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

[E0521] coroutine should own upvars and assigning internal references to moved captures does not leak the references A-coroutines Area: Coroutines C-enhancement Category: An issue proposing an enhancement or a PR with one. F-coroutines `#![feature(coroutines)]`
#140132 opened Apr 21, 2025 by dingxiangfei2009
3
Initial UnsafePinned implementation [Part 2: Lowering] A-coroutines Area: Coroutines F-coroutines `#![feature(coroutines)]` F-unsafe_pinned `#![feature(unsafe_pinned)]` 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. WG-trait-system-refactor The Rustc Trait System Refactor Initiative (-Znext-solver)
#139896 opened Apr 16, 2025 by Sky9x • Draft
@lcnr
9
Coroutine/Future Send bounds are too restrictive when taking references to !Sync values A-coroutines Area: Coroutines C-bug Category: This is a bug. E-needs-investigation Call for partcipation: This issues needs some investigation to determine current status 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. WG-async Working group: Async & await
#132382 opened Oct 31, 2024 by ds84182
2
ICE: Building async destructor constructor shim is not yet implemented for type: Coroutine -Zvalidate-mir Unstable option: MIR validation A-async-await Area: Async & Await A-coroutines Area: Coroutines A-destructors Area: Destructors (`Drop`, …) 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.
#132103 opened Oct 24, 2024 by matthiaskrgr
1
regression on nightly-2024-03-16 A-coroutines Area: Coroutines C-bug Category: This is a bug. F-coroutines `#![feature(coroutines)]` F-impl_trait_in_assoc_type `#![feature(impl_trait_in_assoc_type)]` P-medium Medium priority regression-untriaged Untriaged performance or correctness regression. 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.
#122618 opened Mar 17, 2024 by xxchan
4
E0308 for coroutines kinda cryptic A-coroutines Area: Coroutines A-diagnostics Area: Messages for errors, warnings, and lints F-coroutines `#![feature(coroutines)]` 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.
#118954 opened Dec 14, 2023 by matthiaskrgr
2
"Implementation not general enough" with async and projection, fixed by wrapping with async move A-async-await Area: Async & Await A-coroutines Area: Coroutines AsyncAwait-Triaged Async-await issues that have been triaged during a working group meeting. 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.
#110339 opened Apr 14, 2023 by tmandry
Tracking issue for incorrect lifetime bound errors in async A-async-await Area: Async & Await A-coroutines Area: Coroutines AsyncAwait-Triaged Async-await issues that have been triaged during a working group meeting. 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-async Working group: Async & await
#110338 opened Apr 14, 2023 by tmandry
1 of 25 tasks
9
Unexpected higher-ranked lifetime error in GAT usage A-async-await Area: Async & Await A-coroutines Area: Coroutines A-GATs Area: Generic associated types (GATs) A-higher-ranked Area: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs) A-lifetimes Area: Lifetimes / regions AsyncAwait-Triaged Async-await issues that have been triaged during a working group meeting. C-bug Category: This is a bug. S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. T-types Relevant to the types team, which will review and decide on the PR/issue.
#100013 opened Aug 1, 2022 by ethe
@jackh726
29
Generators should be able to yield references to local variables A-coroutines Area: Coroutines
#98740 opened Jun 30, 2022 by M1cha
3
Incorrect "implementation of Send is not general enough" error with lifetimed Send impl used in async fn A-async-await Area: Async & Await A-coroutines Area: Coroutines AsyncAwait-Triaged Async-await issues that have been triaged during a working group meeting. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#96865 opened May 9, 2022 by SabrinaJewson
11
MIR generation for generators considers any borrowed or assigned value as live across yield points A-borrow-checker Area: The borrow checker A-coroutines Area: Coroutines A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-enhancement Category: An issue proposing an enhancement or a PR with one.
#94067 opened Feb 16, 2022 by eholk
3
2
Which MIR passes should run on generator drop shims? A-coroutines Area: Coroutines A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#91576 opened Dec 6, 2021 by ecstatic-morse
@tmiasko
3
Inline generators before state machine conversion in order to reduce branching A-coroutines Area: Coroutines A-mir-opt Area: MIR optimizations C-enhancement Category: An issue proposing an enhancement or a PR with one. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code.
#83101 opened Mar 14, 2021 by pcwalton
Tracking issue for generator code quality A-async-await Area: Async & Await A-coroutines Area: Coroutines A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. AsyncAwait-Triaged Async-await issues that have been triaged during a working group meeting. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-heavy Issue: Problems and improvements with respect to binary size of generated code. I-slow Issue: Problems and improvements with respect to performance of generated code. metabug Issues about issues themselves ("bugs about bugs") T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#71407 opened Apr 21, 2020 by tmandry
1 task
3
[codegen] unnecessary panicking branch in foo().await (vs equivalent FutureImpl.await) A-async-await Area: Async & Await A-codegen Area: Code generation A-coroutines Area: Coroutines A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. AsyncAwait-Triaged Async-await issues that have been triaged during a working group meeting. C-enhancement Category: An issue proposing an enhancement or a PR with one. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-heavy Issue: Problems and improvements with respect to binary size of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#71093 opened Apr 13, 2020 by japaric
3
Tracking Issue for Coroutine Memory Usage A-async-await Area: Async & Await A-codegen Area: Code generation A-coroutines Area: Coroutines AsyncAwait-Triaged Async-await issues that have been triaged during a working group meeting. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such F-coroutines `#![feature(coroutines)]` I-heavy Issue: Problems and improvements with respect to binary size of generated code. metabug Issues about issues themselves ("bugs about bugs") T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#69826 opened Mar 8, 2020 by jonas-schievink
2 of 7 tasks
4
Tracking issue for more precise coroutine captures A-async-await Area: Async & Await A-coroutines Area: Coroutines A-type-system Area: Type system AsyncAwait-Triaged Async-await issues that have been triaged during a working group meeting. C-enhancement Category: An issue proposing an enhancement or a PR with one. E-hard Call for participation: Hard difficulty. Experience needed to fix: A lot. 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.
#69663 opened Mar 3, 2020 by tmandry
6 of 7 tasks
@rustbot
6
Yield reference in coroutine with GAT A-associated-items Area: Associated items (types, constants & functions) A-coroutines Area: Coroutines A-GATs Area: Generic associated types (GATs) C-feature-request Category: A feature request, i.e: not implemented / a PR. F-coroutines `#![feature(coroutines)]` GATs-triaged Issues using the `generic_associated_types` feature that have been triaged T-lang Relevant to the language team, which will review and decide on the PR/issue.
#69268 opened Feb 18, 2020 by cynecx
1
Coroutines should be able to implement for<'a> Coroutine<&'a mut T> A-coroutines Area: Coroutines C-enhancement Category: An issue proposing an enhancement or a PR with one. F-coroutines `#![feature(coroutines)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#68923 opened Feb 7, 2020 by jonas-schievink
15
Strange cycles perfomance with generators and very slow for in debug build [on nightly] A-coroutines Area: Coroutines C-enhancement Category: An issue proposing an enhancement or a PR with one. I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#67175 opened Dec 9, 2019 by olegnn
Lifetime bounds in auto trait impls prevent trait from being implemented on generators A-async-await Area: Async & Await A-coroutines Area: Coroutines A-trait-system Area: Trait system AsyncAwait-Triaged Async-await issues that have been triaged during a working group meeting. C-bug Category: This is a bug. P-medium Medium priority 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.
#64552 opened Sep 17, 2019 by leo60228
1
@oli-obk
20
Resolve unsound interaction between noalias and self-referential data (incl. generators, async fn) A-async-await Area: Async & Await A-coroutines Area: Coroutines AsyncAwait-Triaged Async-await issues that have been triaged during a working group meeting. C-bug Category: This is a bug. I-unsound Issue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness T-lang Relevant to the language team, which will review and decide on the PR/issue.
#63818 opened Aug 22, 2019 by Mark-Simulacrum
50
Async fn doubles argument size A-async-await Area: Async & Await A-coroutines Area: Coroutines AsyncAwait-Triaged Async-await issues that have been triaged during a working group meeting. C-enhancement Category: An issue proposing an enhancement or a PR with one. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-heavy Issue: Problems and improvements with respect to binary size of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#62958 opened Jul 24, 2019 by 4teap
8
Copy trait defeats generator optimization A-coroutines Area: Coroutines C-enhancement Category: An issue proposing an enhancement or a PR with one. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-heavy Issue: Problems and improvements with respect to binary size of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#62952 opened Jul 24, 2019 by tmandry
2
ProTip! no:milestone will show everything without a milestone.