∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] {X Y : C} [inst_1 : CategoryTheory.Limits.HasZeroMorphisms C]
  (f : X ⟶ Y) [inst_2 : CategoryTheory.Limits.HasKernel f] {W : C} (h : W ⟶ X),
  CategoryTheory.CategoryStruct.comp h f = 0 → (CategoryTheory.Limits.kernelSubobject f).Factors h