Guido van Rossum <[EMAIL PROTECTED]> added the comment:

> 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.

Wrong; the iternext slot is designed to return NULL without setting an
exception.  See e.g. listiter_next().

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