[issue30891] importlib: _find_and_load() race condition on sys.modules[name] check

[STINNER Victor]

STINNER Victor added the comment:

With Python 3.5.4rc1 released (3.5.4 will be the last 3.5 release accepting bug fixes), I'm not sure that it's still worth it to try to backport such changes to Python 3.5. The importlib is very important, any regression can be very important.

I'm not sure that backporting the unit test is interesting. If the test fails, we will be unable to fix it.

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<http://bugs.python.org/issue30891>
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