{C : Type u_1} →
  [inst : CategoryTheory.Category.{v_1, u_1} C] →
    [inst_1 : CategoryTheory.Abelian C] →
      CochainComplex C ℤ → CochainComplex C ℤ → [CategoryTheory.EnoughInjectives C] → ℤ → CochainComplex C ℤ