[issue40025] enum: _generate_next_value_ is not called if its definition occurs after calls to auto()

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan <tir.karthi at gmail.com>:


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nosy: +barry, eli.bendersky, ethan.furman

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40025>
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