{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"//"}]}
        // If type is required to be covariant and contravariant, then it's invariant.
        (ty::Invariant, _) | (_, ty::Invariant) => ty::Invariant,
        (ty::Contravariant, ty::Covariant) | (ty::Covariant, ty::Contravariant) => ty::Invariant,