File: t5158.scala

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scala 2.11.12-5
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case class B(var x: Int) {
  def succ() {
    x = x + 1
  }
}

object Test {
  def main(args: Array[String]) {
    val b = B(0)
    b match {
      case B(x) =>
        //println(x)
        b.succ()
        println(x)
    }
  }
}