Diagnostics incorrectly states that async closure implements `Fn`.

[theemathas]

Code

fn main() {
    let a = 0;
    async move || {
        require_static(&a);
    };
}

fn require_static(_: &'static i32) {}

Current output

error: lifetime may not live long enough
 --> src/main.rs:3:19
  |
3 |       async move || {
  |  _____-------------_^
  | |     |
  | |     lifetime `'1` represents this closure's body
4 | |         require_static(&a);
5 | |     };
  | |_____^ returning this value requires that `'1` must outlive `'static`
  |
  = note: closure implements `Fn`, so references to captured variables can't escape the closure

Desired output

Rationale and extra context

This async closure does not implement Fn.

Other cases

Rust Version

Reproducible on the playground with version 1.93.0-nightly (2025-11-01 bd3ac0330018c23b111b)

Anything else?

No response