{V : Type u} →
  [inst : CategoryTheory.Category.{v, u} V] →
    [inst_1 : CategoryTheory.Limits.HasZeroMorphisms V] →
      (C : ChainComplex V ℕ) →
        {X : V} →
          (f : C.X 0 ⟶ X) →
            (w : CategoryTheory.CategoryStruct.comp (C.d 1 0) f = 0) → ChainComplex.truncate.obj (C.augment f w) ≅ C