[issue17206] Py_XDECREF() expands its argument multiple times

[Illia Polosukhin]

Illia Polosukhin added the comment:

Amaury, 

   I didn't update Py_INCREF macro in this patch (because it doesn't expand it's argument multiple times) - so the examples you are showing will be working fine. 

   I've updated Py_XINCREF, but it can't be used as an expression anyway.

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<http://bugs.python.org/issue17206>
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