Definition check_gvars_spec (GV: option globals) (GV': option globals) : Prop :=
  match GV' with Some _ => GV = GV' | _ => True end.Definition strong_cast (t1 t2: type) (v: val) : val :=
 force_val (sem_cast t1 t2 v).

Lemma isolate_LOCAL_lem1: forall Q, PROPx nil (LOCALx Q (SEPx (TT::nil))) = local (fold_right `(and) `(True) (map locald_denote Q)).