File: t397.scala

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scala 2.11.12-6
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abstract class Root {

  abstract class Edge {
    type V;
    def source: V;
  }

  abstract class Graph {
    type W;
    type E <: Edge{type V = W};
    def edge: E;
  }

  val g: Graph{type W = Int};
  val x: Int = g.edge.source;
}