Hi, I've updated mrustc to 0.9 now in guix staging commit 5b600fcae65df18c617adc0e5c35e98484e2b3cc. We still aren't bootstrapping Rust 1.29.0 directly from mrustc. This concludes this round's Rust changes to staging from me. Bootstrapping Rust 1.29.0 directly from mrustc will not work in this round.