| error[E0271]: expected `foo` to be a fn item that returns `i32`, but it returns `()` | |
| --> $DIR/issue-106991.rs:5:13 | |
| | | |
| LL | fn bar() -> impl Iterator<Item = i32> { | |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found `i32` | |
| | | |
| = note: required for `Map<std::slice::IterMut<'_, Vec<u8>>, for<'a> fn(&'a mut Vec<u8>) {foo}>` to implement `Iterator` | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0271`. |