Require Export sha.pure_lemmas.
Require Export sha.general_lemmas.
Require Export sha.vst_lemmas.
Export ListNotations.
Local Open Scope logic.
Global Opaque K256.
Transparent peq.
Fixpoint loops (s: statement) : list statement :=
match s with
| Ssequence a b => loops a ++ loops b
| Sloop _ _ => [s]
| Sifthenelse _ a b => loops a ++ loops b
| _ => nil
end.
Fixpoint sequence (cs: list statement) s :=
match cs with
| nil => s
| c::cs' => Ssequence c (sequence cs' s)
end.
Fixpoint rsequence (cs: list statement) s :=
match cs with
| nil => s
| c::cs' => Ssequence (rsequence cs' s) c
end.

Lemma seq_assocN:
forall {Espec: OracleKind} CS,
forall Q Delta P cs s R,
@semax CS Espec Delta P (sequence cs Sskip) (normal_ret_assert Q) ->
@semax CS Espec
Delta  Q s R ->
@semax CS Espec Delta P (sequence cs s) R.