t7171b.scala:2: error: The outer reference in this type test cannot be checked at run time.
  final case class A()
                   ^
t7171b.scala:8: error: The outer reference in this type test cannot be checked at run time.
    case _: A => true; case _ => false
          ^
t7171b.scala:13: error: The outer reference in this type test cannot be checked at run time.
    case _: A => true; case _ => false
          ^
three errors found