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error: future cannot be sent between threads safely
--> $DIR/issue-71137.rs:22:14
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LL | fake_spawn(wrong_mutex());
| ^^^^^^^^^^^^^ future returned by `wrong_mutex` is not `Send`
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= help: within `impl Future<Output = ()>`, the trait `Send` is not implemented for `MutexGuard<'_, i32>`
note: future is not `Send` as this value is used across an await
--> $DIR/issue-71137.rs:14:26
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LL | let mut guard = m.lock().unwrap();
| --------- has type `MutexGuard<'_, i32>` which is not `Send`
LL | (async { "right"; }).await;
| ^^^^^ await occurs here, with `mut guard` maybe used later
LL | *guard += 1;
LL | }
| - `mut guard` is later dropped here
note: required by a bound in `fake_spawn`
--> $DIR/issue-71137.rs:8:27
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LL | fn fake_spawn<F: Future + Send + 'static>(f: F) { }
| ^^^^ required by this bound in `fake_spawn`
error: aborting due to previous error
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