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rustdoc: support for async Fn* trait bounds #127227

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rustdoc: support for async Fn* trait bounds#127227
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A-async-closures`async || {}`C-bugCategory: This is a bug.F-async_trait_bounds`#![feature(async_trait_bounds]`T-rustdocRelevant to the rustdoc team, which will review and decide on the PR/issue.requires-nightlyThis issue requires a nightly compiler in some way. When possible, use a F-* label instead.

Description

@fmease
fmease
opened on Jul 1, 2024

Source:

#![feature(async_closure)]

pub fn demo(_: impl async Fn() -> i32) {}

Current rendered output (local, etc. — more generally: HIR-based) below (issue: dropping the trait bound modifier async).

pub fn demo(_: impl Fn() -> i32)

Current rendered output (inlined cross-crate re-export, etc. — more generally: middle-based) below (issue: leaking the internal desugaring):

pub fn demo(_: impl AsyncFn<(), Output = i32>)

Tracking:

Activity

  1. fmease
    added
    T-rustdocRelevant to the rustdoc team, which will review and decide on the PR/issue.
    C-bugCategory: This is a bug.
    A-async-closures`async || {}`
    on Jul 1, 2024
  2. rustbot
    added
    needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging
    on Jul 1, 2024
  3. fmease
    removed
    needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging
    on Jul 1, 2024

  4. fmease commented on Jul 1, 2024

    @fmease
    fmease
    on Jul 1, 2024
    MemberAuthor

    I consider this issue to be partially blocked: Please don't try to add async Fn* support for inlined cross-crate reexports — more generally: middle-based cleaning — before I fix #113015 (which should happen very soon!).

  5. fmease commented on Jul 12, 2024

    @fmease
    fmease
    on Jul 12, 2024
    MemberAuthor

    Blocking this on for<> async vs. async for<>: #127054 (in lang-FCP-merge)
    @rustbot blocked

  6. rustbot commented on Jul 12, 2024

    @rustbot
    rustbot
    on Jul 12, 2024 · Hidden as resolved
  7. fmease
    added
    S-blockedStatus: Blocked on something else such as an RFC or other implementation work.
    on Jul 12, 2024
  8. bors
    added a commit that references this issue on Dec 13, 2024

    Auto merge of rust-lang#132706 - compiler-errors:async-closures, r=ol…

    f4f0faf
  9. github-actions
    added a commit that references this issue on Dec 13, 2024

    Auto merge of #132706 - compiler-errors:async-closures, r=oli-obk

    e00fc81
  10. fmease
    added
    P-lowLow priority
    requires-nightlyThis issue requires a nightly compiler in some way. When possible, use a F-* label instead.
    F-async_trait_bounds`#![feature(async_trait_bounds]`
    and removed
    P-lowLow priority
    S-blockedStatus: Blocked on something else such as an RFC or other implementation work.
    on Aug 8, 2025
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    A-async-closures`async || {}`C-bugCategory: This is a bug.F-async_trait_bounds`#![feature(async_trait_bounds]`T-rustdocRelevant to the rustdoc team, which will review and decide on the PR/issue.requires-nightlyThis issue requires a nightly compiler in some way. When possible, use a F-* label instead.

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