static <A> bool subListContains(L<A> l, int startIndex, int endIndex, A a) {
  if (l == null) false;
  int n = l.size();
  startIndex = Math.max(0, startIndex);
  endIndex = Math.min(n, endIndex);
  for (int i = startIndex; i < endIndex; i++)
    if (eq(a, l.get(i)))
      true;
  false;
}

Began life as a copy of #1002310