Sort u_1 →
  {C : Type u} →
    [inst : CategoryTheory.Category.{v, u} C] →
      {I J : C} →
        {f : I ⟶ J} →
          [inst_1 : CategoryTheory.ChosenPullbacksAlong f] →
            CategoryTheory.ExponentiableMorphism f →
              {C' : Type u} →
                [inst' : CategoryTheory.Category.{v, u} C'] →
                  {I' J' : C'} →
                    {f' : I' ⟶ J'} →
                      [inst'_1 : CategoryTheory.ChosenPullbacksAlong f'] →
                        CategoryTheory.ExponentiableMorphism f' → Sort u_1