(** Corollaries of [external_call_determ]. *)

Lemma external_call_deterministic:
forall ef ge vargs m t vres1 m1 vres2 m2,
external_call ef ge vargs m t vres1 m1 ->
external_call ef ge vargs m t vres2 m2 ->
vres1 = vres2 /\ m1 = m2.