static <A extends Iterable> A pnlReversed(S prefix default "", A l) {
  if (l != null) {
    L<A> list = reversed(l);
    int i = l(list);
    for (O a : list)
      print(prefix + (i--) + ". " + str(a));
  }
  ret l;
}

Began life as a copy of #1007684