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Argh argh argh.

This is a result of fixing bug #963956.  While the fix was well-
intentioned, I don't know if it's really the right thing... I suspect 
putting a more informative message in module_new might suffice.

Raymond's way of fixing the bug also neatly (and 
presumbably accidentally) sidestepped the tests that attempted to 
make sure you got a decent error message for this.

Raymond, what do you think?  I don't think the check in 
ceval.c:build_class can survive as is.