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Unsoundness due to 'static coroutines that yield non-'static values.

A-coroutinesArea: CoroutinesArea: Coroutines

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

C-bugCategory: This is a bug.Category: This is a bug.

F-coroutines`#![feature(coroutines)]``#![feature(coroutines)]`

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

T-typesRelevant 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-coroutinesArea: CoroutinesArea: Coroutines

C-cleanupCategory: PRs that clean code up or issues documenting cleanup.Category: PRs that clean code up or issues documenting cleanup.

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

T-typesRelevant 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-coroutinesArea: CoroutinesArea: Coroutines

C-enhancementCategory: 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

Coroutine/Future <code>Send</code> bounds are too restrictive when taking references to <code>!Sync</code> values

A-coroutinesArea: CoroutinesArea: Coroutines

C-bugCategory: This is a bug.Category: This is a bug.

E-needs-investigationCall for partcipation: This issues needs some investigation to determine current statusCall for partcipation: This issues needs some investigation to determine current status

T-compilerRelevant 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-langRelevant to the language teamRelevant to the language team

WG-asyncWorking group: Async & awaitWorking 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-awaitArea: Async & AwaitArea: Async & Await

A-coroutinesArea: CoroutinesArea: Coroutines

AsyncAwait-TriagedAsync-await issues that have been triaged during a working group meeting.Async-await issues that have been triaged during a working group meeting.

C-bugCategory: This is a bug.Category: This is a bug.

T-compilerRelevant 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-coroutinesArea: CoroutinesArea: Coroutines

C-bugCategory: 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-mediumMedium priorityMedium priority

regression-untriagedUntriaged performance or correctness regression.Untriaged performance or correctness regression.

S-has-mcveStatus: A Minimal Complete and Verifiable Example has been found for this issueStatus: A Minimal Complete and Verifiable Example has been found for this issue

T-compilerRelevant 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-coroutinesArea: CoroutinesArea: Coroutines

A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lints

F-coroutines`#![feature(coroutines)]``#![feature(coroutines)]`

S-waiting-on-authorStatus: 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-compilerRelevant 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-awaitArea: Async & AwaitArea: Async & Await

A-coroutinesArea: CoroutinesArea: Coroutines

AsyncAwait-TriagedAsync-await issues that have been triaged during a working group meeting.Async-await issues that have been triaged during a working group meeting.

T-compilerRelevant 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-typesRelevant 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-awaitArea: Async & AwaitArea: Async & Await

A-auto-traitsArea: auto traits (e.g., `auto trait Send {}`)Area: auto traits (e.g., `auto trait Send {}`)

A-coroutinesArea: CoroutinesArea: Coroutines

AsyncAwait-TriagedAsync-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-assumptionsFixed by `-Zhigher-ranked-assumptions`Fixed by `-Zhigher-ranked-assumptions`

T-compilerRelevant 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-typesRelevant 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-asyncWorking group: Async & awaitWorking 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-awaitArea: Async & AwaitArea: Async & Await

A-coroutinesArea: CoroutinesArea: Coroutines

A-GATsArea: Generic associated types (GATs)Area: Generic associated types (GATs)

A-higher-rankedArea: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs)Area: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs)

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

AsyncAwait-TriagedAsync-await issues that have been triaged during a working group meeting.Async-await issues that have been triaged during a working group meeting.

C-bugCategory: This is a bug.Category: This is a bug.

fixed-by-higher-ranked-assumptionsFixed by `-Zhigher-ranked-assumptions`Fixed by `-Zhigher-ranked-assumptions`

S-bug-has-testStatus: 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-typesRelevant 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-coroutinesArea: CoroutinesArea: Coroutines

Status: Open.

#98740 In rust-lang/rust;

· M1cha opened on Jun 30, 2022

Incorrect "implementation of <code>Send</code> is not general enough" error with lifetimed <code>Send</code> impl used in <code>async fn</code>

A-async-awaitArea: Async & AwaitArea: Async & Await

A-coroutinesArea: CoroutinesArea: Coroutines

AsyncAwait-TriagedAsync-await issues that have been triaged during a working group meeting.Async-await issues that have been triaged during a working group meeting.

C-bugCategory: This is a bug.Category: This is a bug.

T-compilerRelevant 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.

#96865 In rust-lang/rust;

· SabrinaJewson opened on May 9, 2022