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compiler and language documentation disagree on lifetime extension for array expressions

A-arrayArea: `[T; N]` Area: `[T; N]`

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

A-temporary-lifetime-extensionArea: temporary lifetime extension Area: temporary lifetime extension

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

I-lang-nominatedNominated for discussion during a lang team meeting. Nominated for discussion during a lang team meeting.

P-lang-drag-1Lang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang Lang team prioritization drag level 1. https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang

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 team Relevant to the language team

T-lang-docsRelevant to the lang-docs team. Relevant to the lang-docs team.

Status: Open.

#146092 In rust-lang/rust;

· dianne opened on Sep 1, 2025

Program crash in vector initialization: crash in extend_with

A-arrayArea: `[T; N]` Area: `[T; N]`

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.

#146033 In rust-lang/rust;

· hfiguiere opened on Aug 30, 2025

<code>[expr; 0]</code> ignores lifetimes

A-arrayArea: `[T; N]` Area: `[T; N]`

A-lifetimesArea: Lifetimes / regions Area: Lifetimes / regions

A-ZSTArea: Zero-sized types (ZSTs). Area: Zero-sized types (ZSTs).

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-typesRelevant to the types team, which will review and decide on the PR/issue. Relevant to the types team, which will review and decide on the PR/issue.

Status: Open.

#144045 In rust-lang/rust;

· theemathas opened on Jul 17, 2025

Unsize-coercible type causes <code>[SOME_CONST; 0]</code> to execute <code>Drop</code>, but only if type is annotated.

A-arrayArea: `[T; N]` Area: `[T; N]`

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-ZSTArea: Zero-sized types (ZSTs). Area: Zero-sized types (ZSTs).

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

F-derive_coerce_pointeeFeature: RFC 3621's oft-renamed implementation Feature: RFC 3621's oft-renamed implementation

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-typesRelevant to the types team, which will review and decide on the PR/issue. Relevant to the types team, which will review and decide on the PR/issue.

Status: Open.

#143671 In rust-lang/rust;

· theemathas opened on Jul 9, 2025

Type inference of inferred repeat expr counts is not as strong as it could be

A-arrayArea: `[T; N]` Area: `[T; N]`

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

F-generic_arg_inferUsing `_` as a const argument: #![feature(generic_arg_infer)]` Using `_` as a const argument: #![feature(generic_arg_infer)]`

F-marker_trait_attr`#![feature(marker_trait_attr)]` `#![feature(marker_trait_attr)]`

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-typesRelevant to the types team, which will review and decide on the PR/issue. Relevant to the types team, which will review and decide on the PR/issue.

Status: Open.

#140855 In rust-lang/rust;

· BoxyUwU opened on May 9, 2025

Compile error when directly using <code>&amp;mut</code> in explicity const context

A-arrayArea: `[T; N]` Area: `[T; N]`

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

A-constant-promotionArea: constant promotion Area: constant promotion

A-ZSTArea: Zero-sized types (ZSTs). Area: Zero-sized types (ZSTs).

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.

#140126 In rust-lang/rust;

· RedRam567 opened on Apr 21, 2025

ICE <code>error performing operation: fully_perform</code>

A-arrayArea: `[T; N]` Area: `[T; N]`

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

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

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

S-bug-has-testStatus: This bug is tracked inside the repo by a `known-bug` test. Status: This bug is tracked inside the repo by a `known-bug` test.

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

#140123 In rust-lang/rust;

· RedRam567 opened on Apr 21, 2025

Large amount of generated code for match statements with large arrays

A-arrayArea: `[T; N]` Area: `[T; N]`

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

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

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

I-heavyIssue: Problems and improvements with respect to binary size of generated code. Issue: Problems and improvements with respect to binary size 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.

#110870 In rust-lang/rust;

· alex opened on Apr 26, 2023

Rust produces unlinkable code when writing large arrays

A-arrayArea: `[T; N]` Area: `[T; N]`

A-linkageArea: linking into static, shared libraries and binaries Area: linking into static, shared libraries and binaries

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.

#108566 In rust-lang/rust;

· msrd0 opened on Feb 28, 2023

Unsafe block does not propagate into array length

A-arrayArea: `[T; N]` Area: `[T; N]`

Status: Open.

#105204 In rust-lang/rust;

· RalfJung opened on Dec 3, 2022

Suggest <code>.try_into().unwrap()</code> or <code>as _</code> for const parameters of the wrong type (e.g., in array types) if applicable and possible on stable

A-arrayArea: `[T; N]` Area: `[T; N]`

A-const-genericsArea: const generics (parameters and arguments) Area: const generics (parameters and arguments)

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

D-lack-of-suggestionDiagnostics: Adding a (structured) suggestion would increase the quality of the diagnostic. Diagnostics: Adding a (structured) suggestion would increase the quality of the diagnostic.

D-terseDiagnostics: An error or lint that doesn't give enough information about the problem at hand. Diagnostics: An error or lint that doesn't give enough information about the problem at hand.

S-blockedStatus: Blocked on something else such as an RFC or other implementation work. Status: Blocked on something else such as an RFC or other implementation work.

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.

#104949 In rust-lang/rust;

· scvalex opened on Nov 26, 2022

Provide structural pinning guarantees for slices, vecs, arrays

A-arrayArea: `[T; N]` Area: `[T; N]`

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

Status: Open.

#104108 In rust-lang/rust;

· yoshuawuyts opened on Nov 7, 2022