case class Foo(private val x: Int, y: Option[Int], z: Boolean)

object Test extends dotty.runtime.LegacyApp {
  def foo(x: Foo) = x match {
    case Foo(x, Some(y), z) => y
    case Foo(x, y, z) => 0
  }
  val x = Foo(1, Some(2), false)
  println(foo(x))


  def bar(x: Foo) = x match {
	  case Foo(x, Some(y), z) => y
	  case Foo(x, None, z) => 0
	}
  println(bar(x))
}