Incorrect imports suggestion for code inside tokio::main

[Cerber-Ursi]

Given the following code:

#[tokio::main]
async fn main() {
    let _ = Duration::from_millis(97);
}

The current output is:

error[E0433]: failed to resolve: use of undeclared type `Duration`
 --> src/main.rs:3:13
  |
3 |     let _ = Duration::from_millis(97);
  |             ^^^^^^^^ not found in this scope
  |
help: consider importing one of these items
  |
2 | async use chrono::Duration;
  |       ^^^^^^^^^^^^^^^^^^^^^
2 | async use core::time::Duration;
  |       ^^^^^^^^^^^^^^^^^^^^^^^^^
2 | async use humantime::Duration;
  |       ^^^^^^^^^^^^^^^^^^^^^^^^
2 | async use instant::Duration;
  |       ^^^^^^^^^^^^^^^^^^^^^^
    and 5 other candidates

Note the async use bit, which is, obviously, invalid syntax.

[ehuss]

Thanks for the report!

Even fixing the async part won't be sufficient because the #[tokio::main] attribute is in the way, too. There is more discussion at #85312 (comment) and #85427 as to why that doesn't work.

[pnkfelix]

(This is probably fixed by proposed PR #90941.)

[Cerber-Ursi]

Just checked in playground - seems to be fixed for now, probably should be closed?

[ehuss]

Yea, I'm going to close as resolved by #94584.