From ac37f096ad2b968a36b42f0db40904f4975a80cf Mon Sep 17 00:00:00 2001
From: Mahmoud Hashemi <mahmoud@hatnote.com>
Date: Mon, 30 Mar 2015 20:11:45 -0700
Subject: [PATCH] have cacheutils use the sentinel factory (looks better in the
 docs)

---
 boltons/cacheutils.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/boltons/cacheutils.py b/boltons/cacheutils.py
index a3f9e36..c48314f 100644
--- a/boltons/cacheutils.py
+++ b/boltons/cacheutils.py
@@ -21,9 +21,15 @@ except:
         def __exit__(self, exctype, excinst, exctb):
             pass
 
+try:
+    from compat import make_sentinel
+    _MISSING = make_sentinel(var_name='_MISSING')
+except ImportError:
+    _MISSING = object()
+
+
 PREV, NEXT, KEY, VALUE = range(4)   # names for the link fields
 DEFAULT_MAX_SIZE = 128
-_MISSING = object()
 
 
 class LRU(dict):