{"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"SyntaxExtensionKind::Attr(expander)"}]}
                SyntaxExtensionKind::Attr(expander) => {
            InvocationKind::Attr { attr, pos, mut item, derives } => match ext {
                    self.gate_proc_macro_input(&item);