class Queue[+A](elem: A*) {
    protected val in:List[A] = Nil;
    protected val out = elem as List[A];

    protected def mkQueue[A](i:List[A], o:List[A]):Queue[A] = {
	new Queue[A](){
	    override protected val in = i;
	    override protected val out = o
	};
    }

    def +[B >: A](elem: B) = {
	mkQueue(elem::in,out);
    }
}


object Test {
  def main(args: Array[String]): Unit = {
    val q = new Queue();
    val q2 = q + 42 + 0;	

    ();
  }
}