{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"(Variance::Contravariant,"}]}
            (Variance::Contravariant, Variance::Contravariant) => Variance::Covariant,
            (Variance::Contravariant, Variance::Covariant) => Variance::Contravariant,
            (Variance::Contravariant, Variance::Invariant) => Variance::Invariant,