{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"impl<'tcx>"}]}
impl<'tcx> HashStable<StableHashingContext<'tcx>> for rustc_feature::Features {
    fn hash_stable(&self, hcx: &mut StableHashingContext<'tcx>, hasher: &mut StableHasher) {