t5224.scala:3: warning: Implementation restriction: subclassing Classfile does not
make your annotation visible at runtime.  If that is what
you want, you must write the annotation class in Java.
class Foo(bar: String) extends annotation.ClassfileAnnotation
      ^
{
  @new Foo(bar = "qwe") class C extends AnyRef {
    def <init>() = {
      super.<init>();
      ()
    }
  };
  ()
}