anyval-anyref-parent.scala:2: error: only classes (not traits) are allowed to extend AnyVal
trait Foo2 extends AnyVal // fail
      ^
anyval-anyref-parent.scala:5: error: Any does not have a constructor
class Bar1 extends Any      // fail
                   ^
anyval-anyref-parent.scala:6: error: value class parameter must be a val and not be private[this]
class Bar2(x: Int) extends AnyVal // fail
           ^
anyval-anyref-parent.scala:10: error: illegal inheritance; superclass Any
 is not a subclass of the superclass Object
 of the mixin trait Immutable
trait Foo4 extends Any with Immutable // fail
                            ^
anyval-anyref-parent.scala:11: error: illegal inheritance; superclass AnyVal
 is not a subclass of the superclass Object
 of the mixin trait Immutable
trait Foo5 extends AnyVal with Immutable   // fail
                               ^
anyval-anyref-parent.scala:11: error: only classes (not traits) are allowed to extend AnyVal
trait Foo5 extends AnyVal with Immutable   // fail
      ^
6 errors found