{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"const"}]}
    const CONVERT: ConvertFn<Self::Item> = |items, _| AttributeKind::UnstableFeatureBound(items);
    type Item = (Symbol, Span);
    const TEMPLATE: AttributeTemplate = template!(Word, List: "feat1, feat2, ...");