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Should a <code>[..]</code> slice pattern constitute a discriminant read

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

A-slice-patternsArea: Slice patterns, https://github.com/rust-lang/rust/issues/23121Area: Slice patterns, https://github.com/rust-lang/rust/issues/23121

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

I-lang-radarItems that are on lang's radar and will need eventual work or consideration.Items that are on lang's radar and will need eventual work or consideration.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#141825 In rust-lang/rust;

· meithecatte opened on May 31, 2025

Poor suggestion for <code>async || {}</code> in place of <code>async {}</code>

A-async-awaitArea: Async & AwaitArea: Async & Await

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

#140265 In rust-lang/rust;

· meithecatte opened on Apr 24, 2025

"cannot assign in match guard" error message only triggers if the pattern doesn't bind anything

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

#137690 In rust-lang/rust;

· meithecatte opened on Feb 26, 2025

FakeReads create inconsistent results with equivalent examples involving partial moves

A-docsArea: Documentation for any part of the project, including the compiler, standard library, and toolsArea: Documentation for any part of the project, including the compiler, standard library, and tools

A-MIRArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.htmlArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html

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

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.

#137677 In rust-lang/rust;

· meithecatte opened on Feb 26, 2025

Closure captures are inconsistent between <code>x</code> and <code>x @ _</code> irrefutable patterns

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

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

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.

#137553 In rust-lang/rust;

· meithecatte opened on Feb 24, 2025

Lifetime issues caused by implicitly choosing the wrong implementation of Borrow are incomprehensible

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

#136793 In rust-lang/rust;

· meithecatte opened on Feb 9, 2025

Obtuse diagnostic: overflow evaluating the requirement <code>&amp;_ well-formed</code>

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

#128397 In rust-lang/rust;

· meithecatte opened on Jul 30, 2024

Provide a better error when code is put outside of a function

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

#92615 In rust-lang/rust;

· meithecatte opened on Jan 6, 2022

Suggest removing <code>let</code> when unused variable shadows another variable

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.

A-resolveArea: Name/path resolution done by `rustc_resolve` specificallyArea: Name/path resolution done by `rustc_resolve` specifically

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

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.

#84664 In rust-lang/rust;

· meithecatte opened on Apr 28, 2021

inaccurate const drop error doesn't mention #![feature(const_precise_live_drops)]

A-const-evalArea: Constant evaluation, covers all const contexts (static, const fn, ...)Area: Constant evaluation, covers all const contexts (static, const fn, ...)

A-destructorsArea: Destructors (`Drop`, …)Area: Destructors (`Drop`, …)

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

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

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.

#79166 In rust-lang/rust;

· meithecatte opened on Nov 18, 2020

Diagnostics: suggest adding lifetime to trait object stored in struct

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

A-dyn-traitArea: trait objects, vtable layoutArea: trait objects, vtable layout

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

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

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

D-newcomer-roadblockDiagnostics: Confusing error or lint; hard to understand for new users.Diagnostics: Confusing error or lint; hard to understand for new users.

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.

#78547 In rust-lang/rust;

· meithecatte opened on Oct 29, 2020

Clever recursive types + deref = seemingly infinite compile time

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.

I-hangIssue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.

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.

#67064 In rust-lang/rust;

· meithecatte opened on Dec 5, 2019