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Interesting. I was running tests directly most of the times
and also in verbose mode, which indeed was hiding the
problem that would happen when stdout is replaced.

Now, one thing I wonder is about this:

http://www.python.org/dev/buildbot/all/g4%20osx.4%20trunk/builds/1424/step-test/0

Why is it failing?  In the first run, when all buildbots
were broken, this is what was happening.  It does look like
tests are succeeding, and the implementation is the same as
the currently committed one, but buildbot still says it's
broken for some reason, and no error messages. Strange.