python-anyio fails to build with Python 3.14.0a2.

8 tests failed. The example failures:

_________________________ test_cancel_during[asyncio] __________________________
../BUILDROOT/usr/lib/python3.14/site-packages/anyio/pytest_plugin.py:117: in pytest_pyfunc_call
    runner.run_test(pyfuncitem.obj, testargs)
../BUILDROOT/usr/lib/python3.14/site-packages/anyio/_backends/_asyncio.py:2117: in run_test
    self._raise_async_exceptions()
../BUILDROOT/usr/lib/python3.14/site-packages/anyio/_backends/_asyncio.py:2054: in _raise_async_exceptions
    raise exceptions[0]
/usr/lib64/python3.14/asyncio/events.py:88: in _run
    self._context.run(self._callback, *self._args)
../BUILDROOT/usr/lib/python3.14/site-packages/anyio/_backends/_asyncio.py:1064: in _forcibly_shutdown_process_pool_on_exit
    child_watcher = asyncio.get_event_loop_policy().get_child_watcher()
E   AttributeError: '_UnixDefaultEventLoopPolicy' object has no attribute 'get_child_watcher'

___________________ TestPath.test_is_relative_to[args0-True] ___________________
tests/test_fileio.py:284: in test_is_relative_to
    assert Path("/xyz/abc/foo").is_relative_to(*args) == result
../BUILDROOT/usr/lib/python3.14/site-packages/anyio/_core/_fileio.py:376: in is_relative_to
    self.relative_to(*other)
../BUILDROOT/usr/lib/python3.14/site-packages/anyio/_core/_fileio.py:509: in relative_to
    return Path(self._path.relative_to(*other))
E   TypeError: PurePath.relative_to() takes 2 positional arguments but 3 were given

https://docs.python.org/3.14/whatsnew/3.14.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.14/fedora-rawhide-x86_64/08311144-python-anyio/

For all our attempts to build python-anyio with Python 3.14, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.14/package/python-anyio/

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 3.14:
https://copr.fedorainfracloud.org/coprs/g/python/python3.14/

Let us know here if you have any questions.

Python 3.14 is planned to be included in Fedora 43.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.14.
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.