boxed computation

import scala.language.implicitConversions

object Lazy {
  class Lazy[T](r: => T) extends Function0[T] {
    lazy val result = r

    def apply(): T = {
      result
    }

    // This doesn't work...
    // def `match`[R](body: T => R):R = {result match body}
  }

  implicit def unbox[T](box: Lazy[T]): T = box()
  def apply[T](r: => T) = new Lazy(r)

}