mercurial/util.py

--- a/mercurial/util.py	Sat Sep 07 16:08:11 2013 -0500
+++ b/mercurial/util.py	Fri Sep 06 13:16:21 2013 -0700
@@ -242,6 +242,10 @@
     def __contains__(self, key):
         return key in self._cache
 
+    def clear(self):
+        self._cache.clear()
+        self._order = deque()
+
 def lrucachefunc(func):
     '''cache most recent results of function calls'''
     cache = {}