∀ {𝕜 : Type u} [inst : NontriviallyNormedField 𝕜] {x : 𝕜} {s : Set 𝕜} {R : Type u_1} [inst_1 : CommSemiring R]
  [inst_2 : Algebra R 𝕜] (q : Polynomial R), DifferentiableWithinAt 𝕜 (fun x => (Polynomial.aeval x) q) s x