New virtualenv breaks tox CI

[gaborbernat]

https://github.com/tox-dev/tox/actions/runs/16986047889/job/48155092461 seems importing winreg is no longer optional 🤔

cc @esafak

[esafak]

Never heard of that module. How come tests pass here?

[gaborbernat]

That is a mistery for now, but seems related to the discovery changes 🤔

[esafak]

I don't understand how IS_WIN = sys.platform == "win32" is True in Ubuntu and MacOS:

virtualenv/src/virtualenv/discovery/builtin.py

Lines 153 to 154 in a1ed8bb

	if IS_WIN:
	from .windows import propose_interpreters # noqa: PLC0415

.tox/3.14/lib/python3.14/site-packages/virtualenv/discovery/builtin.py:154: in propose_interpreters
    from .windows import propose_interpreters  # noqa: PLC0415

[gaborbernat]

Turned out this is a bug in downstream test suite, see tox-dev/tox#3589 (comment) for details.

[esafak]

🐒 patch bad, ooh ooh, ah ah! (Sorry, couldn't resist.)