error: conflicting associated type bounds for `Item`
  --> $DIR/associated-types-overridden-binding-2.rs:6:13
   |
LL | trait I32Iterator = Iterator<Item = i32>;
   |                              ---------- `Item` is specified to be `i32` here
...
LL |     let _: &dyn I32Iterator<Item = u32> = &vec![42].into_iter();
   |             ^^^^^^^^^^^^^^^^----------^
   |                             |
   |                             `Item` is specified to be `u32` here

error: aborting due to 1 previous error