Scalaz Reader of Configuration

reader-config.scala

import scalaz.Reader

case class Configuration(hostname: String, port: Int, file: String)
case class ServerConnection(host: String, port: Int, file: String)

val config = Configuration("localhost", 8080, "index.html")

def configReader[A](f: Configuration => A): Reader[Configuration, A] = Reader { f }

val conn: scalaz.Kleisli[scalaz.Id.Id, Configuration, ServerConnection] = for {
            h <- configReader { _.hostname }
            p <- configReader { _.port }
            o <- configReader { _.file }
        } yield ServerConnection(h, p, o)

val serverConn = conn.run(config) // conn(config)