error: defining opaque type use does not fully define opaque type: generic parameter `I` is specified as concrete type `u8`
  --> $DIR/issue-60564.rs:20:5
   |
LL | /     fn iter_bits(self, n: u8) -> Self::BitsIter {
LL | |
LL | |         (0u8..n)
LL | |             .rev()
LL | |             .map(move |shift| ((self >> T::from(shift)) & T::from(1)).try_into().unwrap())
LL | |     }
   | |_____^

error: could not find defining uses
  --> $DIR/issue-60564.rs:8:1
   |
LL | type IterBitsIter<T, E, I> = impl std::iter::Iterator<Item = I>;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors