sbool codeTokensEqualICAtIndex(LS tok, LS patternCodeTokens, int idx) {
  int end = idx+l(patternCodeTokens)*2, n = l(tok);
  if (end > n) false;
  for (int i = idx; i < end; i += 2)
    if (!eqic(tok.get(i), patternCodeTokens.get((i-idx)/2)))
      false;
  true;
}