{C : Type u} →
  [inst : CategoryTheory.Category.{v, u} C] →
    [inst_1 : CategoryTheory.Preadditive C] →
      (R : Type u_1) →
        [inst_2 : Ring R] →
          [inst_3 : CategoryTheory.Linear R C] →
            (F G : CochainComplex C ℤ) →
              (n m : ℤ) → CochainComplex.HomComplex.Cochain F G n →ₗ[R] CochainComplex.HomComplex.Cochain F G m