File: t409.scala

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scala 2.11.12-6
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abstract class Expr;
case class Case1(x: Int) extends Expr;
case class Case2(x: Int) extends Expr;
case class Case3(x: Int) extends Expr;

class Toto extends Expr with Case1(12);

object Main {
  def f(x: Expr): Int = x match {
    case Case1(x) => x
    case Case2(x) => x
    case Case3(x) => x
  }

  def main(args: Array[String]): Unit = {
    Console.println(f(new Toto));
  }
}