bzr-grep: FTBFS: __init__() takes at least 5 arguments (4 given)

Imported from Debian bug http://bugs.debian.org/652757:

Source: bzr-grep
Version: 0.4.0-4
Severity: serious
Tags: wheezy sid
User: <email address hidden>
Usertags: qa-ftbfs-20111220 qa-ftbfs
Justification: FTBFS on amd64

Hi,

During a rebuild of all packages in sid, your package failed to build on
amd64.

Relevant part:
> make[1]: Entering directory `/build/bzr-grep-6P4N4z/bzr-grep-0.4.0'
> BZR_PLUGINS_AT=grep@/build/bzr-grep-6P4N4z/bzr-grep-0.4.0 /usr/bin/bzr selftest -s bp.grep
> bzr: ERROR: exceptions.TypeError: Error when calling the metaclass bases
> __init__() takes at least 5 arguments (4 given)
>
> Traceback (most recent call last):
> File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 923, in exception_to_return_code
> return the_callable(*args, **kwargs)
> File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1128, in run_bzr
> ret = run(*run_argv)
> File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 676, in run_argv_aliases
> return self.run(**all_cmd_args)
> File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 698, in run
> return self._operation.run_simple(*args, **kwargs)
> File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 135, in run_simple
> self.cleanups, self.func, *args, **kwargs)
> File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 165, in _do_with_cleanups
> result = func(*args, **kwargs)
> File "/usr/lib/python2.7/dist-packages/bzrlib/builtins.py", line 4012, in run
> result = tests.selftest(**selftest_kwargs)
> File "/usr/lib/python2.7/dist-packages/bzrlib/tests/__init__.py", line 3708, in selftest
> suite = test_suite(keep_only, starting_with)
> File "/usr/lib/python2.7/dist-packages/bzrlib/tests/__init__.py", line 4198, in test_suite
> plugin_suite = plugin.test_suite()
> File "/usr/lib/python2.7/dist-packages/bzrlib/plugin.py", line 554, in test_suite
> return self.module.test_suite()
> File "/build/bzr-grep-6P4N4z/bzr-grep-0.4.0/__init__.py", line 259, in test_suite
> ["%s.%s" % (__name__, tmn) for tmn in testmod_names]))
> File "/usr/lib/python2.7/dist-packages/bzrlib/tests/TestUtil.py", line 148, in loadTestsFromModuleNames
> result.addTests(self.loadTestsFromModuleName(name))
> File "/usr/lib/python2.7/dist-packages/bzrlib/tests/TestUtil.py", line 153, in loadTestsFromModuleName
> module = pyutils.get_named_object(name)
> File "/usr/lib/python2.7/dist-packages/bzrlib/pyutils.py", line 57, in get_named_object
> __import__(module_name, globals(), locals(), [])
> File "/build/bzr-grep-6P4N4z/bzr-grep-0.4.0/test_grep.py", line 21, in <module>
> import features
> File "/build/bzr-grep-6P4N4z/bzr-grep-0.4.0/features.py", line 21, in <module>
> class _ColorFeature(tests.Feature):
> TypeError: Error when calling the metaclass bases
> __init__() takes at least 5 arguments (4 given)
>
> bzr 2.5b4 on python 2.7.2 (Linux-2.6.32-5-amd64-x86_64-with-debian-wheezy-sid)
> arguments: ['/usr/bin/bzr', 'selftest', '-s', 'bp.grep']
> plugins: bash_completion[2.5b4], changelog_merge[2.5b4], grep[0.4.0],
> launchpad[2.5b4], netrc_credential_store[2.5b4], news_merge[2.5b4],
> po_merge[2.5b4], weave_fmt[2.5b4]
> encoding: 'ANSI_X3.4-1968', fsenc: 'ANSI_X3.4-1968', lang: None
>
> *** Bazaar has encountered an internal error. This probably indicates a
> bug in Bazaar. You can help us fix it by filing a bug report at
> https://bugs.launchpad.net/bzr/+filebug
> including this traceback and a description of the problem.
> make[1]: *** [override_dh_auto_test] Error 4

The full build log is available from:
   http://people.debian.org/~lucas/logs/2011/12/20/bzr-grep_0.4.0-4_lsid64.buildlog

A list of current common problems and possible solutions is available at
http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to contribute!

About the archive rebuild: The rebuild was done on about 50 AMD64 nodes
of the Grid'5000 platform, using a clean chroot. Internet was not
accessible from the build systems.