[issue17433] stdlib generator-like iterators don't forward send/throw

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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stage:  -> committed/rejected
status: open -> closed
superseder:  -> Implement generator interface in itertools.chain.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17433>
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