{"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"let"}]}
            let def_id = LocalDefId { local_def_index };
        let parent_id = parent_id.map_or(CRATE_OWNER_ID, |local_def_index| {
            self.tcx.local_def_id_to_hir_id(def_id).owner