Run miri on CI

[TimDiekmann]

As mentioned in #81 here is a small PR disabling the tests, which are not compatible with miri. Also, I found a few other mem::transmutes. The job will run in the CI, you might want to mark it as required 🙂

[TimDiekmann]

Interestingly, the latest nightly have even more rules for stacked borrows. I tested the branch with 2022-06-23 and it worked. Will investigate it further.

[TimDiekmann]

I tested the latest nightly with anyhow and error-stack, too. As you linked in my other PR, since recently, more work has to be done: dtolnay/anyhow#134.

[TimDiekmann]

Replacing Box with NonNull in error-stack works. However, I sadly don't have enough time to adjust everything for eyre as internally, eyre looks quite different. However, if you basically apply the linked PR everything should work. 🙂

[yaahc]

Yeah, that's the PR mentioned in #59 and doing that bit of work is the thing I've been dragging my feet on for ages hoping someone else would come along to do :/