File: t6815.scala

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scala 2.11.12-6
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trait U {
  trait ValOrDefDefApi {
    def name: Any
  }
  type ValOrDefDef <: ValOrDefDefApi
  type ValDef <: ValOrDefDef with ValDefApi
  trait ValDefApi extends ValOrDefDefApi { this: ValDef => }
  val emptyValDef: ValDef // the result type is volatile
}

object Test {
  val u: U = ???

  u.emptyValDef match {
    case u.emptyValDef => // but we shouldn't let that stop us from treating it as a stable identifier pattern.
  }
}