∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.Abelian C] {X Y : C} (f f_1 : X ⟶ Y)
  (e_f : f = f_1) [inst_2 : CategoryTheory.Mono f] {T : C} (g g_1 : T ⟶ Y) (e_g : g = g_1)
  (hg : CategoryTheory.CategoryStruct.comp g (CategoryTheory.Limits.cokernel.π f) = 0),
  CategoryTheory.Abelian.monoLift f g hg = CategoryTheory.Abelian.monoLift f_1 g_1 ⋯