Unchecked.scala

object Unchecked extends App {
  class Foo[A] {
    def doIt(o: Any): Option[A] = Some(o.asInstanceOf[A])
  }

  println(new Foo[String].doIt(3))
}

/* compile it */
//scalac Unchecked.scala

/* run it */
//scala Unchecked
//Some(3)