{"ast_node_type":"variable","tokens":[{"end":42,"kind":"keyword","start":0,"text":"let"}]}
        let kind = self.def_kind(item_id);
    fn get_adt_def<'tcx>(self, item_id: DefIndex, tcx: TyCtxt<'tcx>) -> ty::AdtDef<'tcx> {
        let did = self.local_def_id(item_id);