For patrick

gistfile1.scala

trait Block[T] extends Function1[String, T]

object Block {
  implicit def functionBlock[T](f: String => T): Block[T] = new Block[T] {
    def apply(s: String): T = f(s)
  }
  implicit val unitBlock: Block[Unit] = new Block[Unit] {
    def apply(s: String): Unit = {}
  }
}

object A {
  def get[T](uri: String)(implicit block: Block[T]): T = {
    println("before...")
    val result = block(uri.reverse)
    println("after...")
    result
  }

  val result = get("http") {
    r: String => println(r); 42
  }

  val result1 = get("http")
}