[issue21740] doctest doesn't allow duck-typing callables

[Guido van Rossum]

Guido van Rossum added the comment:

Class doctests are already supported separately, see https://docs.python.org/3/library/doctest.html#which-docstrings-are-examined

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nosy: +Guido.van.Rossum

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21740>
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