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error: future cannot be sent between threads safely
  --> $DIR/issue-67252-unnamed-future.rs:21:11
   |
LL |       spawn(async {
   |  ___________^
LL | |         let a = std::ptr::null_mut::<()>(); // `*mut ()` is not `Send`
LL | |         AFuture.await;
LL | |         drop(a);
LL | |     });
   | |_____^ future created by async block is not `Send`
   |
   = help: within `[async block@$DIR/issue-67252-unnamed-future.rs:21:11: 25:6]`, the trait `Send` is not implemented for `*mut ()`
note: future is not `Send` as this value is used across an await
  --> $DIR/issue-67252-unnamed-future.rs:23:17
   |
LL |         let a = std::ptr::null_mut::<()>(); // `*mut ()` is not `Send`
   |             - has type `*mut ()` which is not `Send`
LL |         AFuture.await;
   |                 ^^^^^ await occurs here, with `a` maybe used later
LL |         drop(a);
LL |     });
   |     - `a` is later dropped here
note: required by a bound in `spawn`
  --> $DIR/issue-67252-unnamed-future.rs:9:13
   |
LL | fn spawn<T: Send>(_: T) {}
   |             ^^^^ required by this bound in `spawn`

error: aborting due to previous error