error[E0277]: `MutexGuard<'_, ()>` cannot be sent between threads safely
  --> $DIR/issue-67893.rs:9:5
   |
LL |     g(issue_67893::run())
   |     ^ `MutexGuard<'_, ()>` cannot be sent between threads safely
   |
  ::: $DIR/auxiliary/issue_67893.rs:7:20
   |
LL | pub async fn run() {
   |                    - within this `impl Future`
   |
   = help: within `impl Future`, the trait `Send` is not implemented for `MutexGuard<'_, ()>`
   = note: required because it appears within the type `for<'r, 's, 't0, 't1, 't2, 't3> {ResumeTy, Arc<Mutex<()>>, &'r Mutex<()>, Result<MutexGuard<'s, ()>, PoisonError<MutexGuard<'t0, ()>>>, &'t1 MutexGuard<'t2, ()>, MutexGuard<'t3, ()>, (), impl Future}`
   = note: required because it appears within the type `[static generator@run::{closure#0}]`
   = note: required because it appears within the type `from_generator::GenFuture<[static generator@run::{closure#0}]>`
   = note: required because it appears within the type `impl Future`
   = note: required because it appears within the type `impl Future`
note: required by a bound in `g`
  --> $DIR/issue-67893.rs:6:14
   |
LL | fn g(_: impl Send) {}
   |              ^^^^ required by this bound in `g`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.