{"ast_node_type":"variable","tokens":[{"end":80,"kind":"keyword","start":0,"text":"}"}]}
            } else if let Some((feature, level)) = parse_unstability(cx, args) {
                    .emit_err(session_diagnostics::MultipleStabilityLevels { span: cx.attr_span });
                this.stability = Some((DefaultBodyStability { level, feature }, cx.attr_span));