(* Lemma unchanged_on_sym P m m' b: Mem.unchanged_on P m m' -> Mem.valid_block m b -> Mem.unchanged_on (fun bb z => P bb z /\ bb=b) m' m. *)

Lemma forall_lessdef_val_listless:
forall args args' (H: Forall2 Val.lessdef args args'),
Val.lessdef_list args args' .