scala-abstract-extension-method.md

  implicit class TryWithForNot[T](t: Try[T]) {
    def fornot[A](f: Throwable => A): Unit = ???
  }

  implicit class SuccessWithForNot[T](success: Success[T]) {
    def fornot[A](f: Throwable => A): Unit = ()
  }

  implicit class FailureWithForNot[T](failure: Failure[T]) {
    def fornot[A](f: Throwable => A): Unit = {
      f(failure.exception)
      ()
    }
  }