[issue21178] doctest cause warnings in tests using generators

[Ontje Lünsdorf]

Ontje Lünsdorf added the comment:

Sorry, the test does not really expose the problem with Python 3.4. Here is an updated example.

Python 2.7 and 3.3 succeed without warnings, while Python 3.4 warns about an ignored exception.

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Added file: http://bugs.python.org/file34761/doctest.txt

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