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unused_assignments lint has trouble tracking that one match guard observes assignment from another match guard.

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

A-patternsRelating to patterns and pattern matchingRelating to patterns and pattern matching

C-bugCategory: This is a bug.Category: This is a bug.

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

L-false-positiveLint: False positive (should not have fired).Lint: False positive (should not have fired).

L-unused_assignmentsLint: unused_assignmentsLint: unused_assignments

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#138069 In rust-lang/rust;

· pnkfelix opened on Mar 5, 2025

Multiple incompatible clashing extern fn's should be a hard error (potentially phased in via future-incompat)

A-FFIArea: Foreign function interface (FFI)Area: Foreign function interface (FFI)

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

C-bugCategory: This is a bug.Category: This is a bug.

C-future-incompatibilityCategory: Future-incompatibility lintsCategory: Future-incompatibility lints

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#105146 In rust-lang/rust;

· pnkfelix opened on Dec 1, 2022

coercions perf benchmark regressed by 3% to 14% after bidi lint addition

A-frontendArea: Compiler frontend (errors, parsing and HIR)Area: Compiler frontend (errors, parsing and HIR)

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

A-parserArea: The lexing & parsing of Rust source code to an ASTArea: The lexing & parsing of Rust source code to an AST

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#90514 In rust-lang/rust;

· pnkfelix opened on Nov 2, 2021

Lint for <code>&amp;String::into(): String</code> on final use of input string

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#61994 In rust-lang/rust;

· pnkfelix opened on Jun 20, 2019

type alias incorrectly flagged as unused when solely used in impl header

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#58593 In rust-lang/rust;

· pnkfelix opened on Feb 20, 2019

unused_must_use lint after <code>write!</code> fails to note its origin

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#54288 In rust-lang/rust;

· pnkfelix opened on Sep 17, 2018

An unused generic parameter should be a warning at the definition site.

A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lints

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

C-feature-requestCategory: A feature request, i.e: not implemented / a PR.Category: A feature request, i.e: not implemented / a PR.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#34396 In rust-lang/rust;

· pnkfelix opened on Jun 21, 2016

dead code (+ unused assignment, etc) warnings in macros do more harm than good

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

C-bugCategory: This is a bug.Category: This is a bug.

P-lowLow priorityLow priority

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#24580 In rust-lang/rust;

· pnkfelix opened on Apr 18, 2015