`cargo-mutants` does not build on illumos (small PR attached)

[plaidfinch]

This is due to the outdated fs2's lack of support for that target. I've remediated this issue in #636 by upgrading the dependency to fs4, which also incidentally allows dropping some outdated transitive dependencies and improving lock behavior to bail on error instead of infinitely retrying.

[sourcefrog]

Thanks!

To prevent future regressions: do you know of any easy way to test on Illumos under GitHub Actions?

[plaidfinch]

My understanding is that @oxidecomputer, we use Buildomat in part because there's no native support for Illumos on GitHub Actions runners. I'll ask some of my coworkers and see if there's a workaround that might make things easier for you. Fwiw, I used cargo-mutants for the first time today and it really helped improve a test suite that I'm working on, so thank you very much for making it!

[sourcefrog]

Fwiw, I used cargo-mutants for the first time today and it really helped improve a test suite that I'm working on, so thank you very much for making it!

That's so great, thanks for telling me! I'm a big fan of the Oxide writing and podcasts and if I was going to buy a rack-scale computer you would be top of my list ;)