∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.SemiCartesianMonoidalCategory C]
  {X Y : C} (f : X ⟶ Y) {Z : C} (h : CategoryTheory.MonoidalCategoryStruct.tensorUnit C ⟶ Z),
  CategoryTheory.CategoryStruct.comp f
      (CategoryTheory.CategoryStruct.comp (CategoryTheory.SemiCartesianMonoidalCategory.toUnit Y) h) =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.SemiCartesianMonoidalCategory.toUnit X) h