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error[E0271]: expected `foo` to return `i32`, but it returns `()`
--> $DIR/issue-106991.rs:5:13
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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
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= 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`.
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