error: `MutexGuard` held across a suspend point, but should not be
  --> $DIR/mutex.rs:7:9
   |
LL |     let _guard = m.lock().unwrap();
   |         ^^^^^^
LL |     other().await;
   |     ------------- the value is held across this suspend point
   |
note: the lint level is defined here
  --> $DIR/mutex.rs:2:9
   |
LL | #![deny(must_not_suspend)]
   |         ^^^^^^^^^^^^^^^^
note: Holding a MutexGuard across suspend points can cause deadlocks, delays, and cause Future's to not implement `Send`
  --> $DIR/mutex.rs:7:9
   |
LL |     let _guard = m.lock().unwrap();
   |         ^^^^^^
help: consider using a block (`{ ... }`) to shrink the value's scope, ending before the suspend point
  --> $DIR/mutex.rs:7:9
   |
LL |     let _guard = m.lock().unwrap();
   |         ^^^^^^

error: aborting due to previous error