(** Compatibility between a compilation environment and an address-taken set. *)

Definition compat_cenv (atk: VSet.t) (cenv: compilenv) : Prop :=
  forall id, VSet.In id atk -> VSet.In id cenv -> False.

Lemma sizeof_by_value: forall ty chunk, access_mode ty = By_value chunk -> size_chunk chunk <= sizeof ge ty.