[issue5996] abstract class instantiable when subclassing built-in types

[Irit Katriel]

Change by Irit Katriel <iritkatriel at yahoo.com>:


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versions: +Python 3.10, Python 3.9 -Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4, Python 3.5, Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue5996>
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