{"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"Ok(mi)"}]}
            Ok(mi) => return Ok(ast::MetaItemInner::MetaItem(mi)),
        match self.parse_meta_item(AllowLeadingUnsafe::No) {
            Err(err) => err.cancel(), // we provide a better error below