∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.Limits.HasZeroObject C]
  [inst_2 : CategoryTheory.HasShift C ℤ] [inst_3 : CategoryTheory.Preadditive C]
  [inst_4 : ∀ (n : ℤ), (CategoryTheory.shiftFunctor C n).Additive] [hC : CategoryTheory.Pretriangulated C]
  {T T' : CategoryTheory.Pretriangulated.Triangle C} (φ : T ⟶ T'),
  T ∈ CategoryTheory.Pretriangulated.distinguishedTriangles →
    T' ∈ CategoryTheory.Pretriangulated.distinguishedTriangles →
      CategoryTheory.IsIso φ.hom₁ → CategoryTheory.IsIso φ.hom₂ → CategoryTheory.IsIso φ.hom₃