[issue16522] Add 'FAIL_FAST' flag to doctest

[Roundup Robot]

Roundup Robot added the comment:

New changeset 966432a0734c by R David Murray in branch 'default':
#16522: Add FAIL_FAST flag to doctest.
http://hg.python.org/cpython/rev/966432a0734c

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nosy: +python-dev

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