[issue43988] Add test.support.assert_dissallow_instantiation

[Erlend E. Aasland]

Erlend E. Aasland <erlend.aasland at innova.no> added the comment:

I believe we can close this now, Victor. Please reopen if you disagree :)

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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