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