}

        Optional<CtClass> oldClass = member.oldClass
        Optional<CtClass> newClass = member.newClass
        if (!oldClass.isPresent() || !newClass.isPresent()) {
            // breaking change would be reported
            return null
        }

        return checkSuperClassChanges(member, oldClass.get(), newClass.get())
    }

    protected abstract boolean changed(JApiCompatibility member)

    }

    protected Violation checkSuperClassChanges(JApiClass c, CtClass oldClass, CtClass newClass) {
        Map<String, CtClass> oldInterfaces = collectImplementedInterfaces(oldClass)
        Map<String, CtClass> newInterfaces = collectImplementedInterfaces(newClass)

        newInterfaces.keySet().removeAll(oldInterfaces.keySet())

        if (newInterfaces.isEmpty()) {
            return null

        }
        [OldBase, OldSub, NewBase, NewSub].each {
            classes[it.simpleName] = instanceScopedPool.get(it.name)
        }

        classes['OldBase'].superclass = classes['OldSuperInternal']
        classes['NewBase'].superclass = classes['NewSuperInternal']
        classes['OldSub'].superclass = classes['OldBase']
        classes['NewSub'].superclass = classes['NewBase']

    static class NewSuper {}

    static class NewBase extends NewSuper {}

    @Incubating
    static class NewIncubatingBase extends NewSuper {}

    @Incubating
    interface IncubatingInterface {}

    interface InternalInterface {}

    interface StablePublicInterface {}

    CtClass oldBase
    CtClass newBase
    CtClass newSuper
    CtClass newIncubatingBase

    }

    protected Violation checkSuperClassChanges(JApiClass c, CtClass oldClass, CtClass newClass) {
        Set<CtMethod> oldMethods = collectAllPublicApiMethods(oldClass.superclass)
        Set<CtMethod> newMethods = collectAllPublicApiMethods(newClass.superclass)

        oldMethods.removeAll(newMethods)

        if (oldMethods.isEmpty()) {
            return null
        }

    }

    @Override
    protected Violation checkSuperClassChanges(JApiClass apiClass, CtClass oldClass, CtClass newClass) {
        return acceptOrReject(apiClass.superclass, Violation.notBinaryCompatible(apiClass.superclass))
    }