{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"FnHeader"}]}
                            FnHeader { ext: Extern::from_abi(*abi, *extern_span), ..sig.header };
                        let new_header =
                        self.collect_fn_info(new_header, &sig.decl, foreign_item.id, &item.attrs);