def to_cloudformation(self, **kwargs):
raise NotImplementedError("<STR_LIT>")<EOL>
Returns a list of Resource instances, representing vanilla CloudFormation resources, to which this macro
        expands. The caller should be able to update their template with the expanded resources by calling
        :func:`to_dict` on each resource returned, then updating their "Resources" mapping with the results.

        :param dict kwargs
        :returns: a list of vanilla CloudFormation Resource instances, to which this macro expands