[issue39599] ABI breakage between Python 3.7.4 and 3.7.5: change in PyGC_Head structure

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> This happens on a custom C module (built via Cython) when using including <internal/pystate.h> with -DPy_BUILD_CORE. I'm not sure it'd happen otherwise.

If you opt-in for the internal C API, you should be prepared to have such issues.

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<https://bugs.python.org/issue39599>
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