error[E0277]: the trait bound `*mut (): Trait<'_>` is not satisfied
  --> $DIR/issue-101623.rs:21:21
   |
LL |     Trait::do_stuff({ fun(&mut *inner) });
   |     --------------- ^^----------------^^
   |     |               |
   |     |               the trait `Trait<'_>` is not implemented for `*mut ()`
   |     required by a bound introduced by this call
   |
   = help: the trait `Trait<'_>` is implemented for `()`
   = help: for that trait implementation, expected `()`, found `*mut ()`

error: aborting due to 1 previous error

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