{"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"iter::once(trace_attr).chain(expanded_attrs).collect()"}]}
            iter::once(trace_attr).chain(expanded_attrs).collect()
                .flat_map(|item| self.process_cfg_attr(&self.expand_cfg_attr_item(cfg_attr, item)));
        } else {