{"ast_node_type":"variable","tokens":[{"end":80,"kind":"keyword","start":0,"text":"let"}]}
        let fn_parse_mode = FnParseMode { req_name: |_| true, req_body: false };
    ) -> PResult<'a, Option<Option<P<ForeignItem>>>> {
        Ok(self.parse_item_(fn_parse_mode, force_collect)?.map(