[ptx]

That would probably be caught by the CI, though, wouldn't it? One of the packages would fail to install in a clean venv and the tests would fail.

[kstrauser]

No, it won't be caught in CI. The old version of pip didn't recognize that as an error condition.

[ArchOversight]

Not if you used the old version of pip. That is hopefully fixed now with the new resolver.

[ptx]

Hm, you're right. I misread it as saying that it would 1) install six, 2) fail to install virtualenv and 3) fail to report an error.

But the old resolver actually installs both packages, even though it should just abort.