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final class Order private() {
  case 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({ (order: Order) =>
      Seq(order.OrderLine(1), order.OrderLine(2))
  })
  println(order.orderLines)
}
 

/opt/scala/bin/scalac: line 50: /dev/null: Permission denied
Main.scala:14: error: type mismatch;
 found   : Order => Seq[Order#OrderLine]
 required: AnyRef{def apply(order: Order): Seq[order.OrderLine]}
  val order = new Order({ (order: Order) =>
                                         ^
one error found
spoj: The program compiled successfully, but Main.class was not found.
      Class Main should contain method: def main(args: Array[String]).

Standard output is empty