// TODO: base on AbstractList to speed up subList().clear()
abstract sclass NotifyingList<A> extends NotifyingCollection<A> implements L<A> {
  L<A> list;
  
  *() {} // for persistence
  *(List<A> list) {
    super(list);
    this.list = list;
  }
  
  public L<A> subList(int i, int j) { throw todo(); }
  
  !include #1012666
}