Erlend Egeberg Aasland 0a3452e7cf
[3.10] bpo-43988: Add test.support.check_disallow_instantiation() (GH-25757) (GH-26885)
(cherry picked from commit 4f725261c6cf23d259e8fdc205e12b76ef4d2d31, fbff5387c3e1f3904420fa5a27738c6c5881305b, and 8cec740820fc875117bfa7b6bdb10202ebeb8fd5)

Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@innova.no>

Automerge-Triggered-By: GH:vstinner
2021-06-23 16:46:25 -07:00
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