{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"(ty::Contravariant,"}]}
        (ty::Contravariant, ty::Covariant) | (ty::Covariant, ty::Contravariant) => ty::Invariant,
        // If type is required to be covariant and contravariant, then it's invariant.
        // Otherwise, co + co = co, contra + contra = contra.