static int indexOfAnonymousClassInStruct(S s) {
  Pattern p = compileRegexp("\\$\\d");
  Producer<S> it = javaTokC_noMLS_iterator(s);
  S t;
  int idx = 0;
  while ((t = it.next()) != null) {
    if (isIdentifier(t) && regexpContains(p, t)) ret idx;
    idx += l(t);
  }
  ret -1;
}