Small silly cake

cake.scala

trait Service {
  def host: String
  def port: Int
}

trait GoogleServiceModule extends Service {
  val host = "google.com"
  val port = 80
}

trait BingServiceModule extends Service {
  val host = "bing.com"
  val port = 80
}

trait FooModule {
  type bar <: BarLike
  trait BarLike { _: Service =>
    def connect = println {
      s"Connecting to $host:$port"
    }  
  }
}

object EndOfAll 
  extends FooModule {

  object bar 
    extends BarLike
       with BingServiceModule // or with GoogleServiceModule

}