--- a/mercurial/error.py	Mon Jan 12 11:09:14 2009 -0600
+++ b/mercurial/error.py	Mon Jan 12 11:28:28 2009 -0600
@@ -46,3 +46,7 @@
 
 class LockUnavailable(LockError):
     pass
+
+class ResponseError(Exception):
+    """Raised to print an error with part of output and exit."""
+