∀ {C : Type u₁} {inst : CategoryTheory.Category.{v₁, u₁} C} {inst_1 : CategoryTheory.MonoidalCategory C} {D : Type u₂}
  {inst_2 : CategoryTheory.Category.{v₂, u₂} D} {inst_3 : CategoryTheory.MonoidalCategory D}
  (F : CategoryTheory.Functor C D) [self : F.LaxMonoidal] (X : C) {Z : D} (h : F.obj X ⟶ Z),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategoryStruct.rightUnitor (F.obj X)).hom h =
    CategoryTheory.CategoryStruct.comp
      (CategoryTheory.MonoidalCategoryStruct.whiskerLeft (F.obj X) (CategoryTheory.Functor.LaxMonoidal.ε F))
      (CategoryTheory.CategoryStruct.comp
        (CategoryTheory.Functor.LaxMonoidal.μ F X (CategoryTheory.MonoidalCategoryStruct.tensorUnit C))
        (CategoryTheory.CategoryStruct.comp (F.map (CategoryTheory.MonoidalCategoryStruct.rightUnitor X).hom) h))