Section cuof.
Context (cenv: composite_env).
Fixpoint complete_legal_cosu_type t :=
match t with
| Tarray t' _ _ => complete_legal_cosu_type t'
| Tstruct id _ => match cenv ! id with
| Some co => match co_su co with
| Struct => true
| Union => false
end
| _ => false
end
| Tunion id _ => match cenv ! id with
| Some co => match co_su co with
| Struct => false
| Union => true
end
| _ => false
end
| Tfunction _ _ _
| Tvoid => false
| _ => true
end.
Fixpoint composite_complete_legal_cosu_type (m: members): bool :=
match m with
| nil => true
| (_, t) :: m' => complete_legal_cosu_type t && composite_complete_legal_cosu_type m'
end.
Definition composite_env_complete_legal_cosu_type: Prop :=
forall (id : positive) (co : composite),
cenv ! id = Some co -> composite_complete_legal_cosu_type (co_members co) = true.
End cuof.

Lemma complete_legal_cosu_type_complete_type: forall cenv: composite_env,
forall t,
complete_legal_cosu_type cenv t = true ->
complete_type cenv t = true.