[issue3158] Doctest fails to find doctests in extension modules

[R. David Murray]

R. David Murray added the comment:

Added some review comments.

Because it could cause possibly buggy doctest fragments to run that previously did not run, I don't think it should be backported as a bug fix.

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nosy: +r.david.murray

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<http://bugs.python.org/issue3158>
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