File: t577.scala

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scala 2.11.12-6
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trait PriorityTree {
  type Node <: BasicTreeNode;

  val top = initTree;
  top.next = (initTree);
  top.next.prev = (top);

  def initTree : Node;




  trait BasicTreeNode {
    private[PriorityTree] var next  : Node = _;
    private[PriorityTree] var prev  : Node = _;
    private[PriorityTree] var chld : Node = _;
    //var next  : Node = _;
    //var prev  : Node = _;
    //var chld : Node = _;
  }
}