[issue43988] Add test.support.assert_dissallow_instantiation

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:


New changeset fbff5387c3e1f3904420fa5a27738c6c5881305b by Erlend Egeberg Aasland in branch 'main':
bpo-43988: Use check disallow instantiation helper (GH-26392)
https://github.com/python/cpython/commit/fbff5387c3e1f3904420fa5a27738c6c5881305b


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