[issue29270] super call in ctypes sub-class fails in 3.6

[Serhiy Storchaka]

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


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nosy: +ncoghlan, serhiy.storchaka
versions: +Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29270>
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