code: def XXX_REMOVEME(func):
      
      @wraps(func)
      def decorator(self, *args, **kwargs):
          msg = "~~~~~~~ XXX REMOVEME marked method called: {}.{}".format(
              self.__class__.__name__, func.func_name)
          raise RuntimeError(msg)
          return func(self, *args, **kwargs)
      return decorator
docs: Decorator for dead code removal