File: variances_pos.scala

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scala 2.11.12-6
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abstract class P[+a, +b] { // SLS, Example 4.4.2
  def fst: a;
  def snd: b
}

trait Vector[+a] { // SLS, Example 4.4.3 b)
  def append[b >: a](x: Vector[b]): Vector[b]
}