static <A, B> L<B> lambdaMapLike lazyMap_noSave(IF1<A, B> f, L<A> l) {
  ret new RandomAccessAbstractList<B> {
    final int size = l(l);

    public int size() { ret size; }
    public B get(int i) {
      ret f.get(l.get(i));
    }
  };
}