Hi Eric! Nice!
1. Try using 'guix environment --ad-hoc gcc gcc:lib'. 2. I thought about this. Maybe we could add a cargo subcommand that interacts with the guix/nix daemon directly [0] and then have a small cargo-build-system that wraps it. I think this would be neat because we could avoid repackaging all rust crates and nixos could maybe reuse it too. Otherwise we are rewriting a lot of stuff that cargo already does really well (not like python and ruby package managers for example) [0] https://github.com/rust-lang/cargo/wiki/Third-party-cargo-subcommands
