static void nlLogic_iterate_withOnFail(final NLLogicChecker_v2 c, Exp e, final NLLogicChecker_v2.Matching m, final Runnable onMatch, final VF1<Exp> onFail) {
  final new Flag anyResults;
  
  if (e cast And) {
    final Exp b = e.b;
    c.iterate_single(e.a, m, r {
      anyResults.raise();
      nlLogic_iterate_withOnFail(c, b, m, onMatch, onFail)
    });
  } else
    c.iterate_single(e, m, r {
      anyResults.raise();
      callF(onMatch);
    });
    
  if (!anyResults.isUp())
    callF(onFail, e);
}