{A : Type u₁} →
  [inst : CategoryTheory.Category.{v₁, u₁} A] →
    {B : Type u₂} →
      [inst_1 : CategoryTheory.Category.{v₂, u₂} B] →
        {T : Type u₃} →
          [inst_2 : CategoryTheory.Category.{v₃, u₃} T] →
            (L : CategoryTheory.Functor A T) →
              {R₁ R₂ R₃ : CategoryTheory.Functor B T} →
                (r : R₁ ⟶ R₂) →
                  (r' : R₂ ⟶ R₃) →
                    CategoryTheory.Comma.mapRight L (CategoryTheory.CategoryStruct.comp r r') ≅
                      (CategoryTheory.Comma.mapRight L r).comp (CategoryTheory.Comma.mapRight L r')