(C : Type u_1) →
  (D : Type u_2) →
    [inst : CategoryTheory.Category.{v_1, u_1} C] →
      [inst_1 : CategoryTheory.Category.{v_2, u_2} D] →
        [inst_2 : CategoryTheory.MonoidalCategory C] →
          [inst_3 : CategoryTheory.MonoidalCategory.MonoidalLeftAction C D] →
            CategoryTheory.MonoidalCategory.MonoidalLeftAction.actionLeft D
                (CategoryTheory.MonoidalCategoryStruct.tensorUnit C) ≅
              CategoryTheory.Functor.id D