It downloads a regular Rust nightly build these days. It depends on the specific nightly date (because we use compiler plugins that link to unstable rustc internals), but at least we no longer have to build our own Servo-specific snapshots.
Right, and if the binary toolchains would be built with musl (not targeting musl) statically, we could have a rustc+cargo that works on both glibc and musl, avoiding two versions.
Could you explain what you're referring to? It seems like a total non sequitur, since as far as I know, there has never been any pain (or even rumour of pain) in a Rust upgrade caused by what libc the compiler uses, but rather breakage in the unstable features that servo uses.
If the official rust+cargo was built statically with musl, then a single download would work on glibc and musl distros. Right now, we don't have a download that works on musl, and one has to bootstrap on a glibc system, targeting musl, which makes it impossible to bootstrap rust+cargo on a musl distro without glibc because bootstrapping requires a snapshot.
I really wish downvotes would require a comment so that I knew why the two posts in this thread branch went negative after being positive for a long time. I feel like people treat it like a personal spam filter although it's the same view for everybody. Odd.