(* OLD VERSION: Lemma semax_post': forall R' Espec {cs: compspecs} Delta R P c, R' |-- R -> @semax cs Espec Delta P c (normal_ret_assert R') -> @semax cs Espec Delta P c (normal_ret_assert R). *)

Lemma sequential:
forall Espec {cs: compspecs} Delta P c Q,
@semax cs Espec Delta P c (normal_ret_assert (RA_normal Q)) ->
@semax cs Espec Delta P c Q.