--- a/hgext/convert/common.py	Sun Jul 01 12:58:08 2007 -0700
+++ b/hgext/convert/common.py	Sun Jul 01 15:02:15 2007 -0700
@@ -12,7 +12,7 @@
 class converter_source(object):
     """Conversion source interface"""
 
-    def __init__(self, ui, path):
+    def __init__(self, ui, path, rev=None):
         """Initialize conversion source (or raise NoRepo("message")
         exception if path is not a valid repository)"""
         raise NotImplementedError()