{"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
        let output_macro_rules_scope = self.build_reduced_graph(fragment, parent_scope);
        let parent_scope = ParentScope { expansion, ..self.invocation_parent_scopes[&expansion] };
        self.output_macro_rules_scopes.insert(expansion, output_macro_rules_scope);