Alexander Belopolsky <[EMAIL PROTECTED]> added the comment:

One more question: What is the rationale for

+       res = (*it->ob_type->tp_iternext)(it);
+       if (res == NULL) {
..
+                       PyErr_SetNone(PyExc_StopIteration);
+                       return NULL;

?

I would think tp_iternext failing to set an exception should not be 
translated into stop iteration.  Instead, builtin_next() should return 
NULL without an exception set and thus trigger a SystemError.

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Tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue2719>
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