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Excessive rustc memory usage and compile time

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.

#157764 In rust-lang/rust;

· imre-kis-arm opened on Jun 11, 2026

False positive of lint missing_debug_implementations if Debug is implemented for an alias type (e.g., projection) that can get normalized to the relevant type

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

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

L-false-positiveLint: False positive (should not have fired).Lint: False positive (should not have fired).

L-missing_debug_implementationsLint: missing_debug_implementationsLint: missing_debug_implementations

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.

#157758 In rust-lang/rust;

· fmease opened on Jun 11, 2026

False positive of lint missing_debug_implementations if Debug is implemented for a free alias type that expands to the relevant type

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

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

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

L-false-positiveLint: False positive (should not have fired).Lint: False positive (should not have fired).

L-missing_debug_implementationsLint: missing_debug_implementationsLint: missing_debug_implementations

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.

#157757 In rust-lang/rust;

· fmease opened on Jun 11, 2026

Cannot impl auto traits for free alias types that expand to otherwise legal self type

A-auto-traitsArea: auto traits (e.g., `auto trait Send {}`)Area: auto traits (e.g., `auto trait Send {}`)

A-coherenceArea: CoherenceArea: Coherence

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

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

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.

#157756 In rust-lang/rust;

· fmease opened on Jun 11, 2026

Cannot implement certain built-in traits like Copy or Drop for free alias types that expand to otherwise legal self type

A-coherenceArea: CoherenceArea: Coherence

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

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

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.

#157755 In rust-lang/rust;

· fmease opened on Jun 11, 2026

step_by() on new ranges is less optimized than the old ranges.

A-iteratorsArea: IteratorsArea: Iterators

A-specializationArea: Trait impl specializationArea: Trait impl specialization

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

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

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

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-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.

#157754 In rust-lang/rust;

· theemathas opened on Jun 11, 2026

Tracking issue for MCP 994: Add -Zllvm-target-feature target *modifier* to directly set LLVM-level target features, and deprecate doing that with -Ctarget-feature

B-MCP-approvedBlocker: Approved by an accepted MCP but not yet fully implemented.Blocker: Approved by an accepted MCP but not yet fully implemented.

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

S-tracking-unimplementedStatus: The feature has not been implemented.Status: The feature has not been implemented.

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.

#157753 In rust-lang/rust;

· rustbot opened on Jun 11, 2026

Stripping debuginfo on macOS produces misaligned dylibs when MACOSX_DEPLOYMENT_TARGET >= 12.0

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.

O-macosOperating system: macOSOperating system: macOS

Status: Open.

#157750 In rust-lang/rust;

· goranmoomin opened on Jun 11, 2026

rustc SIGSEGV on RISC-V when building simple Hello World on Ubuntu in stable and nightly version

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

I-crashIssue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.

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-riscvTarget: RISC-V architectureTarget: RISC-V architecture

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.

#157749 In rust-lang/rust;

· lokai-kuroi opened on Jun 11, 2026

tests/rustdoc-gui/go-to-collapsed-elem.goml might be flaky

A-testsuiteArea: The testsuite used to check the correctness of rustcArea: The testsuite used to check the correctness of rustc

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

I-flaky-testIssue: A test is flaky/unreliable/spuriously failsIssue: A test is flaky/unreliable/spuriously fails

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.

Status: Open.

#157747 In rust-lang/rust;

· jieyouxu opened on Jun 11, 2026

Performance regression since 1.93 related to MaybeUninit being wrongfully initialized

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.

llvm-fixed-upstreamIssue expected to be fixed by the next major LLVM upgrade, or backported fixesIssue expected to be fixed by the next major LLVM upgrade, or backported fixes

P-highHigh priorityHigh 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.

#157743 In rust-lang/rust;

· glandium opened on Jun 11, 2026

Investigate windows-2025-vs2026 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

E-needs-investigationCall for participation: This issues needs some investigation to determine current statusCall for participation: This issues needs some investigation to determine current status

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.

#157742 In rust-lang/rust;

· jieyouxu opened on Jun 11, 2026