def _check_endpoints(self, seen_endpoints):
        """
        Warn if some of the app's enpoints are not in seen_endpoints.
        """
        get_endpoints = set(
            rule.endpoint for rule in self.app.url_map.iter_rules()
            if 'GET' in rule.methods)
        not_generated_endpoints = seen_endpoints - get_endpoints

        if self.static_files_urls in self.url_generators:
            # Special case: do not warn when there is no static file
            not_generated_endpoints -= set(self._static_rules_endpoints())

        if not_generated_endpoints:
            warnings.warn(
                'Nothing frozen for endpoints %s. Did you forget an URL '
                'generator?' % ', '.join(
                    unicode(e) for e in not_generated_endpoints),
                MissingURLGeneratorWarning,
                stacklevel=3)
dataset/ETHPy150Open SimonSapin/Frozen-Flask/flask_frozen/__init__.py/Freezer._check_endpoints/swapped operands of `-`