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Draft release notes for 1.87
#140133 opened Apr 21, 2025 by BoxyUwU
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Issues list

Type annotations needed for closure with associated type A-closures Area: Closures (`|…| { … }`) A-inference Area: Type inference C-enhancement Category: An issue proposing an enhancement or a PR with one. T-types Relevant to the types team, which will review and decide on the PR/issue.
#140603 opened May 3, 2025 by camsteffen
1
member constraints are order-dependent A-impl-trait Area: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch. A-NLL Area: Non-lexical lifetimes (NLL) C-bug Category: This is a bug. T-types Relevant to the types team, which will review and decide on the PR/issue.
#140569 opened May 2, 2025 by lcnr
@lcnr
GAT code doesn't compile when plug in the type directly A-GATs Area: Generic associated types (GATs) 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.
#140517 opened Apr 30, 2025 by Y-jiji
4
Non-implemented trait causes ICE C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ P-low Low priority regression-from-stable-to-beta Performance or correctness regression from stable to beta. S-has-bisection Status: a bisection has been found for this issue 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.
#140462 opened Apr 29, 2025 by dpytaylo
@compiler-errors
3
ICE: encountered type variable (2) C-bug Category: This is a bug. F-unboxed_closures `#![feature(unboxed_closures)]` I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ 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.
#140443 opened Apr 29, 2025 by Danila-Bain
3
ICE - Mixing Async & GAT traits (invalid code) A-GATs Area: Generic associated types (GATs) C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ 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.
#140381 opened Apr 28, 2025 by AldaronLau
4
Trivial bounds check doesn't consider non-global predicates *after* normalization C-bug Category: This is a bug. T-types Relevant to the types team, which will review and decide on the PR/issue.
#140309 opened Apr 25, 2025 by compiler-errors
1
@lcnr
Fix accidental type inference in array coercion needs-fcp This change is insta-stable, so needs a completed FCP to proceed. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-types Relevant to the types team, which will review and decide on the PR/issue.
#140283 opened Apr 25, 2025 by adwinwhite Loading…
1
@oli-obk
8
Free type aliases should not require all generic parameters to be used A-variance Area: Variance (https://doc.rust-lang.org/nomicon/subtyping.html) C-bug Category: This is a bug. F-lazy_type_alias `#![feature(lazy_type_alias)]` 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.
#140230 opened Apr 24, 2025 by BoxyUwU
11
false positive "unconstrained opaque type" error on impl trait in trait associated type C-bug Category: This is a bug. F-impl_trait_in_assoc_type `#![feature(impl_trait_in_assoc_type)]` requires-nightly This issue requires a nightly compiler in some way. T-types Relevant to the types team, which will review and decide on the PR/issue.
#140222 opened Apr 23, 2025 by glorv
2
Nested but non-conflicting projection predicates emerging from supertrait bounds leads to ambiguity C-bug Category: This is a bug. F-arbitrary_self_types `#![feature(arbitrary_self_types)]` T-types Relevant to the types team, which will review and decide on the PR/issue.
#140217 opened Apr 23, 2025 by dingxiangfei2009
1
incompletely relating alias args is unsound during vtable creation fixed-by-next-solver Fixed by the next-generation trait solver, `-Znext-solver`. 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.
#140212 opened Apr 23, 2025 by lcnr
1
@compiler-errors
Make well-formedness predicates no longer coinductive disposition-merge This issue / PR is in PFCP or FCP with a disposition to merge it. proposed-final-comment-period Proposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off. S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-types Relevant to the types team, which will review and decide on the PR/issue.
#140208 opened Apr 23, 2025 by compiler-errors Loading…
2
@lcnr
48
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
Tracking issue for release notes of #139646: check types of const param defaults needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. relnotes Marks issues that should be documented in the release notes of the next release. relnotes-tracking-issue Marks issues tracking what text to put in release notes. T-types Relevant to the types team, which will review and decide on the PR/issue.
#140183 opened Apr 23, 2025 by rustbot 1.88.0
Struct containing only associated type of generic may be too constraining variance wise A-variance Area: Variance (https://doc.rust-lang.org/nomicon/subtyping.html) C-discussion Category: Discussion or questions that doesn't represent real issues. T-types Relevant to the types team, which will review and decide on the PR/issue.
#140109 opened Apr 21, 2025 by krtab
Duplicate doubly higher-ranked trait bound fails to compile A-trait-system Area: Trait system C-bug Category: This is a bug. T-types Relevant to the types team, which will review and decide on the PR/issue.
#140071 opened Apr 20, 2025 by Veykril
1
Generate obligations when possible instead of rejecting with ambiguity S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. 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.
#139955 opened Apr 17, 2025 by dingxiangfei2009 • Draft
@lcnr
3
resolution ambiguity between inherent and (prelude-provided) trait methods should have more guard rails A-method-lookup Area: method lookup (typeck, post `rustc_resolve`, not to be confused with `A-resolve`) A-trait-system Area: Trait 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-lang Relevant to the language 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.
#139732 opened Apr 13, 2025 by pnkfelix
Associated Type Equality Bounds are not properly resolved C-bug Category: This is a bug. needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. 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.
#139682 opened Apr 11, 2025 by Jeff-A-Martin
1
Handle regions equivalent to 'static in non_local_bounds S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. 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.
#139668 opened Apr 11, 2025 by matthewjasper Loading…
2
@compiler-errors
10
ICE: compiler/rustc_middle/src/ty/normalize_erasing_regions.rs:169:13: Failed to normalize Alias(... A-impl-trait Area: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch. 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.
#139659 opened Apr 11, 2025 by theemathas
1
cargo check works fine, but cargo build gives "overflow evaluating the requirement " C-bug Category: This is a bug. needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. 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
Array repeat exprs dont permit non-copy adt ctors as elements C-bug Category: This is a bug. C-feature-request Category: A feature request, i.e: not implemented / a PR. T-lang Relevant to the language 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.
#139642 opened Apr 10, 2025 by BoxyUwU
1
Finalize repeat expr inference behaviour with inferred repeat counts disposition-merge This issue / PR is in PFCP or FCP with a disposition to merge it. final-comment-period In the final comment period and will be merged soon unless new substantive objections are raised. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. S-waiting-on-fcp Status: PR is in FCP and is awaiting for FCP to complete. T-types Relevant to the types team, which will review and decide on the PR/issue.
#139635 opened Apr 10, 2025 by BoxyUwU Loading…
@compiler-errors
17
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