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cargo test registry::sparse_blocking_count is potentially 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-cargoRelevant to the cargo team, which will review and decide on the PR/issue.Relevant to the cargo team, which will review and decide on the PR/issue.

Status: Open.

#157295 In rust-lang/rust;

· jieyouxu opened on Jun 2, 2026

Tracking Issue for ManuallyDrop<T>::pinned_*

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-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.

#157268 In rust-lang/rust;

· asder8215 opened on Jun 1, 2026

Incorrect differentiation of uninitialized and possibly-uninitialized

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

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.

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.

#157267 In rust-lang/rust;

· ParisaBM opened on Jun 1, 2026

Nonsensical #[path] attributes are allowed.

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

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

E-easyCall for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.

E-mentorCall for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion.Call for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion.

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.

#157260 In rust-lang/rust;

· theemathas opened on Jun 1, 2026

Very large error file creation on exponentially growing type

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.

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.

#157259 In rust-lang/rust;

· oli-obk opened on Jun 1, 2026

2x release build performance regression with Rust 1.96.0

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

I-compiletimeIssue: Problems and improvements with respect to compile times.Issue: Problems and improvements with respect to compile times.

I-prioritizeIssue: Indicates that prioritization has been requested for this issue.Issue: Indicates that prioritization has been requested for this issue.

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

S-needs-reproStatus: This issue has no reproduction and needs a reproduction to make progress.Status: This issue has no reproduction and needs a reproduction to make progress.

Status: Open.

#157257 In rust-lang/rust;

· dspicher opened on Jun 1, 2026

#![macro_use] is accepted at crate root

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

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

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.

#157250 In rust-lang/rust;

· theemathas opened on Jun 1, 2026

rustdoc: Actually render the new sizedness bounds if sized_hierarchy is enabled unless #![doc(dont_leak_sized_hierarchy)] (to be used in the stdlib)

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

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

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.

#157247 In rust-lang/rust;

· fmease opened on Jun 1, 2026

Use idiomatic std::mem::take instead of std::mem::replace

C-cleanupCategory: PRs that clean code up or issues documenting cleanup.Category: PRs that clean code up or issues documenting cleanup.

E-easyCall for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.

E-mentorCall for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion.Call for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion.

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.

#157245 In rust-lang/rust;

· ShinysLove opened on Jun 1, 2026

Strange precise closure capture behavior with uninhabited types and an empty match

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

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

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

T-langRelevant to the language teamRelevant to the language team

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#157243 In rust-lang/rust;

· theemathas opened on Jun 1, 2026

ARM Big Endian partialEq bug

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

E-needs-bisectionCall for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustcCall for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustc

I-miscompileIssue: Correct Rust code lowers to incorrect machine codeIssue: Correct Rust code lowers to incorrect machine code

I-prioritizeIssue: Indicates that prioritization has been requested for this issue.Issue: Indicates that prioritization has been requested for this issue.

O-ArmTarget: 32-bit Arm processors (armv6, armv7, thumb...), including 64-bit Arm in AArch32 stateTarget: 32-bit Arm processors (armv6, armv7, thumb...), including 64-bit Arm in AArch32 state

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.

#157239 In rust-lang/rust;

· NielsOuvrard opened on Jun 1, 2026

MSP430 missing MSP430X instruction set

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-msp430

Status: Open.

#157229 In rust-lang/rust;

· gjbauer opened on Jun 1, 2026