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Tracking Issue for evaluating macos-26 runner images

A-CIArea: Our Github Actions CIArea: Our Github Actions CI

A-github-actionsArea: GitHub Actions (GHA)Area: GitHub Actions (GHA)

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

O-macosOperating system: macOSOperating system: macOS

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

Status: Open.

#157687 In rust-lang/rust;

· jieyouxu opened on Jun 10, 2026

codegen: Unnecessary memcpy when returning a mutated mut self

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.

Status: Open.

#157685 In rust-lang/rust;

· Filiprogrammer opened on Jun 9, 2026

[assumptions-on-binders] unwrap on None ICE in infer/context.rs during mir_borrowck with async closure capturing references

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

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-has-mcveStatus: A Minimal Complete and Verifiable Example has been found for this issueStatus: 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.

#157678 In rust-lang/rust;

· tmandry opened on Jun 9, 2026

Stack slots are not being reused due to missing LLVM IR lifetime annotations.

A-mir-optArea: MIR optimizationsArea: MIR optimizations

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

I-prioritizeIssue needs a team member to assess the impact. Will be replaced by P-{low,medium,high,critical}Issue needs a team member to assess the impact. Will be replaced by P-{low,medium,high,critical}

regression-untriagedUntriaged performance or correctness regression.Untriaged performance or correctness regression.

Status: Open.

#157676 In rust-lang/rust;

· VinceQu opened on Jun 9, 2026

[ICE]: "warning: error copying object file" damages incremental build cache, induces ICE in subsequent builds unless pruned

A-incr-compArea: Incremental compilationArea: Incremental compilation

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) ❄️

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.

O-windowsOperating system: WindowsOperating system: Windows

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.

#157674 In rust-lang/rust;

· nabijaczleweli opened on Jun 9, 2026

incorrect type resolution during conflict checking from extern crate

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

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.

Status: Open.

#157666 In rust-lang/rust;

· jsen- opened on Jun 9, 2026

Unstable mir::interpret::AllocIds in parallel frontend

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.

Status: Open.

#157665 In rust-lang/rust;

· zetanumbers opened on Jun 9, 2026

libtest: crafted terminfo color capability can cause large allocation during test output

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

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.

Status: Open.

#157664 In rust-lang/rust;

· bunch-suffice-ivy opened on Jun 9, 2026

dcx.try_steal_modify_and_emit_err race

A-parallel-compilerArea: parallel compilerArea: parallel compiler

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

D-diagnostic-infraDiagnostics: Issues that affect all diagnostics, or relate to the diagnostic machinery itself.Diagnostics: Issues that affect all diagnostics, or relate to the diagnostic machinery itself.

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.

#157659 In rust-lang/rust;

· zetanumbers opened on Jun 9, 2026

Building with optimizations can skip monomorphizing some types, making errors disappear

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-mir-optArea: MIR optimizationsArea: MIR optimizations

A-monomorphizationArea: MonomorphizationArea: Monomorphization

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.

#157654 In rust-lang/rust;

· RalfJung opened on Jun 9, 2026

Static EII defaults are currently unsupported on macOS

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

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

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.

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.

#157649 In rust-lang/rust;

· AsakuraMizu opened on Jun 9, 2026

Incorrect docs for comparing raw pointers to DST

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-DSTsArea: Dynamically-sized types (DSTs)Area: Dynamically-sized types (DSTs)

A-raw-pointersArea: raw pointers, MaybeUninit, NonNullArea: raw pointers, MaybeUninit, NonNull

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.

Status: Open.

#157640 In rust-lang/rust;

· theemathas opened on Jun 9, 2026