[issue17206] Py_XDECREF() expands its argument multiple times

[STINNER Victor]

STINNER Victor added the comment:

> I've attached an updated patch that reuses the _py_tmp variable for those temporary assignments thus keeping the required stack size down.

I don't understand how it would change the size of the C stack, could you please explain? object.patch looks like refactoring to simplify the work of the C preprocessor.

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