python-argh fails to build with Python 3.10.0rc1.

=================================== FAILURES ===================================
_____________________________ test_invalid_choice ______________________________
    def test_invalid_choice():
        def cmd(args):
            return 1
    
        # root level command
    
        p = DebugArghParser()
        p.add_commands([cmd])
    
>       assert run(p, 'bar', exit=True).startswith('invalid choice')
E       assert False
E        +  where False = <built-in method startswith of str object at 0x7fffb9a853e0>('invalid choice')
E        +    where <built-in method startswith of str object at 0x7fffb9a853e0> = "argument {cmd}: invalid choice: 'bar' (choose from 'cmd')".startswith
E        +      where "argument {cmd}: invalid choice: 'bar' (choose from 'cmd')" = run(DebugArghParser(prog='setup.py', usage=None, description=None, formatter_class=<class 'argh.constants.CustomFormatter'>, conflict_handler='error', add_help=True), 'bar', exit=True)
test/test_integration.py:379: AssertionError
____________________________ test_explicit_cmd_name ____________________________
    def test_explicit_cmd_name():
    
        @argh.named('new-name')
        def orig_name():
            return 'ok'
    
        p = DebugArghParser()
        p.add_commands([orig_name])
>       assert run(p, 'orig-name', exit=True).startswith('invalid choice')
E       assert False
E        +  where False = <built-in method startswith of str object at 0x7fffb9ab7bb0>('invalid choice')
E        +    where <built-in method startswith of str object at 0x7fffb9ab7bb0> = "argument {new-name}: invalid choice: 'orig-name' (choose from 'new-name')".startswith
E        +      where "argument {new-name}: invalid choice: 'orig-name' (choose from 'new-name')" = run(DebugArghParser(prog='setup.py', usage=None, description=None, formatter_class=<class 'argh.constants.CustomFormatter'>, conflict_handler='error', add_help=True), 'orig-name', exit=True)
test/test_integration.py:513: AssertionError
=========================== short test summary info ============================
FAILED test/test_integration.py::test_invalid_choice - assert False
FAILED test/test_integration.py::test_explicit_cmd_name - assert False
============== 2 failed, 72 passed, 2 skipped, 4 xfailed in 0.57s ==============

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.10/fedora-rawhide-x86_64/02359235-python-argh/

For all our attempts to build python-argh with Python 3.10, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.10/package/python-argh/

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 3.10:
https://copr.fedorainfracloud.org/coprs/g/python/python3.10/

Let us know here if you have any questions.

Python 3.10 is already included in Fedora 35. To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.10.
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.