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Add <code>String&lt;A&gt;</code> type with custom allocator parameter

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

A-rustc-dev-guideArea: rustc-dev-guideArea: rustc-dev-guide

A-rustdoc-searchArea: Rustdoc's search featureArea: Rustdoc's search feature

S-waiting-on-reviewStatus: Awaiting review from the assignee but also interested parties.Status: Awaiting review from the assignee but also interested parties.

T-clippyRelevant to the Clippy team.Relevant to the Clippy team.

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

T-releaseRelevant to the release subteam, which will review and decide on the PR/issue.Relevant to the release subteam, which will review and decide on the PR/issue.

T-rust-analyzerRelevant to the rust-analyzer team, which will review and decide on the PR/issue.Relevant to the rust-analyzer team, which will review and decide on the PR/issue.

T-rustdocRelevant to the rustdoc team, which will review and decide on the PR/issue.Relevant to the rustdoc team, which will review and decide on the PR/issue.

T-rustdoc-frontendRelevant to the rustdoc-frontend team, which will review and decide on the web UI/UX output.Relevant to the rustdoc-frontend team, which will review and decide on the web UI/UX output.

WG-trait-system-refactorThe Rustc Trait System Refactor Initiative (-Znext-solver)The Rustc Trait System Refactor Initiative (-Znext-solver)

Status: Open (in progress).

rust-lang/rustnumber 149328

#149328 In rust-lang/rust;

· shua opened on Nov 25, 2025

LLVM not optimizing out heap allocations when using a custom allocator

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

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.

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#149230 In rust-lang/rust;

· izagawd opened on Nov 23, 2025

Tracking issue for release notes of #55724: Tracking issue for alloc_layout_extra

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

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.

#148117 In rust-lang/rust;

· rustbot opened on Oct 25, 2025

unresolved symbol <code>rdl_oom</code> when compiling <code>cdylib</code> crate with <code>no_global_oom_handling</code> on <code>pc-windows-msvc</code> target

-Zfixed-x18Unstable option: -Zfixed-x18Unstable option: -Zfixed-x18

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

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.

O-windows-msvcToolchain: MSVC, Operating system: WindowsToolchain: MSVC, Operating system: Windows

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

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

Status: Open.

#138758 In rust-lang/rust;

· wmmc88 opened on Mar 20, 2025

alloc_error_handler can be an <code>unsafe fn</code> which is then unsoundly invoked

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

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

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

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.

#134225 In rust-lang/rust;

· RalfJung opened on Dec 12, 2024

Tracking Issue for __rust_no_alloc_shim_is_unstable

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

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

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

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.

#123015 In rust-lang/rust;

· Mark-Simulacrum opened on Mar 24, 2024

<code>RawVec</code> sets capacity incorrectly, causing potentially many bugs

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

A-collectionsArea: `std::collections`Area: `std::collections`

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

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

Status: Open.

#116580 In rust-lang/rust;

· jmaargh opened on Oct 9, 2023

Using <code>thread_local!</code> with <code>Drop</code> from <code>GlobalAlloc::alloc</code> causes crashes

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

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

P-highHigh priorityHigh priority

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

Status: Open.

#116390 In rust-lang/rust;

· nvzqz opened on Oct 3, 2023

Crash during thread teardown using TLS in global allocator on macOS

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

A-threadArea: `std::thread`Area: `std::thread`

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

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

O-macosOperating system: macOSOperating system: macOS

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.

#115149 In rust-lang/rust;

· jrose-signal opened on Aug 23, 2023

Regression in global_allocator when using prefer-dynamic on 1.71.0 and above

-Cprefer-dynamicCodegen option: Prefer dynamic linking to static linking.Codegen option: Prefer dynamic linking to static linking.

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

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.

P-mediumMedium priorityMedium priority

regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.Performance or correctness regression from one stable version to another.

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.

#114518 In rust-lang/rust;

· alexkornitzer opened on Aug 5, 2023

Unclear unwind safety for <code>std::alloc::Allocator::{grow,shrink}</code>

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

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.

#104224 In rust-lang/rust;

· kpreid opened on Nov 10, 2022

global_allocator does not work with -C prefer-dynamic

-Cprefer-dynamicCodegen option: Prefer dynamic linking to static linking.Codegen option: Prefer dynamic linking to static linking.

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

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

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.

#100781 In rust-lang/rust;

· nicbn opened on Aug 19, 2022