#install certain version
guix package -i rust@1.46
#install certain version with certain output
guix package -i rust@1.46:cargo
#it seems when one wants additional output one can just do - this is yet to be tested
guix package -i rust@1.46:rustfmt

# On a foreign distro, you can upgrade the build daemon by running:

sudo -i guix pull

#followed by (assuming your distro uses the systemd service management tool):

systemctl restart guix-daemon.service

# updates
guix pull

# update everything except for rust
guix package --do-not-upgrade=rust -u

# delete rust
guix remove rust:cargo
guix remove rust:rustfmt