{"ast_node_type":"other","tokens":[{"end":31,"kind":"keyword","start":0,"text":"type"}]}
    type Item = (Symbol, Span);
    const PATH: &'static [rustc_span::Symbol] = &[sym::unstable_feature_bound];
    const CONVERT: ConvertFn<Self::Item> = |items, _| AttributeKind::UnstableFeatureBound(items);