message: [pdsl_core] Add tests for <Vec as DoubleEndedIterator>::next_back
diff: @@ -68,6 +68,17 @@ fn iter() {
  assert_eq!(iter.next(), None);
  }
  +#[test]
  +fn iter_back() {
  + let vec = new_filled_vec();
  + let mut iter = vec.iter();
  + assert_eq!(iter.next_back(), Some(&77));
  + assert_eq!(iter.next_back(), Some(&1337));
  + assert_eq!(iter.next_back(), Some(&42));
  + assert_eq!(iter.next_back(), Some(&5));
  + assert_eq!(iter.next_back(), None);
  +}
  +
  #[test]
  fn get() {
  let vec = new_filled_vec();
  