// warning: match may not be exhaustive. It would fail on the following inputs: Error(_, _), Failure(_, _)
parse(freq, "johnny 121") match {
 case Success(matched,_) => println(matched)
 case NoSuccess(msg,_) => println(s"NoSuccess: $msg")
 }

 object NoSuccess {
 def unapply(x: NoSuccess) = x match {
 case Failure(msg, next) => Some((msg, next))
 case Error(msg, next) => Some((msg, next))
 }
 }