Rust: Make path resolution robust against invalid code with conflicting declarations#21311
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hvitved wants to merge 1 commit intogithub:mainfrom
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Rust: Make path resolution robust against invalid code with conflicting declarations#21311hvitved wants to merge 1 commit intogithub:mainfrom
hvitved wants to merge 1 commit intogithub:mainfrom
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Pull request overview
Improves Rust path resolution to remain performant and deterministic in the presence of invalid Rust code that introduces conflicting declarations (e.g., duplicate names), and adds a regression test covering that scenario.
Changes:
- Add an invalid-Rust test case with conflicting
struct Adeclarations and disablecargo checkfor that fixture. - Update path resolution to avoid combinatorial blow-ups in invalid code by selecting a single (last) matching child item.
- Update expected test output to reflect the new resolution behavior for the invalid fixture.
Reviewed changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
| rust/ql/lib/codeql/rust/internal/PathResolution.qll | Adjusts child-successor selection to be robust in invalid/conflicting-declaration scenarios. |
| rust/ql/test/library-tests/path-resolution/invalid/main.rs | Adds an invalid Rust fixture with conflicting declarations. |
| rust/ql/test/library-tests/path-resolution/invalid/options.yml | Disables cargo checking for the invalid fixture. |
| rust/ql/test/library-tests/path-resolution/path-resolution.expected | Updates expected results for the new invalid-code path resolution behavior. |
Comments suppressed due to low confidence (1)
rust/ql/test/library-tests/path-resolution/invalid/main.rs:6
- Typo in comment: “precendence” should be “precedence”.
fn f(x: A) {} // $ item=A2 (the later occurence takes precendence)
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Fixes performance on
edl-lang/edl, which contains e.g. https://github.com/edl-lang/edl/blob/main/tests/ui/impl-trait/impl-trait-plus-priority.rs.DCA looks good; a modest performance improvement and slight decrease in inconstencies.