∀ {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.MonoidalRightAction C D] (w : D) {x y z : C} (f : x ⟶ y) (g : y ⟶ z),
  CategoryTheory.MonoidalCategory.MonoidalRightActionStruct.actionHomRight w (CategoryTheory.CategoryStruct.comp f g) =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategory.MonoidalRightActionStruct.actionHomRight w f)
      (CategoryTheory.MonoidalCategory.MonoidalRightActionStruct.actionHomRight w g)