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Rust: Fix some false positives for rust/unused-variable and rust/unused-value #21009

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Rust: Fix some false positives for rust/unused-variable and rust/unused-value #21009

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c160a1f
Rust: Fix common FPs for rust/unused-variable and rust/unused-value.
geoffw0 Dec 10, 2025
6ca90a2
Rust: Change note.
geoffw0 Dec 10, 2025
f1d241f
Rust: Accept test change.
geoffw0 Dec 10, 2025
d88bae9
Rust: Narrow the exclusion a little.
geoffw0 Dec 11, 2025
ee13a49
Merge branch 'main' into varfps
geoffw0 Dec 11, 2025
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4 changes: 4 additions & 0 deletions rust/ql/src/change-notes/2025-12-10-unused-variable.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
---
category: minorAnalysis
---
* Fixed common false positives for the `rust/unused-variable` and `rust/unused-value` queries.
6 changes: 6 additions & 0 deletions rust/ql/src/queries/unusedentities/UnusedVariable.qll
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Expand Up @@ -43,4 +43,10 @@ predicate isAllowableUnused(Variable v) {
or
// a 'self' variable
v.getText() = "self"
or
// a common source of false positives is match arms containing constants
// (typically beginning with a capital letter) that are misrecognized as a
// variable, having not been correctly resolved.
v.getPat().getParentNode() instanceof MatchArm and
v.getText().charAt(0).isUppercase()
}
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