File: t6537.scala

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scala 2.11.12-6
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package tester

object PatMatWarning {

  sealed trait X
  sealed trait Y

  def f(x: X) = x match {
    case _: Y => false
    case _    => true
  }

  class X1 extends X
  class Y1 extends Y
  class Z1 extends X with Y
}