diff -r fdcdb221a922 -r 7e295dd10d40 mercurial/changelog.py
--- a/mercurial/changelog.py	Thu Jun 16 13:24:44 2011 -0500
+++ b/mercurial/changelog.py	Thu Jun 16 01:57:53 2011 +0200
@@ -107,6 +107,8 @@
         self._realopener = opener
         self._delayed = False
         self._divert = False
+        # hiddenrevs: revs that should be hidden by command and tools
+        self.hiddenrevs = set()
 
     def delayupdate(self):
         "delay visibility of index updates to other readers"