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Confirmed the segfault with current Python CVS.  Boosted 
priority to the maximum.  Assigned to Raymond, since he 
probably knows most about this.

Dies in tuple_of_constants(), n=1, i=0, on the incref here:

for (i=0 ; i<n ; i++) {
	arg = GETARG(codestr, (i*3));
	constant = PyList_GET_ITEM(consts, arg);
	Py_INCREF(constant);  *** HERE ***
	PyTuple_SET_ITEM(newconst, i, constant);
}

constant is a NULL pointer at the time.