sS ai_withTokenRefNumbers(L<TokenAndRange> tokens, Map<TokenAndRange> map) {
  Set<TokenAndRange> refd = valuesSet(map);
  int n = 0;
  new StringBuilder buf;
  new Map<TokenAndRange, Int> indices;
  for (TokenAndRange t : tokens) {
    buf.append(t.token);
    if (refd.contains(t)) {
      indices.put(t, ++n);
      buf.append(" [*" + n + "]");
    }
    TokenAndRange target = mapGet(map, t);
    if (target != null)
      buf.append(" [" + indices.get(target) + "]");
  }
  ret str(buf);
}