{"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"if"}]}
        if let ast::ItemKind::MacroDef(..) = item.kind {
    fn visit_item(&mut self, item: &'a ast::Item) {
            if self.is_proc_macro_crate && attr::contains_name(&item.attrs, sym::macro_export) {