[issue31619] Strange error when convert hexadecimal with underscores to int

[Nitish]

Nitish <nitishchandrachinta at gmail.com> added the comment:

>> PR 3816 fixes the symptom, but not the core issue -- an overflow check depending on undefined behaviour.

> I don't understand this check completely actually. When exactly is an int too large to convert?

We see if digits * bits_per_char + PyLong_SHIFT -1 overflows an int?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31619>
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