{R : Type u_1} →
  [inst : Semiring R] →
    {C : Type u_2} →
      {D : Type u_3} →
        [inst_1 : CategoryTheory.Category.{v_1, u_2} C] →
          [inst_2 : CategoryTheory.Category.{v_2, u_3} D] →
            [inst_3 : CategoryTheory.Preadditive D] →
              [CategoryTheory.Linear R D] → CategoryTheory.Linear R (CategoryTheory.Functor C D)