--- a/hgext/obsolete.py	Wed Mar 28 21:13:46 2012 +0200
+++ b/hgext/obsolete.py	Mon Apr 02 14:43:41 2012 +0200
@@ -101,7 +101,7 @@
 try:
     from mercurial.localrepo import storecache
     storecache('babar') # to trigger import
-except TypeError:
+except (TypeError, ImportError):
     def storecache(*args):
         return scmutil.filecache(*args, instore=True)