Mark Shannon added the comment:

Mark, it was written 20 years ago. Who knows (or cares) why it was written that 
way?
Let's just write it correctly this time.


Py_INCREF, Py_DECREF, Py_XDECREF and Py_XINCREF should all expand their 
argument exactly once.

Py_CLEAR should expand its argument exactly twice, once as an rvalue, then once 
as an lvalue.

So could we fix Py_DECREF and Py_CLEAR as well, please?

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nosy: +Mark.Shannon

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17206>
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