[issue19985] Not so correct error message when initializing Struct with ill argument

[Xiang Zhang]

Changes by Xiang Zhang <angwerzx at 126.com>:


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versions: +Python 3.6, Python 3.7 -Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue19985>
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