% hg qselect -n
guards deactivated
% hg qguard -l
baz: +bar
foo: unguarded
% hg qpush baz
** unknown exception encountered, details follow
** report bug details to http://www.selenic.com/mercurial/bts
** or mercurial@selenic.com
** Mercurial Distributed SCM (version 0b1b16e842b7)
Traceback (most recent call last):
  File "/home/zilles/njriley/usr/bin/hg", line 20, in ?
    mercurial.dispatch.run()
  File "/home/zilles/njriley/usr/encap/python-2.4.3/lib/python2.4/site-packages/mercurial/dispatch.py", 
line 20, in run
    sys.exit(dispatch(sys.argv[1:]))
  File "/home/zilles/njriley/usr/encap/python-2.4.3/lib/python2.4/site-packages/mercurial/dispatch.py", 
line 29, in dispatch
    return _runcatch(u, args)
  File "/home/zilles/njriley/usr/encap/python-2.4.3/lib/python2.4/site-packages/mercurial/dispatch.py", 
line 45, in _runcatch
    return _dispatch(ui, args)
  File "/home/zilles/njriley/usr/encap/python-2.4.3/lib/python2.4/site-packages/mercurial/dispatch.py", 
line 364, in _dispatch
    ret = _runcommand(ui, options, cmd, d)
  File "/home/zilles/njriley/usr/encap/python-2.4.3/lib/python2.4/site-packages/mercurial/dispatch.py", 
line 417, in _runcommand
    return checkargs()
  File "/home/zilles/njriley/usr/encap/python-2.4.3/lib/python2.4/site-packages/mercurial/dispatch.py", 
line 373, in checkargs
    return cmdfunc()
  File "/home/zilles/njriley/usr/encap/python-2.4.3/lib/python2.4/site-packages/mercurial/dispatch.py", 
line 356, in <lambda>
    d = lambda: func(ui, repo, *args, **cmdoptions)
  File "/home/zilles/njriley/usr/encap/python-2.4.3/lib/python2.4/site-packages/hgext/mq.py", line 
1925, in push
    mergeq=mergeq)
  File "/home/zilles/njriley/usr/encap/python-2.4.3/lib/python2.4/site-packages/hgext/mq.py", line 810, 
in push
    end = self.series.index(patch, start) + 1
ValueError: list.index(x): x not in list