(** Decidability of the [is_reachable_from_env] predicate. *)

(* Specifications: *)
Lemma is_reachable_from_env_dec:
forall f e sp ofs, is_reachable_from_env f e sp ofs \/ ~is_reachable_from_env f e sp ofs.
Lemma is_reachable_from_env_dec:
forall f e sp ofs, is_reachable_from_env f e sp ofs \/ ~is_reachable_from_env f e sp ofs.