{"ast_node_type":"variable","tokens":[{"end":49,"kind":"keyword","start":0,"text":"let"}]}
            let span = self.tcx.def_span(def_id);
            let descr = self.tcx.def_descr(def_id.to_def_id());
            self.tcx.dcx().emit_err(errors::MissingStabilityAttr { span, descr });