diff -r 4417eb761ba8 -r 329887a7074c mercurial/context.py
--- a/mercurial/context.py	Fri Apr 06 15:16:30 2012 -0500
+++ b/mercurial/context.py	Fri Apr 06 15:18:14 2012 -0500
@@ -127,7 +127,7 @@
     def phasestr(self):
         return phases.phasenames[self.phase()]
     def mutable(self):
-        return self._repo._phaserev[self._rev] > phases.public
+        return self.phase() > phases.public
     def hidden(self):
         return self._rev in self._repo.changelog.hiddenrevs