message: [pdsl_core] Extend test for <storage::Vec as Iterator>::size_hint slightly
diff: @@ -202,6 +202,8 @@ fn swap_remove_empty() {
  #[test]
  fn iter_size_hint() {
  let vec = new_filled_vec();
  - let iter = vec.iter();
  + let mut iter = vec.iter();
  assert_eq!(iter.size_hint(), (4, Some(4)));
  + iter.next();
  + assert_eq!(iter.size_hint(), (3, Some(3)));
  }
  