python-typing-extensions fails to build with Python 3.12.0a4.

======================================================================
FAIL: test_base_class (test_typing_extensions.DataclassTransformTests.test_base_class)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/typing_extensions-4.4.0/src/test_typing_extensions.py", line 2994, in test_base_class
    self.assertEqual(
AssertionError: {'eq_[62 chars]e, 'frozen_default': False, 'field_specifiers'[45 chars]rue}} != {'eq_[62 chars]e, 'field_specifiers': (), 'kwargs': {'make_ev[20 chars]rue}}
  {'eq_default': True,
   'field_specifiers': (),
-  'frozen_default': False,
   'kw_only_default': False,
   'kwargs': {'make_everything_awesome': True},
   'order_default': True}

======================================================================
FAIL: test_decorator (test_typing_extensions.DataclassTransformTests.test_decorator)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/typing_extensions-4.4.0/src/test_typing_extensions.py", line 2964, in test_decorator
    self.assertEqual(
AssertionError: {'eq_[62 chars]e, 'frozen_default': False, 'field_specifiers'[14 chars]: {}} != {'eq_[62 chars]e, 'field_specifiers': (), 'kwargs': {}}
  {'eq_default': True,
   'field_specifiers': (),
-  'frozen_default': False,
   'kw_only_default': True,
   'kwargs': {},
   'order_default': False}

======================================================================
FAIL: test_metaclass (test_typing_extensions.DataclassTransformTests.test_metaclass)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/typing_extensions-4.4.0/src/test_typing_extensions.py", line 3025, in test_metaclass
    self.assertEqual(
AssertionError: {'eq_[62 chars]e, 'frozen_default': False, 'field_specifiers'[101 chars]: {}} != {'eq_[62 chars]e, 'field_specifiers': (<class 'test_typing_ex[76 chars]: {}}
  {'eq_default': True,
   'field_specifiers': (<class 'test_typing_extensions.DataclassTransformTests.test_metaclass.<locals>.Field'>,),
-  'frozen_default': False,
   'kw_only_default': False,
   'kwargs': {},
   'order_default': True}

----------------------------------------------------------------------
Ran 261 tests in 0.052s

FAILED (failures=3, skipped=20)

https://docs.python.org/3.12/whatsnew/3.12.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.12/fedora-rawhide-x86_64/05364992-python-typing-extensions/

For all our attempts to build python-typing-extensions with Python 3.12, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.12/package/python-typing-extensions/

Testing and mass rebuild of packages is happening in copr. You can follow these instructions to test locally in mock if your package builds with Python 3.12:
https://copr.fedorainfracloud.org/coprs/g/python/python3.12/

Let us know here if you have any questions.

Python 3.12 is planned to be included in Fedora 39. To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.12.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires), so if this package is required a lot, it's important for us to get it fixed soon.
We'd appreciate help from the people who know this package best, but if you don't want to work on this now, let us know so we can try to work around it on our side.