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`_is_variadic` is the sole suppressor of a TOO_MANY arity verdict, and it is consulted only in the branch where a site passes more POSITIONAL arguments than the callee declares. Counting `kwonlyargs` as variadic suppressed that verdict for `def helper(a, *, b=1)`, which absorbs nothing: CPython rejects `helper(1, 2, b=3)` with "takes 1 positional argument but 2 positional arguments ... were given". `test_extra_positional_to_a_keyword_only_callee_is_too_many` caught it, reddening every layer of the 1548/1549/1550 stacks on all platforms. The test's own oracle read `vararg is not None or kwonlyargs` -- the exact expression under test -- so the keyword-only case compared the bug against itself and passed. It now decides by CALLING the function with one surplus positional, so it cannot agree with a buggy implementation. Renamed to `_header_absorbs_extra_positionals` / `_absorbs_extra_positionals` after the question actually asked, and dropped the regex the parser replaced along with its now-unused `re` import.
Review P2: the module docstring and one test name still said `_is_variadic`, which no longer exists, and the wrapper docstring still said "variadic" for what is specifically absorbing extra positionals.
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📝 WalkthroughWalkthroughThe arity helpers now recognize only ChangesSurplus Positional Arity Detection
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Merge Risk: 🔵 Low · up to Valid multiline function signatures containing a closing parenthesis in a string or comment can be incorrectly reported as receiving too many positional arguments. Add lexical-aware scanning before merging. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Copilot review overview
🟡 Changes recommended
_absorbs_extra_positionals can still truncate multi-line Python signatures at a ) inside a default expression, producing incorrect false-negative results for *args detection.
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Review effort: Lite
Findings: 1
What changed in this PR
This PR fixes arity analysis for Python call sites by ensuring that only *args (not keyword-only parameters) suppresses “too many positional arguments” verdicts, aligning structural-delta behavior with CPython and unblocking failing test stacks.
Changes:
- Rename the internal helper to reflect its real purpose (
_header_absorbs_extra_positionals/_absorbs_extra_positionals) and change the logic so onlyvarargsuppresses surplus positional arity verdicts. - Strengthen the test oracle by executing headers and calling the function with a surplus positional to match CPython runtime behavior, and add explicit regression coverage for keyword-only headers.
- Remove the now-unused regex-based variadic detection and its
reimport.
| File | Description |
|---|---|
codebase_rag/structural_delta.py |
Updates suppression logic for “too many positional args” to depend solely on *args, and renames helpers accordingly. |
codebase_rag/tests/test_variadic_header_detection.py |
Reworks the oracle to validate behavior via actual runtime calls and adds regression tests for keyword-only headers. |
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Copilot's finding is correct and is now fixed. The claim: def f(
a=g(),
*rest,
):cut after It is pre-existing rather than introduced here — my diff never touched the The loop now stops where the parameter list actually closes, by counting
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Copilot's finding on this PR, verified: the read-back loop stopped at the
first line containing `)`, so
def f(
a=g(),
*rest,
):
was cut after `a=g(),`. That fragment does not parse, the helper answers
False, and a genuine `*rest` callee is reported as receiving too many
arguments.
Pre-existing rather than introduced here -- the loop is untouched by this
PR -- but it falsifies a claim the function's own docstring makes: "a real
`*rest` can follow a default that itself contains a `)` -- which the old
first-`)` cut discarded". e5d3bf0 fixed the PARSING with ast; the
truncation happens before the parser sees the text, so the defect survived
the fix meant to remove it.
The loop now stops where brackets balance. An unbalanced count reads on to
`end_line`, the safe direction.
test_a_multiline_header_is_not_cut_at_a_paren_in_a_default drives
`_absorbs_extra_positionals` against a real file, not the string helper:
the truncation lives in the line loop, and a test of the helper alone
stayed green with the loop broken. Reverting the cut to `if ")" in line`
reddens it.
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Actionable comments posted: 1
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Inline comments:
In `@codebase_rag/structural_delta.py`:
- Around line 604-607: Update _closes_the_parameter_list to ignore closing
delimiters occurring inside string literals or comments, preserving lexical
state across multiline headers; ensure _absorbs_extra_positionals receives the
complete header so variadic callees are not incorrectly reported by
_arity_verdict as DELTA_ARITY_TOO_MANY. Add regression coverage for both a
string and a comment containing “)” before *rest.
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codebase_rag/structural_delta.pycodebase_rag/tests/test_variadic_header_detection.py
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Copilot review overview
Review effort: Lite
Findings: 3
…eable The header cut counted raw characters, so a bracket inside a string or comment (a=")", # )) ended the parameter list early and dropped a *rest that followed; it also re-joined and rescanned the header per line. One tokenize pass now finds the closing row, ignoring strings and comments. A one-line definition (def f(a, *rest): return a) already carries its suite, and the appended stand-in pass made it unparseable; the bare header is now parsed first and pass is added only when it is needed.
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Closing as superseded: this is part of the split of #1550, which was closed without merging, and it targets the stale Generated by Claude Code |
test_extra_positional_to_a_keyword_only_callee_is_too_manyis red on everyplatform across three
pr-splitstacks (#2044, #2057, #2062, #2074 and thelayers above them). They inherit it from this branch; none of those PRs
touches arity code.
Cause
_is_variadicis the sole suppressor of aDELTA_ARITY_TOO_MANYverdict,and
_arity_verdictconsults it in exactly one place: the branch where acall site passes more positional arguments than the callee declares.
e5d3bf09rewrote the header check to parse rather than scan — correct initself — but widened the answer to
vararg is not None or kwonlyargs.Keyword-only parameters absorb nothing:
So
def helper(a, *, b=1)suppressed a verdict for a call that raises atruntime. Only
*argsbelongs in that branch.The test agreed with the bug
The oracle in
test_variadic_header_detection.pyreadwhich is the expression under test, so
test_it_agrees_with_python[bare-star-keyword-only]compared the implementation against a restatement of itself and passed. It
now decides by calling the function with one surplus positional, so it
cannot agree with a broken implementation. Replaying the old expression
against the new oracle reddens exactly the two keyword-only headers.
Changes
vararg is not Nonealone suppresses;kwonlyargsno longer does._header_absorbs_extra_positionals/_absorbs_extra_positionalsafter the question actually asked.
test_keyword_only_params_do_not_absorb_an_extra_positional,and a
bare-star-defaulted-keyword-onlycase._VARIADICregex the parser replaced, and its now-unusedimport re.Verification
16 passedby name, including the previously failingtest_extra_positional_to_a_keyword_only_callee_is_too_many;58 passedacross both files. The helper now matches CPython on all 11 header shapes
tested; the old one was wrong on 2.
*argssuppression is unchanged,including
def f(a, *rest, k=1).Summary by CodeRabbit
*args) allow surplus positional inputs.