Definition compact_sum_map {X: Type} {F F0: X -> Type} (l: list X)
  (f: ListType (map (fun x => F x -> F0 x) l)): compact_sum (map F l) -> compact_sum (map F0 l).

Lemma compact_sum_map_cons_inl: forall {X: Type} {F F0: X -> Type} (x x0: X) (l: list X) (f: F x -> F0 x) (fl: ListType (map (fun x => F x -> F0 x) (x0 :: l))) (v: F x), compact_sum_map (x :: x0 :: l) (Cons f fl) (inl v) = inl (f v).