diff -r d8143769e1d4 -r d1b135f2f415 hgext/convert/common.py
--- a/hgext/convert/common.py	Sat Sep 05 18:56:51 2009 +0200
+++ b/hgext/convert/common.py	Sun Sep 06 15:29:14 2009 +0200
@@ -203,6 +203,8 @@
         """Put tags into sink.
 
         tags: {tagname: sink_rev_id, ...} where tagname is an UTF-8 string.
+        Return a pair (tag_revision, tag_parent_revision), or (None, None)
+        if nothing was changed.
         """
         raise NotImplementedError()