def enhance(self, domain, enhancement, options=None):
        try:
            func = self._enhance_func[enhancement]
        except KeyError:
            raise errors.PluginError(
                "Unsupported enhancement: {0}".format(enhancement))
        try:
            func(self.choose_vhost(domain), options)
        except errors.PluginError:
            logger.warn("Failed %s for %s", enhancement, domain)
            raise
vardecls : vardecls COMMA vardecl
dataset/ETHPy150Open letsencrypt/letsencrypt/certbot-apache/certbot_apache/configurator.py/ApacheConfigurator.enhance--crossover with--dataset/ETHPy150Open Microsoft/ivy/src/ivy/ivy_dafny_grammar.py/p_vardecls_vardecls_comma_vardecl