∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.Limits.HasZeroMorphisms C] {X Y : C}
  {f : X ⟶ Y} {X' Y' : C} {f' : X' ⟶ Y'} {cc : CategoryTheory.Limits.CokernelCofork f}
  (hf : CategoryTheory.Limits.IsColimit cc) (cc' : CategoryTheory.Limits.CokernelCofork f')
  (φ : CategoryTheory.Arrow.mk f ⟶ CategoryTheory.Arrow.mk f'),
  CategoryTheory.CategoryStruct.comp (CategoryTheory.Limits.Cofork.π cc)
      (CategoryTheory.Limits.CokernelCofork.mapOfIsColimit hf cc' φ) =
    CategoryTheory.CategoryStruct.comp φ.right (CategoryTheory.Limits.Cofork.π cc')