∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.MonoidalCategory C]
  [inst_2 : CategoryTheory.BraidedCategory C] {X Y : CategoryTheory.AddMon C} (f : X ⟶ Y),
  CategoryTheory.CategoryStruct.comp
      (CategoryTheory.MonoidalCategoryStruct.whiskerLeft
        (CategoryTheory.MonoidalCategoryStruct.tensorUnit (CategoryTheory.AddMon C)) f)
      (CategoryTheory.MonoidalCategoryStruct.leftUnitor Y).hom =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.MonoidalCategoryStruct.leftUnitor X).hom f