Crater is the tool that Rust teams use to check for regressions in the compiler, in order to detect bugs and guide implementation of new features or soundness fixes. If you’ve never seen some results from Crater you can take a look at this report for this pull request as an example.
It started life as ‘Crater’, then a rewrite called ‘Cargobomb’ arrived, and now we’ve decided to bring the ‘Crater’ name back into use! In future we’d like to have all whole-ecosystem regression testing live under the ‘Crater’ umbrella. The rename is still ongoing and you might see references in report urls, but the user-facing rename should be mostly complete - comment on that tracking issue if you spot any we’ve missed!
While you’re thinking about Crater, I’d like to take the opportunity to note that Crater is part of the impl period in the Infrastructure team section - there’s the usual gitter channel and tagged issues with help available, and I’ve recently merged some changes to make it much simpler to get started locally with Crater, so there’s no time like the present to get involved!