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The macOS + Python 2.7 build currently fails because the "coverage" entry point is installed outside of PATH. I think I got hit by this when working on the macOS tests, and added a workaround in _travis/run.sh.
The workaround stopped being necessary at some point, which is why we did not notice when the switch to Nox broke it. Now there's a bug in virtualenv's rewrite, so we need the workaround again. But this time we know where the bug is, and will be able to remove the workaround when virtualenv fixes this issue.
By the way, I found out about https://github.com/MacPython/terryfy today, which could allow us to remove some of the boilerplate. But I think I'd rather migrate to GitHub Actions that to continue investing time in our Travis macOS builds.