Hi Marius, I'm still not done with the 0.9 version. The current problem is that a glibc update apparently removed --so I would have to patch upstream rust@1.19.0 (rustc-1.19.0-src/src/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cc:163) on staging. Is that known already? Does Rust work on staging (without my changes)? The 0.8.1 mrustc should work--but I don't have the free CPU/memory capacity to test it now. I have an account on bayfront but cannot compile guix there (from manual checkout). I get: error: failed to load 'guix/scripts/pack.scm': ice-9/eval.scm:293:34: no binding `zip' to hide in module (gnu packages compression) even after removing all .go files and removing ~/.cache/guile .