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Draft release notes for 1.91
#147010 ·
Mark-Simulacrum
opened
on Sep 25, 2025
19
Issues
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state
:
open
label
:
A-coroutines
state:open label:A-coroutines
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Open
Closed
Unsoundness due to 'static coroutines that yield non-'static values.
A-coroutines
Area: Coroutines
Area: Coroutines
A-lifetimes
Area: Lifetimes / regions
Area: Lifetimes / regions
C-bug
Category: This is a bug.
Category: This is a bug.
F-coroutines
`#![feature(coroutines)]`
`#![feature(coroutines)]`
I-unsound
Issue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness
Issue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness
requires-nightly
This issue requires a nightly compiler in some way.
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.
Relevant to the types team, which will review and decide on the PR/issue.
Status: Open.
#144442
In rust-lang/rust;
·
theemathas
opened
on Jul 25, 2025
Tracking issue to remove <code>TyKind::CoroutineWitness</code> from the type system
A-coroutines
Area: Coroutines
Area: Coroutines
C-cleanup
Category: PRs that clean code up or issues documenting cleanup.
Category: PRs that clean code up or issues documenting cleanup.
C-tracking-issue
Category: An issue tracking the progress of sth. like the implementation of an RFC
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.
Relevant to the types team, which will review and decide on the PR/issue.
Status: Open.
#143017
In rust-lang/rust;
·
compiler-errors
opened
on Jun 25, 2025
[E0521] coroutine should own upvars and assigning internal references to moved captures does not leak the references
A-coroutines
Area: Coroutines
Area: Coroutines
C-enhancement
Category: An issue proposing an enhancement or a PR with one.
Category: An issue proposing an enhancement or a PR with one.
F-coroutines
`#![feature(coroutines)]`
`#![feature(coroutines)]`
Status: Open.
#140132
In rust-lang/rust;
·
dingxiangfei2009
opened
on Apr 21, 2025
Initial <code>UnsafePinned</code> implementation [Part 2: Lowering]
A-coroutines
Area: Coroutines
Area: Coroutines
F-coroutines
`#![feature(coroutines)]`
`#![feature(coroutines)]`
F-unsafe_pinned
`#![feature(unsafe_pinned)]`
`#![feature(unsafe_pinned)]`
S-waiting-on-author
Status: This is awaiting some action (such as code changes or more information) from the 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.
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)
The Rustc Trait System Refactor Initiative (-Znext-solver)
Status: Draft (not ready).
rust-lang/rust
number 139896
#139896
In rust-lang/rust;
·
Sky9x
opened
on Apr 16, 2025
Coroutine/Future <code>Send</code> bounds are too restrictive when taking references to <code>!Sync</code> values
A-coroutines
Area: Coroutines
Area: Coroutines
C-bug
Category: This is a bug.
Category: This is a bug.
E-needs-investigation
Call for partcipation: This issues needs some investigation to determine current status
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.
Relevant to the compiler team, which will review and decide on the PR/issue.
T-lang
Relevant to the language team
Relevant to the language team
WG-async
Working group: Async & await
Working group: Async & await
Status: Open.
#132382
In rust-lang/rust;
·
ds84182
opened
on Oct 31, 2024
rustc fails to prove <code>Send</code>ness for an <code>async</code> block where a <code>!Send</code> value is dropped before an <code>.await</code> point
A-async-await
Area: Async & Await
Area: Async & Await
A-coroutines
Area: Coroutines
Area: Coroutines
AsyncAwait-Triaged
Async-await issues that have been triaged during a working group meeting.
Async-await issues that have been triaged during a working group meeting.
C-bug
Category: This is a bug.
Category: This is a bug.
T-compiler
Relevant 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.
#128095
In rust-lang/rust;
·
frank-king
opened
on Jul 23, 2024
regression on nightly-2024-03-16
A-coroutines
Area: Coroutines
Area: Coroutines
C-bug
Category: This is a bug.
Category: This is a bug.
F-coroutines
`#![feature(coroutines)]`
`#![feature(coroutines)]`
F-impl_trait_in_assoc_type
`#![feature(impl_trait_in_assoc_type)]`
`#![feature(impl_trait_in_assoc_type)]`
P-medium
Medium priority
Medium priority
regression-untriaged
Untriaged performance or correctness regression.
Untriaged performance or correctness regression.
S-has-mcve
Status: A Minimal Complete and Verifiable Example has been found for this issue
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.
Relevant to the compiler team, which will review and decide on the PR/issue.
Status: Open.
#122618
In rust-lang/rust;
·
xxchan
opened
on Mar 17, 2024
E0308 for coroutines kinda cryptic
A-coroutines
Area: Coroutines
Area: Coroutines
A-diagnostics
Area: Messages for errors, warnings, and lints
Area: Messages for errors, warnings, and lints
F-coroutines
`#![feature(coroutines)]`
`#![feature(coroutines)]`
S-waiting-on-author
Status: This is awaiting some action (such as code changes or more information) from the 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.
Relevant to the compiler team, which will review and decide on the PR/issue.
Status: Open.
#118954
In rust-lang/rust;
·
matthiaskrgr
opened
on Dec 14, 2023
"Implementation not general enough" with async and projection, fixed by wrapping with <code>async move</code>
A-async-await
Area: Async & Await
Area: Async & Await
A-coroutines
Area: Coroutines
Area: Coroutines
AsyncAwait-Triaged
Async-await issues that have been triaged during a working group meeting.
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.
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.
Relevant to the types team, which will review and decide on the PR/issue.
Status: Open.
#110339
In rust-lang/rust;
·
tmandry
opened
on Apr 14, 2023
Tracking issue for incorrect lifetime bound errors in async
A-async-await
Area: Async & Await
Area: Async & Await
A-auto-traits
Area: auto traits (e.g., `auto trait Send {}`)
Area: auto traits (e.g., `auto trait Send {}`)
A-coroutines
Area: Coroutines
Area: Coroutines
AsyncAwait-Triaged
Async-await issues that have been triaged during a working group meeting.
Async-await issues that have been triaged during a working group meeting.
fixed-by-higher-ranked-assumptions
Fixed by `-Zhigher-ranked-assumptions`
Fixed by `-Zhigher-ranked-assumptions`
T-compiler
Relevant 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-types
Relevant 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-async
Working group: Async & await
Working group: Async & await
Status: Open.
#110338
In rust-lang/rust;
·
tmandry
opened
on Apr 14, 2023
Unexpected higher-ranked lifetime error in GAT usage
A-async-await
Area: Async & Await
Area: Async & Await
A-coroutines
Area: Coroutines
Area: Coroutines
A-GATs
Area: Generic associated types (GATs)
Area: Generic associated types (GATs)
A-higher-ranked
Area: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs)
Area: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs)
A-lifetimes
Area: Lifetimes / regions
Area: Lifetimes / regions
AsyncAwait-Triaged
Async-await issues that have been triaged during a working group meeting.
Async-await issues that have been triaged during a working group meeting.
C-bug
Category: This is a bug.
Category: This is a bug.
fixed-by-higher-ranked-assumptions
Fixed by `-Zhigher-ranked-assumptions`
Fixed by `-Zhigher-ranked-assumptions`
S-bug-has-test
Status: This bug is tracked inside the repo by a `known-bug` 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.
Relevant to the types team, which will review and decide on the PR/issue.
Status: Open.
#100013
In rust-lang/rust;
·
ethe
opened
on Aug 1, 2022
Generators should be able to yield references to local variables
A-coroutines
Area: Coroutines
Area: Coroutines
Status: Open.
#98740
In rust-lang/rust;
·
M1cha
opened
on Jun 30, 2022
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