Just upgraded ten or so smaller projects with no compile errors whatsoever. And then one larger project (probably 20k lines of code or so), which just had a few calls to env::set_var() that needed to be wrapped in unsafe, as well as some uses of ref in pattern-matching, which were apparently not needed, so I’m actually glad to be rid of those.

Very happy with that overall. I was already worried, they might introduce too many breaking changes with how long they were working on this edition, but those worries just evaporated.