sbool <A> subListEquals(L<A> l, L<A> pat, int i) {
  if (i < 0) false;
  int j = i+l(pat);
  if (j > l(l)) false;
  for (int k = i; k < j; k++)
    if (!eq(l.get(k), pat.get(k-i)))
      false;
  true;
}

sbool <A> subListEquals(L<A> l, int i, A... pat) {
  ret subListEquals(l, asVirtualList(pat), i);
}

Began life as a copy of #1022225