diff -r 21c44c1aed87 -r 2bd51e61c65e mercurial/error.py
--- a/mercurial/error.py	Thu Oct 16 02:05:06 2014 -0700
+++ b/mercurial/error.py	Thu Oct 16 02:06:12 2014 -0700
@@ -65,6 +65,9 @@
 class RepoLookupError(RepoError):
     pass
 
+class FilteredRepoLookupError(RepoLookupError):
+    pass
+
 class CapabilityError(RepoError):
     pass