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[ICE]: assumptions on binder: outlives clauses should not error outside borrowck

-Zassumptions-on-bindersUnstable option: `-Zassumptions-on-bindersUnstable option: `-Zassumptions-on-binders

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.

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.

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

Status: Open.

#157732 In rust-lang/rust;

· matthiaskrgr opened on Jun 10, 2026

[ICE]: assumptions on binders: is not fully resolved

-Zassumptions-on-bindersUnstable option: `-Zassumptions-on-bindersUnstable option: `-Zassumptions-on-binders

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

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

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.

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.

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

Status: Open.

#157731 In rust-lang/rust;

· matthiaskrgr opened on Jun 10, 2026

Tracking issue for release notes of #155299: make repr_transparent_non_zst_fields a hard error

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-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.

#157730 In rust-lang/rust;

· rustbot opened on Jun 10, 2026

[ICE]: assumptions on binders: failed to resolve instance for <dyn Derived<()> as Derived<()>>::is_derived

-Zassumptions-on-bindersUnstable option: `-Zassumptions-on-bindersUnstable option: `-Zassumptions-on-binders

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.

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.

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

Status: Open.

#157729 In rust-lang/rust;

· matthiaskrgr opened on Jun 10, 2026

std::sync::mpsc::Sender::send can block the current thread

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

I-libs-api-nominatedNominated for discussion during a libs-api team meeting.Nominated for discussion during a libs-api team meeting.

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.

#157728 In rust-lang/rust;

· cyexclam opened on Jun 10, 2026

Tracking issue for release notes of #157201: Move logic for emitting UNSAFE_CODE for unsafe attributes to attr parsing

A-attributesArea: Attributes (`#[…]`, `#![…]`)Area: Attributes (`#[…]`, `#![…]`)

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-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.

#157704 In rust-lang/rust;

· rustbot opened on Jun 10, 2026

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

-Zassumptions-on-bindersUnstable option: `-Zassumptions-on-bindersUnstable option: `-Zassumptions-on-binders

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