Guix performed the bootstrap from mrustc 0.8 for rust 1.19 all the way to rust 1.28 in 2018: https://guix.gnu.org/en/blog/2018/bootstrapping-rust/ https://guix.

Guix performed the bootstrap from mrustc 0.8 for rust 1.19 all the way to rust 1.28 in 2018: https://guix.gnu.org/en/blog/2018/bootstrapping-rust/ https://guix.gnu.org/en/blog/2018/bootstrapping-rust/ Since them they've bootstrapped this all the way to 1.50: https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/rust.scm#n1454 https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages... The work done here is non trivial, this chain of versions are required for the final binary to be reproducible.