case class Node(name: String)
case class Leaf(value: String, node: Node)
case class InternalNode(children: List[Node], node: Node)

object Node {
  implicit val show = new Show[Node] {
    override def show(node: Node): String = s"(${node.name.show})"
  }
}

object Leaf {
  implicit val show = Show[Node].contramap[Leaf](_.node)
}

object InternalNode {
  implicit val show = Show[Node].contramap[Leaf](_.node)
}

println(Leaf("1488", Node("mynode")).show)