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error: future cannot be sent between threads safely
--> $DIR/send-not-implemented.rs:8:26
|
8 | async fn test(&self) {
| __________________________^
9 | | let mutex = Mutex::new(());
10 | | let _guard = mutex.lock().unwrap();
11 | | f().await;
12 | | }
| |_____^ future returned by `__test` is not `Send`
|
= help: within `impl Future`, the trait `Send` is not implemented for `MutexGuard<'_, ()>`
note: future is not `Send` as this value is used across an await
--> $DIR/send-not-implemented.rs:11:9
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10 | let _guard = mutex.lock().unwrap();
| ------ has type `MutexGuard<'_, ()>` which is not `Send`
11 | f().await;
| ^^^^^^^^^ await occurs here, with `_guard` maybe used later
12 | }
| - `_guard` is later dropped here
= note: required for the cast to the object type `dyn Future<Output = ()> + Send`
|
