static <A> ItIt<ParsedWithTokens<A>> pwt_toTheRightOf(Iterable<ParsedWithTokens<A>> l, ParsedWithTokens b) {
  ret filterI(iterator(l), p -> {
    print("ttro: " + p.iStart + " / " + b.iRemaining);
    ret p.iStart == b.iRemaining;
  });
}