[issue29581] __init_subclass__ causes TypeError when used with standard library metaclasses (such as ABCMeta)

[Ivan Levkivskyi]

Changes by Ivan Levkivskyi <levkivskyi at gmail.com>:


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nosy: +levkivskyi

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29581>
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