[issue43988] Add test.support.check_disallow_instantiation()

[Erlend E. Aasland]

Change by Erlend E. Aasland <erlend.aasland at innova.no>:


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resolution: fixed -> 
status: closed -> open
versions: +Python 3.10

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43988>
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