BadDependencyError when assigning an inherited classmethod to a variable

[Avasam]

See https://github.com/python/typeshed/pull/12991/files#diff-75dfb84f0ad6ea28f6880f12c95f276b475cd3f908f0efaaee59217a16de05a3L57-R60
Permalink: https://github.com/Avasam/typeshed/blob/063be1660a9589c1c07fb6e96af275c822d42789/stubs/setuptools/setuptools/__init__.pyi#L58-L59

Replacing

from .discovery import _Finder
find_packages = _Finder.find
find_namespace_packages = _Finder.find

With

from .discovery import PackageFinder, PEP420PackageFinder
find_packages = PackageFinder.find
find_namespace_packages = PEP420PackageFinder.find

Where those classes are defined as:

class _Finder:
    ALWAYS_EXCLUDE: ClassVar[tuple[str, ...]]
    DEFAULT_EXCLUDE: ClassVar[tuple[str, ...]]
    @classmethod
    def find(cls, where: StrPath = ".", exclude: Iterable[str] = (), include: Iterable[str] = ("*",)) -> list[str]: ...

class PackageFinder(_Finder):
    ALWAYS_EXCLUDE: ClassVar[tuple[str, ...]]

class PEP420PackageFinder(PackageFinder): ...

Causes the following errors https://github.com/python/typeshed/actions/runs/11769652125/job/32780972631?pr=12991#step:8:1937

stubs/fanstatic/fanstatic/__init__.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/fanstatic/fanstatic/compiler.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/fanstatic/fanstatic/publisher.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/fanstatic/fanstatic/registry.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/fanstatic/fanstatic/wsgi.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/libsass/sassutils/distutils.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/setuptools/setuptools/__init__.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/setuptools/setuptools/build_meta.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/setuptools/setuptools/command/easy_install.pyi (3.12): pytype.load_pytd.BadDependencyError: Unknown module setuptools, referenced from 'setuptools.command.easy_install'

stubs/setuptools/setuptools/command/editable_wheel.pyi (3.12): pytype.load_pytd.BadDependencyError: Unknown module setuptools, referenced from 'setuptools.command.editable_wheel'

stubs/setuptools/setuptools/command/egg_info.pyi (3.12): pytype.load_pytd.BadDependencyError: Unknown module setuptools, referenced from 'setuptools.command.egg_info'

stubs/setuptools/setuptools/command/test.pyi (3.12): pytype.load_pytd.BadDependencyError: No PEP420PackageFinder.find in module setuptools.discovery, referenced from 'setuptools'

stubs/setuptools/setuptools/discovery.pyi (3.12): pytype.load_pytd.BadDependencyError: Unknown module setuptools, referenced from 'setuptools.dist'

stubs/setuptools/setuptools/dist.pyi (3.12): pytype.load_pytd.BadDependencyError: Unknown module setuptools, referenced from 'setuptools.dist'