error: allocator `MyAllocatorWhichMustNotSuspend` held across a suspend point, but should not be
  --> $DIR/allocator.rs:24:9
   |
LL |     let x = Box::new_in(1i32, MyAllocatorWhichMustNotSuspend);
   |         ^
LL |
LL |     suspend().await;
   |               ----- the value is held across this suspend point
   |
help: consider using a block (`{ ... }`) to shrink the value's scope, ending before the suspend point
  --> $DIR/allocator.rs:24:9
   |
LL |     let x = Box::new_in(1i32, MyAllocatorWhichMustNotSuspend);
   |         ^
note: the lint level is defined here
  --> $DIR/allocator.rs:4:9
   |
LL | #![deny(must_not_suspend)]
   |         ^^^^^^^^^^^^^^^^

error: aborting due to 1 previous error