File: t7669.scala

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scala 2.11.12-6
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object Test {

  sealed abstract class Expr
  // Change type of `arg` to `Any` and the exhaustiveness warning
  // is issued below
  case class Op(arg: Expr) extends Expr
  case class NotHandled(num: Double) extends Expr

  def exhausto(expr: Expr): Unit = expr match {
    case Op(Op(_)) =>
    case Op(_) =>
  }
}