--- a/mercurial/error.py	Thu Aug 27 00:00:15 2009 +0200
+++ b/mercurial/error.py	Mon Aug 31 10:58:33 2009 -0500
@@ -36,6 +36,9 @@
 class RepoError(Exception):
     pass
 
+class RepoLookupError(RepoError):
+    pass
+
 class CapabilityError(RepoError):
     pass