`_` replacement suggestion when returning async closures is broken

[cyrgani]

Code

fn ord() -> _ {
    async || {}
}

Current output

error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types
 --> src/lib.rs:1:13
  |
1 | fn ord() -> _ {
  |             ^ not allowed in type signatures
  |
help: replace with the correct return type
  |
1 - fn ord() -> _ {
1 + fn ord() -> {async closure@src/lib.rs:2:5: 2:13} {
  |

Desired output

error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types
 --> src/lib.rs:1:13
  |
1 | fn ord() -> _ {
  |             ^ not allowed in type signatures
  |
help: replace with the correct return type
  |
1 - fn ord() -> _ {
1 + fn ord() -> impl AsyncFn() {
  |

Rationale and extra context

This works correctly if you remove either async or ||.
Found from #148488.

Other cases

Rust Version

Nightly version: 1.93.0-nightly

(2025-11-03 20383c9f1d84eb9b9c66)

Anything else?

No response