{C : Type u₁} →
  [inst : CategoryTheory.Category.{v₁, u₁} C] →
    {D : Type u₂} →
      [inst_1 : CategoryTheory.Category.{v₂, u₂} D] →
        {E : Type u₃} →
          [inst_2 : CategoryTheory.Category.{v₃, u₃} E] →
            {G G' : CategoryTheory.Functor C (CategoryTheory.Functor D E)} →
              (G ⟶ G') → (Y : D) → G.flip.obj Y ⟶ G'.flip.obj Y