distlib 0.3.9 breaks virtualenv in zipapp on Windows

[gaborbernat]

The error is 'DistlibFinder' object has no attribute 'iterator'. See https://github.com/pypa/virtualenv/actions/runs/11375057581/job/31644998367?pr=2782

  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "C:\Users\runneradmin\AppData\Local\Temp\pytest-of-unknown\pytest-0\zipapp0\virtualenv.pyz\virtualenv\seed\embed\via_app_data\via_app_data.py", line 17, in <module>
  File "C:\Users\runneradmin\AppData\Local\Temp\pytest-of-unknown\pytest-0\zipapp0\virtualenv.pyz\virtualenv\seed\embed\via_app_data\pip_install\copy.py", line 8, in <module>
    x = copy.deepcopy(y)            # make a deep copy of y
  File "C:\Users\runneradmin\AppData\Local\Temp\pytest-of-unknown\pytest-0\zipapp0\virtualenv.pyz\virtualenv\seed\embed\via_app_data\pip_install\base.py", line 13, in <module>
  File "C:\Users\runneradmin\AppData\Local\Temp\pytest-of-unknown\pytest-0\zipapp0\virtualenv.pyz\__virtualenv__/distlib-0.3.9-py2.py3-none-any/distlib/scripts.py", line 66, in <module>
AttributeError: 'DistlibFinder' object has no attribute 'iterator'

[gaborbernat]

https://distlib.readthedocs.io/en/latest/reference.html#distlib.resources.register_finder says that the finder must implement PEP-302... which only defines for finder:

So where does this iterator come from? Impacted code:

https://github.com/pypa/virtualenv/blob/main/tasks/__main__zipapp.py#L72-L87

[gaborbernat]

cc @pfmoore

[vsajip]

I'm confused - what change in 0.3.9 caused this? Or did it not, seeing as you've closed the issue?