∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.MonoidalCategory C] {X Y : C}
  (f g : X ⟶ Y),
  CategoryTheory.MonoidalCategoryStruct.tensorHom f
        (CategoryTheory.CategoryStruct.id (CategoryTheory.MonoidalCategoryStruct.tensorUnit C)) =
      CategoryTheory.MonoidalCategoryStruct.tensorHom g
        (CategoryTheory.CategoryStruct.id (CategoryTheory.MonoidalCategoryStruct.tensorUnit C)) ↔
    f = g