∀ {𝕜 : Type u_1} [inst : NontriviallyNormedField 𝕜] {E : Type u_2} [inst_1 : SeminormedAddCommGroup E]
  [inst_2 : NormedSpace 𝕜 E] {F : Type u_3} [inst_3 : SeminormedAddCommGroup F] [inst_4 : NormedSpace 𝕜 F]
  {G : Type u_4} [inst_5 : SeminormedAddCommGroup G] [inst_6 : NormedSpace 𝕜 G] {X : Type u_5}
  [inst_7 : TopologicalSpace X] {g : X → F →L[𝕜] G} {f : X → E →L[𝕜] F} {s : Set X} {x : X},
  ContinuousWithinAt g s x → ContinuousWithinAt f s x → ContinuousWithinAt (fun x => (g x).comp (f x)) s x