[issue28893] Make sure exceptions raised in __aiter__ are properly chained in ceval

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Should the original exception be stored on the __context__ or the __cause__ attribute? In the latter case you should use _PyErr_FormatFromCause().

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28893>
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