{"ast_node_type":"variable","tokens":[{"end":64,"kind":"keyword","start":0,"text":"let"}]}
            let nrules = self.r.local_macro_map[&def_id].nrules;
            self.r.unused_macros.insert(def_id, (node_id, ident));
            self.r.unused_macro_rules.insert(node_id, DenseBitSet::new_filled(nrules));