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class A
trait B[T <: B[T]] extends A
class C extends B[C] { override def toString = "C" }
class D extends B[D] { override def toString = "D" }
class E {
val ys = List(List(new C), Stream(new D))
}
object Test {
def trav = List(List(), Stream())
def main(args: Array[String]): Unit = {
val f = (new E).ys _
var xs: Set[List[_ <: Seq[B[_]]]] = Set()
xs += f()
println(xs)
}
}
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