{"ast_node_type":"variable","tokens":[{"end":65,"kind":"keyword","start":0,"text":"let"}]}
            let hir_id = self.tcx.local_def_id_to_hir_id(def_id);
                self.tcx.fn_sig(sig_id).skip_binder().bound_vars().iter().collect();
            self.rbv.late_bound_vars.insert(hir_id.local_id, bound_vars);