{"ast_node_type":"function","tokens":[{"end":92,"kind":"keyword","start":0,"text":"fn"}]}
    fn hash_stable(&self, hcx: &mut StableHashingContext<'tcx>, hasher: &mut StableHasher) {
impl<'tcx> HashStable<StableHashingContext<'tcx>> for rustc_feature::Features {
        // Unfortunately we cannot exhaustively list fields here, since the