foo.scala

  implicit class EitherTCompanionExt(wrapper: scalaz.EitherT.type) {
    class PinnedEitherT[F[_]] {
      def apply[A,B](a: Future[A \/ B]): scalaz.EitherT[Future, A, B] = scalaz.EitherT[Future, A, B](a)
    }

    @inline def eitherTPinned[F[_]] = new PinnedEitherT[F]

    @inline def eitherTFuture[A, B](a: Future[A \/ B]): scalaz.EitherT[Future, A, B] = eitherTPinned[Future](a)
  }