static bool tok_hasClassRef2(L<S> tok, S className) {
  int n = l(tok);
  int level = 0;
  for (int i = 1; i < n; i += 2) {
    S t = tok.get(i);
    if (eqOneOf(t, "ifclass", "ifndef")) ++level;
    else if (eqOneOf(t, "endif", "endifndef")) --level;
    else if (level <= 0 && eq(t, className)) true;
  }
  false;
}