diff -r 8e503fa54d2d -r 52259d5fb76d mercurial/commands.py
--- a/mercurial/commands.py	Tue Jun 19 08:37:43 2007 -0700
+++ b/mercurial/commands.py	Wed Jun 20 17:53:11 2007 -0700
@@ -1232,8 +1232,7 @@
         heads = repo.heads(start)
     else:
         heads = []
-        visitedset = set()
-        displayer = cmdutil.show_changeset(ui, repo, opts)
+        visitedset = util.set()
         for branchrev in branchrevs:
             branch = repo.changectx(branchrev).branch()
             if branch in visitedset: