| error[E0271]: expected `foo` to return `i32`, but it returns `()` |
| --> $DIR/issue-106991.rs:5:13 |
| | |
| LL | fn bar() -> impl Iterator<Item = i32> { |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^ expected `i32`, found `()` |
| ... |
| LL | x.iter_mut().map(foo) |
| | --------------------- return type was inferred to be `Map<std::slice::IterMut<'_, Vec<u8>>, for<'a> fn(&'a mut Vec<u8>) {foo}>` here |
| | |
| = 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`. |
