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regression: "cycle detected when borrow-checking" in <code>offset_of!</code>

A-arrayArea: `[T; N]`Area: `[T; N]`

A-const-evalArea: Constant evaluation, covers all const contexts (static, const fn, ...)Area: Constant evaluation, covers all const contexts (static, const fn, ...)

A-constant-promotionArea: constant promotionArea: constant promotion

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

I-cycleIssue: A query cycle occurred while none was expectedIssue: A query cycle occurred while none was expected

P-mediumMedium priorityMedium priority

regression-from-stable-to-betaPerformance or correctness regression from stable to beta.Performance or correctness regression from stable to beta.

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

S-has-bisectionStatus: A bisection has been found for this issueStatus: A bisection has been found for this issue

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

Status: Open.

#150464 In rust-lang/rust;

· cuviper opened on Dec 28, 2025

Regressions in 1.93.0 crater run: rustdoc errors on invalid <code>#[test]</code> attribute

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

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

P-lang-drag-0Lang team prioritization drag level 0.https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang.Lang team prioritization drag level 0.https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang.

regression-from-stable-to-betaPerformance or correctness regression from stable to beta.Performance or correctness regression from stable to beta.

S-has-bisectionStatus: A bisection has been found for this issueStatus: A bisection has been found for this issue

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.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#150665 In rust-lang/rust;

· theemathas opened on Jan 4, 2026

Regression: "rust-lld: error: undefined symbol: Rlog1p"

A-linkersArea: linkers... you gotta love linkersArea: linkers... you gotta love linkers

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

regression-from-stable-to-betaPerformance or correctness regression from stable to beta.Performance or correctness regression from stable to beta.

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.

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.

#150663 In rust-lang/rust;

· theemathas opened on Jan 4, 2026

Regression affecting <code>static-init</code> versions 1.0.1-1.0.3: "failed to resolve: use of unresolved module or unlinked crate <code>parking_lot</code>"

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

regression-from-stable-to-betaPerformance or correctness regression from stable to beta.Performance or correctness regression from stable to beta.

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.

S-has-bisectionStatus: A bisection has been found for this issueStatus: A bisection has been found for this issue

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.

#150646 In rust-lang/rust;

· theemathas opened on Jan 3, 2026

Nightly <code>usize</code> docs show everything as “Available on 64-bit only”

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

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

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

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

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

S-has-bisectionStatus: A bisection has been found for this issueStatus: A bisection has been found for this 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.

Status: Open.

#149786 In rust-lang/rust;

· narpfel opened on Dec 8, 2025

TrivialClone is not derived for generic types (Performance regression)

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

A-specializationArea: Trait impl specializationArea: Trait impl specialization

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

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

P-highHigh priorityHigh priority

regression-from-stable-to-betaPerformance or correctness regression from stable to beta.Performance or correctness regression from stable to beta.

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-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.

#149752 In rust-lang/rust;

· theemathas opened on Dec 8, 2025

Optimization of deinitialization became worse in nightly

A-codegenArea: Code generationArea: Code generation

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

regression-from-stable-to-betaPerformance or correctness regression from stable to beta.Performance or correctness regression from stable to beta.

S-has-bisectionStatus: A bisection has been found for this issueStatus: A bisection 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.

#149727 In rust-lang/rust;

· theemathas opened on Dec 7, 2025

ICE <code>interpreter ran out of memory</code>

A-mir-optArea: MIR optimizationsArea: MIR optimizations

A-mir-opt-GVNArea: MIR opt Global Value Numbering (GVN)Area: MIR opt Global Value Numbering (GVN)

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) ❄️

P-mediumMedium priorityMedium priority

regression-from-stable-to-betaPerformance or correctness regression from stable to beta.Performance or correctness regression from stable to beta.

S-has-bisectionStatus: A bisection has been found for this issueStatus: A bisection 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.

#149643 In rust-lang/rust;

· matthiaskrgr opened on Dec 4, 2025