[issue39407] Bitfield Union does not work for bit widths greater than 8 bits

[SilentGhost]

Change by SilentGhost <ghost.adh at runbox.com>:


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nosy: +amaury.forgeotdarc, belopolsky, meador.inge
versions:  -Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39407>
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