∀ {C : Type u_1} {A : Type u_3} [inst : CategoryTheory.Category.{u_2, u_1} C] [inst_1 : AddMonoid A]
  [inst_2 : CategoryTheory.HasShift C A] (a : A) (X : C),
  (CategoryTheory.shiftFunctor C (0 + a)).obj X =
    (CategoryTheory.shiftFunctor C a).obj ((CategoryTheory.Functor.id C).obj X)