Prototype pattern (Design Patterns in Scala)

Prototype.scala

@cloneable
class Command(value: Int, name: String) {
  override def clone = super.clone
  override def toString = value + ": " + name
}

object Main {
  def main(args: Array[String]) = {
    val com1 = new Command(1, "Hoge")
    val com2 = com1.clone

    println(com1)
    println(com2)
    println(com1 eq com2)
  }
}

Does not work, may it's for some old version of scala.