{"ast_node_type":"impl","tokens":[{"end":77,"kind":"keyword","start":0,"text":")"}]}
    ) -> impl ExactSizeIterator<Item = (Self::Ty, PrivateUninhabitedField)> {
        ty: &Self::Ty,
        let single = |ty| smallvec![(ty, PrivateUninhabitedField(false))];