Rust 1.16 release status

OK, I’m all caught up on triage of 1.16 issues, and it’s looking pretty ok! Remember 1.16 comes out on 3/16. We’ll aim to start a build on 3/10. And it’s already 3/1!

There’s only one outstanding beta regression, and it’s a release blocker:

There are two additional things on the 1.16 milestone, but they are small matters.

A few new stable regressions have appeared, as well as nightly.