--- a/mercurial/error.py	Sun Jan 11 23:00:09 2009 -0600
+++ b/mercurial/error.py	Sun Jan 11 23:04:24 2009 -0600
@@ -24,3 +24,6 @@
 
     def __str__(self):
         return RevlogError.__str__(self)
+
+class ParseError(Exception):
+    """Exception raised on errors in parsing the command line."""