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

Tracking issue for release notes of #140557: Remove manual WF hack 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.
#141535 opened May 25, 2025 by rustbot 1.89.0
canonicalizating placeholders should ignore their bound_var C-cleanup Category: PRs that clean code up or issues documenting cleanup. T-types Relevant to the types team, which will review and decide on the PR/issue.
#141428 opened May 23, 2025 by lcnr
@lcnr
builtin dyn impl no guide inference 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.
#141352 opened May 21, 2025 by lcnr Loading…
@compiler-errors
10
ICE: overflow evaluating the requirement / impl was matchable against binder but now it is not A-associated-items Area: Associated items (types, constants & functions) A-trait-system Area: Trait system C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. 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-types Relevant to the types team, which will review and decide on the PR/issue.
#141124 opened May 17, 2025 by matthiaskrgr
1
Tracking issue for release notes of #139419: Error on recursive opaque ty in HIR typeck 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.
#141098 opened May 16, 2025 by rustbot 1.89.0
Type equality bounds disable implied projection outlives bounds A-implied-bounds Area: Implied bounds / inferred outlives-bounds A-lifetimes Area: Lifetimes / regions 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.
#141054 opened May 15, 2025 by QuineDot
Tracking issue for release notes of #140208: Make well-formedness predicates no longer coinductive 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.
#141046 opened May 15, 2025 by rustbot 1.89.0
[WIP] Expand free alias types during variance computation F-lazy_type_alias `#![feature(lazy_type_alias)]` perf-regression Performance regression. rla-silenced Silences rust-log-analyzer postings to the PR it's added on. 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.
#141030 opened May 15, 2025 by fmease • Draft
1
@BoxyUwU
6
Expand free alias types when computing implied outlives-bounds F-lazy_type_alias `#![feature(lazy_type_alias)]` 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.
#141007 opened May 14, 2025 by fmease • Draft
@BoxyUwU
2
endless loop instead of an overflow error, in the presence of multiple requirements that would overflow. A-GATs Area: Generic associated types (GATs) A-higher-ranked Area: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs) A-trait-system Area: Trait system C-bug Category: This is a bug. fixed-by-next-solver Fixed by the next-generation trait solver, `-Znext-solver`. I-hang Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc. T-types Relevant to the types team, which will review and decide on the PR/issue.
#140946 opened May 12, 2025 by moshevds
3
Type inference of inferred repeat expr counts is not as strong as it could be A-array Area: `[T; N]` C-bug Category: This is a bug. F-generic_arg_infer Using `_` as a const argument: #![feature(generic_arg_infer)]` F-marker_trait_attr `#![feature(marker_trait_attr)]` 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.
#140855 opened May 9, 2025 by BoxyUwU
Tracking issue for release notes of #139635: Finalize repeat expr inference behaviour with inferred repeat counts 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.
#140846 opened May 9, 2025 by rustbot 1.89.0
Make trait aliases eligible generic containers wrt. ambient object lifetime defaults A-dyn-trait Area: trait objects, vtable layout A-lifetimes Area: Lifetimes / regions C-bug Category: This is a bug. F-trait_alias `#![feature(trait_alias)]` S-blocked Status: Blocked on something else such as an RFC or other implementation work. T-types Relevant to the types team, which will review and decide on the PR/issue.
#140710 opened May 6, 2025 by fmease
@fmease
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-member-constraints `#[feature(member_constraints)]` 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
wf: emit projection goal for aliases perf-regression Performance regression. 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. WG-trait-system-refactor The Rustc Trait System Refactor Initiative (-Znext-solver)
#140558 opened May 1, 2025 by lcnr Loading…
2
@compiler-errors
29
RPIT(IT)s "leak" internal implementation details of lifetime capturing via boundedness A-impl-trait Area: `impl Trait`. Universally / existentially quantified anonymous types with static dispatch. A-lifetimes Area: Lifetimes / regions 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.
#140517 opened Apr 30, 2025 by Y-jiji
14
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-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. 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, or significant enough to need a team FCP to proceed. 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.
#140283 opened Apr 25, 2025 by adwinwhite Loading…
1
@oli-obk
11
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
1
@fmease
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
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
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