Search results

[ICE]: unexpected cyclic definition

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

F-type_alias_impl_trait`#[feature(type_alias_impl_trait)]``#[feature(type_alias_impl_trait)]`

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.

Status: Open.

#155540 In rust-lang/rust;

· matthiaskrgr opened on Apr 20, 2026

[ICE]: Attempting to cast non-castable types

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

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

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.

#155539 In rust-lang/rust;

· matthiaskrgr opened on Apr 20, 2026

Post-mono cycle ICE with dyn and RPIT

A-coercionsArea: implicit and explicit `expr as Type` coercionsArea: implicit and explicit `expr as Type` coercions

A-coinductionArea: Concerning coinduction, most often for auto traitsArea: Concerning coinduction, most often for auto traits

A-dyn-traitArea: trait objects, vtable layoutArea: trait objects, vtable layout

A-impl-traitArea: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.Area: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.

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

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) ❄️

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.

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.

#155538 In rust-lang/rust;

· theemathas opened on Apr 20, 2026

Cheap derive(PartialOrd) for non-generic types

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

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.

#155537 In rust-lang/rust;

· nnethercote opened on Apr 20, 2026

Include llvm-profgen in llvm-tools component

A-llvm-bintoolsArea: LLVM bintools (`llvm-nm` et.). Note that `llvm-tools{,-preview` has no stability guarantees.Area: LLVM bintools (`llvm-nm` et.). Note that `llvm-tools{,-preview` has no stability guarantees.

C-feature-requestCategory: A feature request, i.e: not implemented / a PR.Category: A feature request, i.e: not implemented / a PR.

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.

#155525 In rust-lang/rust;

· zamazan4ik opened on Apr 19, 2026

Unsoundness in next-solver when checking lifetime requirements for RPIT

A-associated-itemsArea: Associated items (types, constants & functions)Area: Associated items (types, constants & functions)

A-GATsArea: Generic associated types (GATs)Area: Generic associated types (GATs)

A-impl-traitArea: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.Area: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch.

A-trait-systemArea: Trait systemArea: Trait system

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

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

requires-nightlyThis issue requires a nightly compiler in some way. When possible, use a F-* label instead.This issue requires a nightly compiler in some way. When possible, use a F-* label instead.

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-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.

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

Status: Open.

#155520 In rust-lang/rust;

· maxdexh opened on Apr 19, 2026

spurious? failure in test-float-parse

A-floating-pointArea: Floating point numbers and arithmeticArea: Floating point numbers and arithmetic

A-spuriousArea: Spurious failures in builds (spuriously == for no apparent reason)Area: Spurious failures in builds (spuriously == for no apparent reason)

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

O-AArch64Armv8-A or later processors in AArch64 modeArmv8-A or later processors in AArch64 mode

O-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)Operating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)

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.

#155518 In rust-lang/rust;

· Mark-Simulacrum opened on Apr 19, 2026

Incorrect suggestion when assigning Option<T> to a T in a struct pattern

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

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.

#155516 In rust-lang/rust;

· redlaWw opened on Apr 19, 2026

Suggest enclosing {:?}/{:#?}/{} in "" when used as a format argument

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

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.

#155508 In rust-lang/rust;

· makai410 opened on Apr 19, 2026

Macro "missing fragment specifier" when accidentally prefixed with $

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

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

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.

#155505 In rust-lang/rust;

· DanielEScherzer opened on Apr 19, 2026

mention expect if we try to unwrap("string lit")

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

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.

#155502 In rust-lang/rust;

· matthiaskrgr opened on Apr 18, 2026

[ICE]: Wrust-2021-incompatible-closure-captures

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

F-type_alias_impl_trait`#[feature(type_alias_impl_trait)]``#[feature(type_alias_impl_trait)]`

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.

Status: Open.

#155497 In rust-lang/rust;

· matthiaskrgr opened on Apr 18, 2026