This is not actually correct. Guix only ever used a copy of the nix-daemon, because there's no point in reinventing the derivation format or the low-level implementation of functional package management; no other part of nix/nixpkgs has been used to make Guix.
This is not actually correct. Guix only ever used a copy of the nix-daemon, because there's no point in reinventing the derivation format or the low-level implementation of functional package management; no other part of nix/nixpkgs has been used to make Guix.