import scala.collection.Iterable

class IterableOps[CC[+B] <: Iterable[B], A1, A2](tuple: (CC[A1], Iterable[A2])) {
  def unzip: (CC[A1], CC[A2]) = sys.error("foo")
}

object Test {

  implicit def tupleOfIterableWrapper[CC[+B] <: Iterable[B], A1, A2](tuple: (CC[A1], Iterable[A2]))
      = new IterableOps[CC, A1, A2](tuple)

  val t = (List(1, 2, 3), List(6, 5, 4))

  tupleOfIterableWrapper(t) unzip

  t unzip
}
