[issue21124] _struct module compilation error under Cygwin 1.7.17 on Python 3.4

[Masayuki Yamamoto]

Masayuki Yamamoto added the comment:

unpack_iterator type has not been registered into _struct module. And all users get only unpack_iterator object from function returning iterator. The object iterating doesn't need reference to type. Therefore, I think issue finish by PyType_Ready fix because this segfault doesn't have big impact.

However, I think if possible, it is preferable that extension module having un-initialize type objects gets a compile error at build time. And impossible case for compile error is better that wrong extension module always fails import.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21124>
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