[issue46454] '0 -> /dev/null' is lost

[tongxiaoge]

Change by tongxiaoge <shixuantong at huawei.com>:


Added file: https://bugs.python.org/file50574/python3.4.6-out.png

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46454>
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