t6083.scala:6: 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 annot(value: String) extends annotation.ClassfileAnnotation ^ t6083.scala:7: error: annotation argument needs to be a constant; found: conv.i2s(101) @annot(101) class C ^ one warning found one error found