final class Order private() {
  class OrderLine(x: Int) { }
 
  def this(makeOrderLines: { def apply(order: Order): Seq[order.OrderLine] }) = {
    this()
    orderLines = makeOrderLines(this)
  }
 
  // TODO: Private setter.
  var orderLines: Seq[OrderLine] = null
}
 
object Main extends App {
  val order = new Order(new {
    def apply(order: Order) =
      Seq(new order.OrderLine(1), new order.OrderLine(2))
  })
  println(order.orderLines)
}
 

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