[issue17976] file.write doesn't raise IOError when it should

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

LGTM. But err_flag is not needed, valid error numbers are all nonzero.

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assignee:  -> serhiy.storchaka
stage: needs patch -> commit review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17976>
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