Traceback (most recent call last):
  File "/home/abentley/bzr/nested-trees/bzrlib/tests/blackbox/test_non_ascii.py", line 180, in test_mv
    bzr('mv', 'a', fname1, retcode=3)
  File "/home/abentley/bzr/nested-trees/bzrlib/tests/__init__.py", line 1245, in run_bzr_decode
    return self.run_bzr(*args, **kwargs)[0].decode(encoding)
  File "/home/abentley/bzr/nested-trees/bzrlib/tests/__init__.py", line 1238, in run_bzr
    stdin=stdin, working_dir=working_dir)
  File "/home/abentley/bzr/nested-trees/bzrlib/tests/__init__.py", line 1200, in run_bzr_captured
    argv)
  File "/home/abentley/bzr/nested-trees/bzrlib/tests/__init__.py", line 1463, in apply_redirected
    return a_callable(*args, **kwargs)
  File "/home/abentley/bzr/nested-trees/bzrlib/commands.py", line 644, in run_bzr_catch_errors
    trace.report_exception(sys.exc_info(), sys.stderr)
  File "/home/abentley/bzr/nested-trees/bzrlib/trace.py", line 286, in report_exception
    report_user_error(exc_info, err_file)
  File "/home/abentley/bzr/nested-trees/bzrlib/trace.py", line 304, in report_user_error
    print >>err_file, "bzr: ERROR:", str(exc_info[1])
  File "/home/abentley/bzr/nested-trees/bzrlib/errors.py", line 94, in __str__
    return str(s)
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-3: ordinal not in range(128)