∀ (C : Type u) {A : Type u_1} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : AddMonoid A]
  [inst_2 : CategoryTheory.HasShift C A] (i j k : A) (h : i + j = k),
  CategoryTheory.shiftFunctorAdd' C i j k h = CategoryTheory.eqToIso ⋯ ≪≫ CategoryTheory.shiftFunctorAdd C i j