File: variances-flip.scala

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scala 2.11.12-6
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trait Foo[-A, +B, -C, +D] {
  private[this] def b: B = ???
  private[this] def d: D = ???

  def f(p1: B => A, p2: D => C) = g(p1(b), p2(d))
  def g(x: A, y: C) = ((b, d))
}