mercurial/commands.py

--- a/mercurial/commands.py	Sun Mar 13 08:50:06 2011 -0500
+++ b/mercurial/commands.py	Sun Mar 13 15:59:50 2011 +0100
@@ -509,9 +509,9 @@
         if mark is None:
             raise util.Abort(_("new bookmark name required"))
         marks[mark] = marks[rename]
-        del marks[rename]
         if repo._bookmarkcurrent == rename:
             bookmarks.setcurrent(repo, mark)
+        del marks[rename]
         bookmarks.write(repo)
         return