[issue16619] LOAD_GLOBAL used to load `None` under certain circumstances

[Bruno Dupuis]

Bruno Dupuis added the comment:

To me, the whole issue is at line ~ 480 in peehole.c in the LOAD_NAME/LOAD_GLOBAL switch case.

This explains the difference between `return` and `return None` as the former is actually compiled to LOAD_CONST. OTOH, `return None` has to pass the optim pass to be changed in LOAD_CONST. The real bug is sometime it doesn't.

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<http://bugs.python.org/issue16619>
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