blueprint-compiler fails to build with Python 3.12.0a3.

Traceback (most recent call last):
  File "/usr/lib/python3.12/site-packages/mesonbuild/mesonmain.py", line 194, in run
    return options.run_func(options)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/mesonbuild/mtest.py", line 2073, in run
    return th.doit()
           ^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/mesonbuild/mtest.py", line 1754, in doit
    self.run_tests(runners)
  File "/usr/lib/python3.12/site-packages/mesonbuild/mtest.py", line 1892, in run_tests
    loop = asyncio.get_event_loop()
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.12/asyncio/events.py", line 676, in get_event_loop
    raise RuntimeError('There is no current event loop in thread %r.'
RuntimeError: There is no current event loop in thread 'MainThread'.

asyncio.get_event_loop() and many other asyncio functions like ensure_future(), shield() or gather(), and also the get_event_loop() method of BaseDefaultEventLoopPolicy now raise a RuntimeError if called when there is no running event loop and the current event loop was not set. Previously they implicitly created and set a new current event loop. DeprecationWarning is no longer emitted if there is no running event loop but the current event loop is set in the policy. (Contributed by Serhiy Storchaka in gh-93453.)

https://github.com/python/cpython/issues/93453
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_64/05133219-blueprint-compiler/

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

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.