File: t5829.scala

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scala 2.11.12-6
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trait Universe {
  type Tree

  type SymTree <: Tree
  type NameTree <: Tree
  type RefTree <: SymTree with NameTree

  type Ident <: RefTree
  type Select <: RefTree
}

object Test extends App {
  val universe: Universe = null
  import universe._
  def select: Select = ???
  def ident: Ident = ???
  List(select, ident)
}