def find_classes_in(res, klass)
      classes = klass.classes_and_modules
      for c in classes
        res << c.full_name
        find_classes_in(res, c)
      end
      res
    end
def find_classes_in(res, klass)
      classes = klass.classes_and_modules
      for c in classes
        res << c.full_name
        find_classes_in(res, c)
      end
      res
    end
----