[issue43988] Add test.support.assert_dissallow_instantiation

[STINNER Victor]

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


New changeset 8cec740820fc875117bfa7b6bdb10202ebeb8fd5 by Erlend Egeberg Aasland in branch 'main':
bpo-43988: Document test.support.check_disallow_instantiation() (GH-26394)
https://github.com/python/cpython/commit/8cec740820fc875117bfa7b6bdb10202ebeb8fd5


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