Definition reptype_structlist (m: members) := compact_prod (map (fun it => reptype (field_type (fst it) m)) m).Definition reptype_unionlist (m: members) := compact_sum (map (fun it => reptype (field_type (fst it) m)) m).Global Notation REPTYPE t :=
  match t return Type with
  | Tvoid
  | Tfunction _ _ _ => unit
  | Tint _ _ _
  | Tlong _ _
  | Tfloat _ _
  | Tpointer _ _ => val
  | Tarray t0 _ _ => list (reptype t0)
  | Tstruct id _ => reptype_structlist (co_members (get_co id))
  | Tunion id _ => reptype_unionlist (co_members (get_co id))
  end.

Lemma reptype_eq: forall t, reptype t = REPTYPE t.