From mathcomp.ssreflect Require Import ssreflect seq ssrbool
ssrnat ssrfun eqtype seq fintype finfun.
Set Implicit Arguments.
Require Export compcert.lib.Maps.
From VST.veric Require Import shares juicy_mem juicy_mem_lemmas.
(*IM using proof irrelevance!*)

Lemma perm_order_antisym :
forall p p'
(Hlt: Mem.perm_order'' p p')
(Hgt: Mem.perm_order'' p' p),
p = p'.