static L<S> replaceSubList(L<S> l, L<S> x, L<S> y) {
  ret replaceSublist(l, x, y);
}

static <A> L<A> replaceSubList(L<A> l, int fromIndex, int toIndex, L<A> y) {
  ret replaceSublist(l, fromIndex, toIndex, y);
}