Variant** argument, and [**Round**](../tB/Modules/Math/Round), **Int** and **Fix** are not affected.
+
 Code compiled with LLVM ignores [**Debug.Assert**](../tB/Modules/Debug#assert): the statement does not stop, and its condition is not evaluated.
 
 All other language features should work, in both 32-bit and 64-bit builds. Please [report](../FAQ#bug-reporting) any crash that LLVM causes, and any message saying "a feature used in your code is not yet supported with the LLVM compiler".
diff --git a/docs/Reference/Core/Const.md b/docs/Reference/Core/Const.md
index 8868099b2..1d7510bf0 100644
--- a/docs/Reference/Core/Const.md
+++ b/docs/Reference/Core/Const.md
@@ -76,6 +76,19 @@ Debug.Print UBound(Primes)      ' 4
 Debug.Print Total               ' 28
 ```
 
+> [!WARNING]
+> In twinBASIC BETA 997, two forms of module-level array constant crash the compiler, whether or not the constant is used, and the project can then be neither compiled nor run:
+>
+> - an element that does not fit the element type, such as `Const Big() As Long = Array(2147483648)`;
+> - an element taken from another array constant, such as `Const Second() As Long = Array(Primes(0))`.
+
+> [!NOTE]
+> In twinBASIC BETA 997, array constants also have these defects, each reported as an error:
+>
+> - In a module, an array constant declared after a procedure is compile error **TB5079**, *Unrecognized symbol*, in the procedures that follow it. The procedures before it see an empty array: reading an element raises error 9. Declare array constants above the module's first procedure.
+> - A **Public** array constant in a class compiles, but code outside the class cannot reach it: the use is compile error **TB5027**. A **Public** scalar constant in a class is compile error **TB5250**.
+> - Passing a module-level array constant to a **ParamArray** parameter compiles without a diagnostic, and then fails with a *codegen error*.
+
 > [!NOTE]
 > Array constants are a twinBASIC extension. In VBA and VB6, `Const Primes() As Long = Array(2, 3)` is a syntax error.
 
diff --git a/docs/Reference/Core/LeftShift.md b/docs/Reference/Core/LeftShift.md
index 53031a3a6..22e42827b 100644
--- a/docs/Reference/Core/LeftShift.md
+++ b/docs/Reference/Core/LeftShift.md
@@ -41,6 +41,9 @@ An integer literal with no type suffix is an **Integer**, so `1 << 20` shifts a
 >
 > Convert such a value with [**CLng**](../Modules/Conversion/CLng) or [**CLngLng**](../Modules/Conversion/CLngLng) before shifting it.
 
+> [!WARNING]
+> In twinBASIC BETA 997, code compiled with LLVM cuts the shift count to the size of the shifted **Byte** or **Integer** before shifting: for a **Byte**, a count of 256 becomes 0 and 257 becomes 1. So a **Byte** shifted by 256 is unchanged, where the result should be 0, as it is without LLVM. An **Integer** shifted by 65,536 or more behaves the same way. A **Long** or **LongLong** is not affected.
+
 ### Compound assignment
 
 `x <<= n` is the twinBASIC shorthand for `x = x << n`. **\<<=** is a statement, not an expression --- it does not produce a value.
diff --git a/docs/Reference/Core/RightShift.md b/docs/Reference/Core/RightShift.md
index 8d136af4f..d79472db5 100644
--- a/docs/Reference/Core/RightShift.md
+++ b/docs/Reference/Core/RightShift.md
@@ -39,6 +39,9 @@ The data type of *result* matches the type of *number*, whatever the type of *co
 >
 > Convert such a value with [**CLng**](../Modules/Conversion/CLng) or [**CLngLng**](../Modules/Conversion/CLngLng) before shifting it.
 
+> [!WARNING]
+> In twinBASIC BETA 997, code compiled with LLVM cuts the shift count to the size of the shifted **Byte** or **Integer** before shifting: for a **Byte**, a count of 256 becomes 0 and 257 becomes 1. So a **Byte** shifted by 256 is unchanged, where the result should be 0, as it is without LLVM. An **Integer** shifted by 65,536 or more behaves the same way. A **Long** or **LongLong** is not affected.
+
 ### Compound assignment
 
 `x >>= n` is the twinBASIC shorthand for `x = x >> n`. **\>>=** is a statement, not an expression --- it does not produce a value.
diff --git a/docs/Reference/Default/VBA/Math/ShiftRotateLeft.md b/docs/Reference/Default/VBA/Math/ShiftRotateLeft.md
index eed1a0a96..bcaf46cea 100644
--- a/docs/Reference/Default/VBA/Math/ShiftRotateLeft.md
+++ b/docs/Reference/Default/VBA/Math/ShiftRotateLeft.md
@@ -24,6 +24,9 @@ Unlike the [**\<<**](../../Core/LeftShift) operator, which discards the bits shi
 
 With constant arguments, the call is evaluated when the code is compiled, so it can be used in a [**Const**](../../Core/Const) declaration, an **Enum** member's value or a **Case** expression.
 
+> [!WARNING]
+> In twinBASIC BETA 997, **ShiftRotateLeft** ignores the names of named arguments and takes its arguments in the order they are written: `ShiftRotateLeft(ShiftAmount:=4, Number:=&H12345678)` rotates 4 left by `&H12345678` bits, and gives the **Integer** `&H400`. Write the arguments by position, *number* first.
+
 > [!NOTE]
 > **ShiftRotateLeft** is a twinBASIC extension. VBA and VB6 have no function of this name: a call to it is the compile error *Sub or Function not defined*.
 
diff --git a/docs/Reference/Default/VBA/Math/ShiftRotateRight.md b/docs/Reference/Default/VBA/Math/ShiftRotateRight.md
index 81c6d5b59..4dfd0ea0e 100644
--- a/docs/Reference/Default/VBA/Math/ShiftRotateRight.md
+++ b/docs/Reference/Default/VBA/Math/ShiftRotateRight.md
@@ -24,6 +24,9 @@ Unlike the [**\>>**](../../Core/RightShift) operator, which discards the bits sh
 
 With constant arguments, the call is evaluated when the code is compiled, so it can be used in a [**Const**](../../Core/Const) declaration, an **Enum** member's value or a **Case** expression.
 
+> [!WARNING]
+> In twinBASIC BETA 997, **ShiftRotateRight** ignores the names of named arguments and takes its arguments in the order they are written: `ShiftRotateRight(ShiftAmount:=4, Number:=&H12345678)` rotates 4 right by `&H12345678` bits. Write the arguments by position, *number* first.
+
 > [!NOTE]
 > **ShiftRotateRight** is a twinBASIC extension. VBA and VB6 have no function of this name: a call to it is the compile error *Sub or Function not defined*.
 
diff --git a/docs/Reference/Default/VBA/Math/ShiftUnsignedRight.md b/docs/Reference/Default/VBA/Math/ShiftUnsignedRight.md
index 48e4332fe..d6f2b6844 100644
--- a/docs/Reference/Default/VBA/Math/ShiftUnsignedRight.md
+++ b/docs/Reference/Default/VBA/Math/ShiftUnsignedRight.md
@@ -24,6 +24,9 @@ A shift by as many bits as the type holds, or more, gives 0. A negative *shiftam
 
 With constant arguments, the call is evaluated when the code is compiled, so it can be used in a [**Const**](../../Core/Const) declaration, an **Enum** member's value or a **Case** expression.
 
+> [!WARNING]
+> In twinBASIC BETA 997, **ShiftUnsignedRight** ignores the names of named arguments and takes its arguments in the order they are written: `ShiftUnsignedRight(ShiftAmount:=4, Number:=&H12345678)` shifts 4 right by `&H12345678` bits, and gives 0. Write the arguments by position, *number* first.
+
 > [!NOTE]
 > **ShiftUnsignedRight** is a twinBASIC extension. VBA and VB6 have no function of this name: a call to it is the compile error *Sub or Function not defined*.