{C : Type u} →
  [inst : CategoryTheory.Category.{v, u} C] →
    [inst_1 : CategoryTheory.Limits.HasZeroObject C] →
      [inst_2 : CategoryTheory.Limits.HasZeroMorphisms C] →
        {Z : C} → (self : CategoryTheory.InjectiveResolution Z) → (CochainComplex.single₀ C).obj Z ⟶ self.cocomplex