File: t1236.scala

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scala 2.9.2%2Bdfsg-1
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trait Empty[E[_]] {
  def e[A]: E[A] 
}

object T {
  val ListEmpty = new Empty[List] {
    def e[A] = Nil
  }

  def foo[F[_]](q:(String,String)) = "hello"
  def foo[F[_]](e: Empty[F]) = "world"

  val x = foo[List](ListEmpty)
}