The simple document::

   .. math:: 2 + 2 = 5

produces the error



version:

rst2s5.py (Docutils 0.11 [release], Python 2.7.4, on linux2)



traceback:

Traceback (most recent call last):
  File "/usr/local/bin/rst2s5.py", line 24, in <module>
    publish_cmdline(writer_name='s5', description=description)
  File "/usr/local/lib/python2.7/dist-packages/docutils/core.py", line 352, in publish_cmdline
    config_section=config_section, enable_exit_status=enable_exit_status)
  File "/usr/local/lib/python2.7/dist-packages/docutils/core.py", line 219, in publish
    output = self.writer.write(self.document, self.destination)
  File "/usr/local/lib/python2.7/dist-packages/docutils/writers/__init__.py", line 80, in write
    self.translate()
  File "/usr/local/lib/python2.7/dist-packages/docutils/writers/html4css1/__init__.py", line 179, in translate
    self.output = self.apply_template()
  File "/usr/local/lib/python2.7/dist-packages/docutils/writers/html4css1/__init__.py", line 185, in apply_template
    subs = self.interpolation_dict()
  File "/usr/local/lib/python2.7/dist-packages/docutils/writers/html4css1/__init__.py", line 192, in interpolation_dict
    subs[attr] = ''.join(getattr(self, attr)).rstrip('\n')
TypeError: sequence item 4: expected string or Unicode, list found