[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:

See also bpo-40241: "[C API] Make PyGC_Head structure opaque, or even more it to the internal C API".

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