{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"impl<S:"}]}
impl<S: Stage> CombineAttributeParser<S> for UnstableFeatureBoundParser {
pub(crate) struct UnstableFeatureBoundParser;
    const PATH: &'static [rustc_span::Symbol] = &[sym::unstable_feature_bound];