Removes fragile tests which depend on rustc output

[martynp]

No description provided.

[Copilot]

Pull request overview

This PR removes a set of codegen UI compile-fail tests that primarily asserted rustc’s own type-error diagnostics (which are prone to churn across toolchain updates), and updates remaining UI snapshot outputs to align with current compiler formatting.

Changes:

• Removed several ui-fail / ui-fail-{stable,nightly} tests (and associated .stderr snapshots) that depended on unstable rustc type-error output.
• Updated multiple remaining ui-fail-stable .stderr snapshots to match current diagnostic spans/formatting.
• Documented the removal in the Unreleased section of CHANGELOG.md.

Reviewed changes

Copilot reviewed 43 out of 43 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
core/codegen/tests/ui-fail/uri_display_type_errors.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail/typed-uri-bad-type.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail/route-type-errors.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail/responder-types.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail/from_form_type_errors.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail/catch_type_errors.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail-stable/uri_display.stderr	Updated expected diagnostic output formatting/spans.
core/codegen/tests/ui-fail-stable/uri_display_type_errors.stderr	Removed snapshot for deleted brittle test.
core/codegen/tests/ui-fail-stable/uri_display_type_errors.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail-stable/typed-uris-invalid-syntax.stderr	Updated expected diagnostic output formatting/spans.
core/codegen/tests/ui-fail-stable/typed-uris-bad-params.stderr	Updated expected diagnostic output formatting/spans.
core/codegen/tests/ui-fail-stable/typed-uri-bad-type.stderr	Removed snapshot for deleted brittle test.
core/codegen/tests/ui-fail-stable/typed-uri-bad-type.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail-stable/route-type-errors.stderr	Removed snapshot for deleted brittle test.
core/codegen/tests/ui-fail-stable/route-type-errors.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail-stable/route-path-bad-syntax.stderr	Updated expected diagnostic output formatting/spans.
core/codegen/tests/ui-fail-stable/route-attribute-general-syntax.stderr	Updated expected diagnostic output formatting/spans.
core/codegen/tests/ui-fail-stable/responder.stderr	Updated expected diagnostic output formatting/spans.
core/codegen/tests/ui-fail-stable/responder-types.stderr	Removed snapshot for deleted brittle test.
core/codegen/tests/ui-fail-stable/responder-types.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail-stable/from_param.stderr	Updated expected diagnostic output formatting/spans.
core/codegen/tests/ui-fail-stable/from_form.stderr	Updated expected diagnostic output formatting/spans.
core/codegen/tests/ui-fail-stable/from_form_type_errors.stderr	Removed snapshot for deleted brittle test.
core/codegen/tests/ui-fail-stable/from_form_type_errors.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail-stable/from_form_field.stderr	Updated expected diagnostic output formatting/spans.
core/codegen/tests/ui-fail-stable/catch_type_errors.stderr	Removed snapshot for deleted brittle test.
core/codegen/tests/ui-fail-stable/catch_type_errors.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail-stable/bad-ignored-segments.stderr	Updated expected diagnostic output formatting/spans.
core/codegen/tests/ui-fail-stable/async-entry.stderr	Updated expected diagnostic output formatting/spans.
core/codegen/tests/ui-fail-nightly/uri_display_type_errors.stderr	Removed snapshot for deleted brittle test.
core/codegen/tests/ui-fail-nightly/uri_display_type_errors.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail-nightly/typed-uri-bad-type.stderr	Removed snapshot for deleted brittle test.
core/codegen/tests/ui-fail-nightly/typed-uri-bad-type.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail-nightly/route-type-errors.stderr	Removed snapshot for deleted brittle test.
core/codegen/tests/ui-fail-nightly/route-type-errors.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail-nightly/responder-types.stderr	Removed snapshot for deleted brittle test.
core/codegen/tests/ui-fail-nightly/responder-types.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail-nightly/from_form.stderr	Updated expected diagnostic output formatting/spans.
core/codegen/tests/ui-fail-nightly/from_form_type_errors.stderr	Removed snapshot for deleted brittle test.
core/codegen/tests/ui-fail-nightly/from_form_type_errors.rs	Removed brittle UI test case.
core/codegen/tests/ui-fail-nightly/catch_type_errors.stderr	Removed snapshot for deleted brittle test.
core/codegen/tests/ui-fail-nightly/catch_type_errors.rs	Removed brittle UI test case.
CHANGELOG.md	Documented removal of brittle UI tests under Unreleased.

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