Larry Hastings added the comment:
Oh, and, yes, it's true that Py_RETURN_NONE currently takes advantage of
Py_INCREF being an rvalue, and changing Py_INCREF to a statement would break
the existing implementation. But Py_RETURN_NONE itself is of necessity a
statement. We would simply change Py_RETURN_NONE's implementation to multiple
statements, probably with the do { ... } while(0) trick, so it worked again.
I'd be shocked if that change broke any existing code. So that's no big deal.
Having external code that depends on Py_INCREF being an rvalue is my concern,
and what I hoped you'd bring up on bug #17206.
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<http://bugs.python.org/issue17589>
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