[issue8256] input() doesn't catch _PyUnicode_AsString() exception; io.StringIO().encoding is None

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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pull_requests: +427

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8256>
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