[Python-3000] __debug__

[Georg Brandl]

Guido just fixed a case in the py3k branch where you could assign to
"None" in a function call.

__debug__ has similar problems: it can't be assigned to normally, but via
keyword arguments it is possible.

This should be fixed; or should __debug__ be thrown out anyway?

Georg

-- 
Thus spake the Lord: Thou shalt indent with four spaces. No more, no less.
Four shall be the number of spaces thou shalt indent, and the number of thy
indenting shall be four. Eight shalt thou not indent, nor either indent thou
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