Is there a mailing list I can subscribe to that will tell me when I can turn this on? I'm hoping not to have to listen to rust-dev for the trigger phrase.
I don't know off the top of my head because it's been a while since we talked about it and I haven't paid super close attention to rustup's development. I am assuming that we would make an announcement on the blog because we'd want to be very clear about what's going on, and of course, try to convince people to opt in :)