object Match4
  def sideEffect(): Int(32) = {
    Std.printString("This side effect should only happen once!");
    10
  }

  sideEffect() match {
    case 1  => Std.printString("no"); false
    case 2  => Std.printString("no"); false
    case 10 => Std.printString("yes"); true
  }
end Match4