That was back in 2018. Today mrustc can bootstrap rustc 1.54.0, but current rustc version is 1.80.1. So if the amount of steps still scales similarly, then today we're probably looking at ~26 rustc compilations to get to current version.
And please read that while keeping in mind how Rust compilation times are.
Perhaps? It was already more than that in 2018: https://guix.gnu.org/blog/2018/bootstrapping-rust/
That was back in 2018. Today mrustc can bootstrap rustc 1.54.0, but current rustc version is 1.80.1. So if the amount of steps still scales similarly, then today we're probably looking at ~26 rustc compilations to get to current version.
And please read that while keeping in mind how Rust compilation times are.