[issue3694] Undetected error in _struct.pack_into

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

The problem is that, unlike PyInt_AsSsize_t, PyLong_AsSsize_t expects
its argument to already be a long object and else raises the SystemError.

It should probably behave like PyInt_AsSsize_t and raise the TypeError
since in 3.0 it's used in many places where PyInt_AsSsize_t was used.

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nosy: +georg.brandl

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