[issue1643712] Emphasize buffering issues when sys.stdin is used

[Daniel Diniz]

Changes by Daniel Diniz <ajaksu at gmail.com>:


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dependencies: +for line in sys.stdin: doesn't notice EOF the first time
stage:  -> test needed
type:  -> feature request
versions: +Python 3.0

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1643712>
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