}
  }

  /** List decorator that stays in sync with the multimap values for a key. */
  @WeakOuter
  private class WrappedList extends WrappedCollection implements List<V> {
    WrappedList(@ParametricNullness K key, List<V> delegate, @Nullable WrappedCollection ancestor) {
      super(key, delegate, ancestor);
    }

    List<V> getListDelegate() {