[issue23700] tempfile.NamedTemporaryFile can close too early if used as iterator

[STINNER Victor]

STINNER Victor added the comment:

> Isn't there some discussion somewhere that if iter(x) returns x you probably have buggy code?

I agree that the issue comes from TextIOWrapper.__iter__(),
BufferedReader.__iter__() and FileIO.__iter__() returns simply return
self *and* have a close method. The issue is not "yield from".

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23700>
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