[issue38542] [3.7] clean extern PyGC_Head *_PyGC_generation0; in Include/objimpl.h

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

If it's specific to 2.7, why does the Version metadata say 3.7?

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nosy: +gvanrossum

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<https://bugs.python.org/issue38542>
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