static <A> L<A> wrapAsVirtualReversedList(A[] array) {
  int n = l(array);
  ret new RandomAccessAbstractList<A> {
    public int size() { ret n; }
    public A get(int i) { ret array[n-1-i]; }
    public A set(int i, A a) {
      A old = array[n-1-i];
      array[n-1-i] = a;
      ret old;
    }
  };
}