static <A> L<A> subList(L<A> l, int startIndex) {
  ret subList(l, startIndex, l(l));
}

static <A> L<A> subList(L<A> l, int startIndex, int endIndex) {
  startIndex = max(0, min(l(l), startIndex));
  endIndex = max(0, min(l(l), endIndex));
  if (startIndex > endIndex) ret litlist();
  ret l.subList(startIndex, endIndex);
}