{"ast_node_type":"variable","tokens":[{"end":90,"kind":"keyword","start":0,"text":"let"}]}
        let rustc_feature::EnabledLangFeature { gate_name, attr_sp, stable_since } = self;
    fn hash_stable(&self, hcx: &mut StableHashingContext<'tcx>, hasher: &mut StableHasher) {
        gate_name.hash_stable(hcx, hasher);