Definition set_lemma (temp : PTree.t (type * bool)) (var : PTree.t type)
(ret : type) (gt : PTree.t type) (id : ident)
(e : Clight.expr) (ty : type): my_lemma.
reify_lemma reify_vst (semax_set_localD temp var ret gt id e ty).
Defined.

Lemma nth_error_prop:
forall P T1 T2 R Rn (n : nat) S,
assertD P (localD T1 T2) [Rn] |-- !! S ->
nth_error R n = Some Rn ->
assertD P (localD T1 T2) R |-- !! S.