∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.Abelian C] {X Y : C}
  (f : X ⟶ Y),
  CategoryTheory.CategoryStruct.comp f
      (CategoryTheory.Limits.Cofork.π (CategoryTheory.Limits.colimit.cocone (CategoryTheory.Limits.parallelPair f 0))) =
    0