∀ {C : Type u_2} {D : Type u_4} [inst : CategoryTheory.Category.{u_5, u_2} C]
  [inst_1 : CategoryTheory.Category.{u_3, u_4} D] {A : Type u_1} [inst_2 : AddMonoid A]
  [inst_3 : CategoryTheory.HasShift D A] (F : CategoryTheory.SingleFunctors C D A) (n a a' : A) (ha' : n + a = a'),
  CategoryTheory.CategoryStruct.comp (F.shiftIso n a a' ha').hom (CategoryTheory.CategoryStruct.id (F.functor a)) =
    CategoryTheory.CategoryStruct.comp
      (CategoryTheory.Functor.whiskerRight (CategoryTheory.CategoryStruct.id (F.functor a'))
        (CategoryTheory.shiftFunctor D n))
      (F.shiftIso n a a' ha').hom