@Override
      public boolean hasNext() {
        /*
         * Don't store a new Iterator until we know the user can't remove() the last returned
         * element anymore. Otherwise, when we remove from the old iterator, we may be invalidating
         * the new one. The result is a ConcurrentModificationException or other bad behavior.
         *

    assertTrue(changed);
  }

  public void testAddAllToSet() {
    Set<String> alreadyThere = new LinkedHashSet<>(asList("already", "there"));
    List<String> oneMore = Lists.newArrayList("there");

    boolean changed = Iterators.addAll(alreadyThere, oneMore.iterator());
    assertThat(alreadyThere).containsExactly("already", "there").inOrder();
    assertFalse(changed);
  }

  @J2ktIncompatible

    assertTrue(changed);
  }

  public void testAddAllToSet() {
    Set<String> alreadyThere = new LinkedHashSet<>(asList("already", "there"));
    List<String> oneMore = Lists.newArrayList("there");

    boolean changed = Iterators.addAll(alreadyThere, oneMore.iterator());
    assertThat(alreadyThere).containsExactly("already", "there").inOrder();
    assertFalse(changed);
  }

  @J2ktIncompatible