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Issues: rust-lang/rust

Draft release notes for 1.88.0
#141598 opened May 26, 2025 by Mark-Simulacrum
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Issues list

TAIT: item does not constrain after diverging expression A-type-system Area: Type system C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#141779 opened May 30, 2025 by narpfel
Incoherent (?) Lifetime HRTB on associated type results in unsoundness in stable, safe code A-associated-items Area: Associated items (types, constants & functions) A-closures Area: Closures (`|…| { … }`) A-type-system Area: Type system C-bug Category: This is a bug. I-unsound Issue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness P-high High priority regression-from-stable-to-stable Performance or correctness regression from one stable version to another. T-types Relevant to the types team, which will review and decide on the PR/issue.
#141713 opened May 29, 2025 by maxdexh
11
Adding use std::error::Error unexpectedly breaks lifetime inference A-lifetimes Area: Lifetimes / regions A-type-system Area: Type system C-discussion Category: Discussion or questions that doesn't represent real issues. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#141673 opened May 28, 2025 by phip1611
4
Trait unexpectedly not implemented with recursive where clause, with poor error message A-type-system Area: Type system C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#141111 opened May 17, 2025 by emilio
relaxed ?Sized bound getting implied by super trait warn A-lints Area: Lints (warnings about flaws in source code) such as unused_mut. A-type-system Area: Type system C-feature-request Category: A feature request, i.e: not implemented / a PR. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#140962 opened May 13, 2025 by lcnr
unconstrained type parameter with associated types that are actually constrained A-type-system Area: Type system C-bug Category: This is a bug. T-types Relevant to the types team, which will review and decide on the PR/issue.
#140201 opened Apr 23, 2025 by y86-dev
1
cargo check works fine, but cargo build gives "overflow evaluating the requirement " A-type-system Area: Type system C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#139658 opened Apr 11, 2025 by theemathas
1
GAT: Fails to compile with additional bounds A-lifetimes Area: Lifetimes / regions A-trait-system Area: Trait system A-type-system Area: Type system C-bug Category: This is a bug. T-types Relevant to the types team, which will review and decide on the PR/issue.
#139207 opened Apr 1, 2025 by Ddystopia
9
error performing operation: fully_perform in ascribe_user_type A-associated-items Area: Associated items (types, constants & functions) A-type-system Area: Type system C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#138707 opened Mar 19, 2025 by VincentVanlaer
2
Inconsistent fn casting behavior in if-else branches for tuple and struct A-coercions Area: implicit and explicit `expr as Type` coercions A-type-system Area: Type system C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#135970 opened Jan 24, 2025 by gaesa
Typesystem soundness hole involving cyclically-defined ATIT, and normalization in trait bounds A-associated-items Area: Associated items (types, constants & functions) A-trait-system Area: Trait system A-type-system Area: Type system C-bug Category: This is a bug. I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ I-unsound Issue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness P-medium Medium priority T-types Relevant to the types team, which will review and decide on the PR/issue.
#135011 opened Jan 2, 2025 by steffahn
21
candidate selection for normalization and trait goals disagree A-type-system Area: Type system P-low Low priority T-types Relevant to the types team, which will review and decide on the PR/issue.
#133044 opened Nov 14, 2024 by lcnr
3
Tracking issue for TypingMode transition A-type-system Area: Type system C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC T-types Relevant to the types team, which will review and decide on the PR/issue.
#132279 opened Oct 28, 2024 by lcnr
3 tasks
rustc consumes > 50GB memory, completes eventually but def. stuck on something A-type-system Area: Type system C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example I-compilemem Issue: Problems and improvements with respect to memory usage during compilation. I-compiletime Issue: Problems and improvements with respect to compile times. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#129844 opened Sep 1, 2024 by GlenDC
5
Work tracking issue for moving rustc_infer error reporting into rustc_trait_selection A-diagnostics Area: Messages for errors, warnings, and lints A-type-system Area: Type system C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#127492 opened Jul 8, 2024 by compiler-errors
7 of 12 tasks
@compiler-errors
Call to function broken by unrelated constraint on generic function containing the call A-type-system Area: Type system C-bug Category: This is a bug. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#125274 opened May 19, 2024 by tonyelewis
1
Exponential time complexity when type checking code with equality constraints A-type-system Area: Type system C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-compiletime Issue: Problems and improvements with respect to compile times. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#125267 opened May 19, 2024 by jhpratt
3
The value no longer satisfies the constraint after passing through identity, which seems counterintuitive A-type-system Area: Type system C-discussion Category: Discussion or questions that doesn't represent real issues. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#124481 opened Apr 28, 2024 by A4-Tacks
1
Enum variants can't be imported via type alias A-type-system Area: Type system C-bug Category: This is a bug. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-lang Relevant to the language team T-types Relevant to the types team, which will review and decide on the PR/issue.
#123131 opened Mar 27, 2024 by pitdicker
2
error: cycle detected on latest rust nightly for windows build. A-type-system Area: Type system C-bug Category: This is a bug. S-needs-repro Status: This issue has no reproduction and needs a reproduction to make progress. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#122469 opened Mar 14, 2024 by Wyvern
1
internal refactoring: cleanup type relations A-technical-debt Area: Internal cleanup work A-type-system Area: Type system C-cleanup Category: PRs that clean code up or issues documenting cleanup. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue. WG-trait-system-refactor The Rustc Trait System Refactor Initiative (-Znext-solver)
#121159 opened Feb 15, 2024 by lcnr
3 of 4 tasks
3
ICE no errors encountered even though delay_span_bug issued - Bevy - Unused trait method name same as struct method name A-type-system Area: Type system C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#120918 opened Feb 11, 2024 by MJE10
1
Compile is too slow A-type-system Area: Type system C-bug Category: This is a bug. E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example I-compiletime Issue: Problems and improvements with respect to compile times. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#119736 opened Jan 8, 2024 by araraloren
4
Misleading "match arms have incompatible types" when match expression used in unimplemented operation A-diagnostics Area: Messages for errors, warnings, and lints A-type-system Area: Type system D-confusing Diagnostics: Confusing error or lint that should be reworked. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#119683 opened Jan 7, 2024 by LilyIsTrans
1
Unable to infer fn item to fn ptr coercion when fn ptr nested within more than one level of generics A-inference Area: Type inference A-type-system Area: Type system C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#119605 opened Jan 5, 2024 by collinmay
ProTip! Updated in the last three days: updated:>2025-05-30.