[issue41531] Python 3.9 regression: Literal dict with > 65535 items are one item shorter

[Matthew Barnett]

Matthew Barnett <python at mrabarnett.plus.com> added the comment:

I think what's happening is that in 'compiler_dict' (Python/compile.c), it's checking whether 'elements' has reached a maximum (0xFFFF). However, it's not doing this after incrementing; instead, it's checking before incrementing and resetting 'elements' to 0 when it should be resetting to 1. The 65535th element isn't counted.

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nosy: +mrabarnett

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<https://bugs.python.org/issue41531>
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