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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

Tracking issue for release notes of #74985: Tracking Issue for slice::array_chunks

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

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

A-sliceArea: `[T]`Area: `[T]`

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.

relnotesMarks issues that should be documented in the release notes of the next release.Marks issues that should be documented in the release notes of the next release.

relnotes-tracking-issueMarks issues tracking what text to put in release notes.Marks issues tracking what text to put in release notes.

T-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.Relevant to the library API team, which will review and decide on the PR/issue.

Status: Open.

#139693 In rust-lang/rust;

· rustbot opened on Apr 11, 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.htmlArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html

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

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

[ER] Sub-optimal allocation of simple zeroed Vec of arrays

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

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

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.

#104847 In rust-lang/rust;

· leonardo-m opened on Nov 24, 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 toolsArea: 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

core::array::from_fn segfaults (v1.64, v1.63)

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

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

Status: Open.

#103756 In rust-lang/rust;

· mvniekerk opened on Oct 30, 2022

transitive coercion to slice doesn't work for arrays

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

A-coercionsArea: implicit and explicit `expr as Type` coercionsArea: implicit and explicit `expr as Type` coercions

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

Status: Open.

#103259 In rust-lang/rust;

· oconnor663 opened on Oct 19, 2022

<code>str::array_split</code> for splitting a string into a constant number of substrings

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

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

A-strArea: str and StringArea: str and String

T-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.Relevant to the library API team, which will review and decide on the PR/issue.

Status: Open.

#102905 In rust-lang/rust;

· pitaj opened on Oct 11, 2022

Function operating on arrays performs a lot worse for arrays of length 2

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

A-codegenArea: Code generationArea: Code generation

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.

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

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.

#102274 In rust-lang/rust;

· Canleskis opened on Sep 25, 2022