LL | | }) as Box<dyn FnMut()>);
| |______^ expected `()`, found `!`
|
- = note: expected type `()`
- found type `!`
- = note: required for the cast to the object type `dyn FnMut()`
+ = note: expected unit type `()`
+ found type `!`
+ = note: required for the cast from `[closure@$DIR/fallback-closure-wrap.rs:18:40: 21:6]` to the object type `dyn FnMut()`
error: aborting due to previous error