[issue16392] import crashes on circular imports in ext modules

[Stefan Behnel]

Stefan Behnel added the comment:

Hmm, we already do that for packages (i.e. when compiling __init__.py). Looks like this just needs to be done for all modules in Py3. And unless there is a compelling reason for Py_InitModule4() not to do it, I think it should be reverted to its Py2 behaviour.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16392>
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