Here is a strawman program which illustrates the issue I am having

trait RequestBuilder {
  type Out

  def complete(p: Promise[Out]): Unit
}

def makeRequest(in: RequestBuilder): Source[(RequestBuilder, Promise[in.Out]), 
Future[in.Out]] = {
  val p = Promise[in.Out]

  Source.single(in -> p).mapMaterializedValue(_ => p.future)
}

val sink = MergeHub.source[(RequestBuilder, Promise[???])].to(Sink.foreach {
  case (r, p) => r.complete(p)
}).run()

sink.runWith(makeRequest(new RequestBuilder {
  type Out = Int

  def complete(p: Promise[Out]): Unit = p.success(1)
}))


The issue is, how do I type the Promise[???]  in the sink? I have been able 
to work around this by making the Promise a part of the RequestBuilder 
trait itself, but this seems like a code smell to me

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