val summed = for {
        resultOne: Int <- one
        resultTwo: Int <- two
      } yield {
        resultOne + resultTwo
      }

      val summed = for {
        resultOne <- one
        resultTwo <- two
      } yield {
        resultOne + resultTwo
      }

[error]... no type parameters for method apply: (value: T[Option[A]])(implicit m: com.example.monadT.Monad[T])com.example.monadT.OptionTransformer[T,A] in object OptionTransformer exist so that it can be applied to arguments (scala.concurrent.Future[Some[Int]])
[error]  --- because ---
[error] argument expression's type is not compatible with formal parameter type;
[error]  found   : scala.concurrent.Future[Some[Int]]
[error]  required: ?T[Option[?A]]
[error]       val one: OptionTransformer[Future, Int] = OptionTransformer(Future(Some(1)))

  val getFO: (Int) => Future[Option[Int]] = (in) => Future.successful(Some(in + 1))
  ...
  resultOne <- OptionTransformer(getFO(0))