File: t3452f.scala

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scala 2.11.12-6
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import language.higherKinds

trait GenSet[A]

trait GenSetTemplate[A, +CC[X] <: GenSet[X]] {
  def empty: CC[A] = ???
}

trait SetLike[A, +This <: SetLike[A, This] with Set[A]] {
  def empty: This
}

abstract class Set[A] extends GenSet[A] with SetLike[A,Set[A]] with GenSetTemplate[A,Set]

object Test {
  def main(args: Array[String]): Unit = {
    locally(classOf[Set[_]]) // trigger classloading to verify class
  }
}