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unused_parens generates invalid code

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

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.

D-invalid-suggestionDiagnostics: A structured suggestion resulting in incorrect code.Diagnostics: A structured suggestion resulting in incorrect code.

L-unused_parensLint: unused_parensLint: unused_parens

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

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.

#144378 In rust-lang/rust;

· benStre opened on Jul 16, 2025

false positive <code>unused_parens</code> causes syntax error around labled loops with ifs

A-suggestion-diagnosticsArea: Suggestions generated by the compiler applied by `cargo fix`Area: Suggestions generated by the compiler applied by `cargo fix`

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

D-invalid-suggestionDiagnostics: A structured suggestion resulting in incorrect code.Diagnostics: A structured suggestion resulting in incorrect code.

L-unused_parensLint: unused_parensLint: unused_parens

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.

#143256 In rust-lang/rust;

· matthiaskrgr opened on Jun 30, 2025

<code>unused_parens</code> false positive in return position of <code>Fn</code> generics, when there is another path segment

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.

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

L-unused_parensLint: unused_parensLint: unused_parens

P-lowLow priorityLow priority

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.

#143080 In rust-lang/rust;

· sodiboo opened on Jun 27, 2025

False-positive <code>unused_parens</code> missing macro cases

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, ..)

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

L-unused_parensLint: unused_parensLint: unused_parens

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.

#138234 In rust-lang/rust;

· MultisampledNight opened on Mar 8, 2025

Inappropriate <code>unused_parens</code> for inline <code>const</code> inside <code>vec!</code>/macros

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.

D-incorrectDiagnostics: A diagnostic that is giving misleading or incorrect information.Diagnostics: A diagnostic that is giving misleading or incorrect information.

F-inline_constInline constants (aka: const blocks, const expressions, anonymous constants)Inline constants (aka: const blocks, const expressions, anonymous constants)

L-unused_parensLint: unused_parensLint: unused_parens

S-has-mcveStatus: A Minimal Complete and Verifiable Example has been found for this issueStatus: A Minimal Complete and Verifiable Example has been found for this issue

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.

#126457 In rust-lang/rust;

· Zalathar opened on Jun 14, 2024

<code>(..=0 | 2)</code> in macro does not compile without parentheses but generates warning for unnecessary parentheses

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, ..)

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

A-suggestion-diagnosticsArea: Suggestions generated by the compiler applied by `cargo fix`Area: Suggestions generated by the compiler applied by `cargo fix`

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

D-invalid-suggestionDiagnostics: A structured suggestion resulting in incorrect code.Diagnostics: A structured suggestion resulting in incorrect code.

L-unused_parensLint: unused_parensLint: unused_parens

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.

#120737 In rust-lang/rust;

· astra90x opened on Feb 7, 2024

<code>unused_parens</code> false positives and false negatives in code containing macro calls

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.

L-unused_parensLint: unused_parensLint: unused_parens

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.

#119426 In rust-lang/rust;

· dtolnay opened on Dec 30, 2023

Some unused_parens suggestions can result in keyword soup (even if technically correct).

A-control-flowArea: Control flowArea: Control flow

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.

L-unused_parensLint: unused_parensLint: unused_parens

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#114161 In rust-lang/rust;

· eddyb opened on Jul 28, 2023

Wrong "unnecessary parentheses around function argument"-warning with macro in assignment and return positions

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.

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

L-unused_parensLint: unused_parensLint: unused_parens

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.

#113563 In rust-lang/rust;

· Phlosioneer opened on Jul 11, 2023

<code>unused_parens</code>: False positive on parenthesized type-relative paths that would otherwise be interpreted as the start of a generic param list (<code>impl&lt;T&gt;</code>, <code>for&lt;T&gt;</code>, <code>where&lt;T&gt;</code>)

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

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

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

L-unused_parensLint: unused_parensLint: unused_parens

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.

#107235 In rust-lang/rust;

· kadiwa4 opened on Jan 23, 2023

<code>unnecessary parentheses around type</code> in attribute macro

A-attributesArea: Attributes (`#[…]`, `#![…]`)Area: Attributes (`#[…]`, `#![…]`)

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.

A-proc-macrosArea: Procedural macrosArea: Procedural macros

D-invalid-suggestionDiagnostics: A structured suggestion resulting in incorrect code.Diagnostics: A structured suggestion resulting in incorrect code.

D-papercutDiagnostics: An error or lint that needs small tweaks.Diagnostics: An error or lint that needs small tweaks.

L-unused_parensLint: unused_parensLint: unused_parens

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.

#106939 In rust-lang/rust;

· lesurp opened on Jan 16, 2023

Incorrect <code>unnecessary parenthesis</code> inside attribute parameters

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

L-unused_parensLint: unused_parensLint: unused_parens

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.

#104457 In rust-lang/rust;

· akrieger opened on Nov 15, 2022