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[3.12] gh-103968: PyType_FromMetaclass: Allow metaclasses with tp_new=NULL (GH-105386) (GH-105697)

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gh-103968: PyType_FromMetaclass: Allow metaclasses with tp_new=NULL (GH-105386)
(cherry picked from commit 2b90796be6)

Co-authored-by: Petr Viktorin <encukou@gmail.com>
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Miss Islington (bot) 2023-06-12 09:24:21 -07:00 • committed by GitHub
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Doc/c-api/type.rst
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@ -258,7 +258,7 @@ The following functions and structs are used to create
(or *Py_tp_base[s]* slots if *bases* is ``NULL``, see below).
Metaclasses that override :c:member:`~PyTypeObject.tp_new` are not
supported.
supported, except if ``tp_new`` is ``NULL``.
(For backwards compatibility, other ``PyType_From*`` functions allow
such metaclasses. They ignore ``tp_new``, which may result in incomplete
initialization. This is deprecated and in Python 3.14+ such metaclasses will