[issue43916] Mark static types newly converted to heap types as immutable: add Py_TPFLAGS_DISALLOW_INSTANTIATION type flag

[STINNER Victor]

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


New changeset 7dcf0f6db38b7ab6918608542d3a0c6da0a286af by Victor Stinner in branch 'master':
bpo-43916: select.devpoll uses Py_TPFLAGS_DISALLOW_INSTANTIATION (GH-25751)
https://github.com/python/cpython/commit/7dcf0f6db38b7ab6918608542d3a0c6da0a286af


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<https://bugs.python.org/issue43916>
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