[issue7583] doctest should normalize tabs when comparing output

[anatoly techtonik]

anatoly techtonik <techtonik at gmail.com> added the comment:

http://docs.python.org/library/doctest.html#how-are-docstring-examples-recognized

"Changed in version 2.4: Expanding tabs to spaces is new; previous versions tried to preserve hard tabs, with confusing results"

Unfortunately, no confusing results survived to see what was wrong.

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<http://bugs.python.org/issue7583>
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