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nightly <code>unused_assignments</code> false positives for <code>miette::Diagnostic</code> fields

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

E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example

L-unused_assignmentsLint: unused_assignmentsLint: unused_assignments

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.

P-mediumMedium priorityMedium priority

regression-from-stable-to-nightlyPerformance or correctness regression from stable to nightly.Performance or correctness regression from stable to nightly.

Status: Open.

#147648 In rust-lang/rust;

· adr1anh opened on Oct 13, 2025

<code>unused_assignment</code> triggered by closure even though value is used

A-closuresArea: Closures (`|…| { … }`)Area: Closures (`|…| { … }`)

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.

D-imprecise-spansDiagnostics: spans don't point to exactly the erroneous codeDiagnostics: spans don't point to exactly the erroneous code

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.

#141615 In rust-lang/rust;

· BennoLossin opened on May 26, 2025

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

unused_assignments warning: false negative for dead stores in struct fields

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-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.

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.

#49256 In rust-lang/rust;

· matthiaskrgr opened on Mar 22, 2018

Unused assignment warning should trigger for structs

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-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.

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.

#16789 In rust-lang/rust;

· crumblingstatue opened on Aug 27, 2014