On Tue, Jan 11, 2011 at 6:10 PM, Terry J. Reedy <report@bugs.python.org> wrote:
..
> Doctest runs on .rst files, which are plain text files, finds and reports errors, and reports no errors when the errors are fixed.
> See #10875 where is was very helpful. So your last comment puzzles me.
>

Sphinx doctest runner supports doctest fixtures that plain doctest
does not.  Some of the examples in the docs rely on these.

See http://sphinx.pocoo.org/ext/doctest.html .