anchor.diff:          echo >&2
           echo "or set" >&2
           echo >&2
  -        echo "    nix.nixPath = [ \"darwin=${builtins.toString <darwin>}\" ];" >&2
  +        echo "    nix.nixPath = [ \"darwin=$(nix-instantiate --eval -E '<darwin>')\" ];" >&2
           echo >&2
           exit 2
       fi
  
positive.code:         echo "[1;31merror: Changed <darwin-config> but target does not exist, aborting activation[0m" >&2
          echo "Move you configuration.nix or set NIX_PATH:" >&2
          echo >&2
          echo "    nix.nixPath = [ \"darwin-config=${builtins.toString <darwin-config>}\" ];" >&2
          echo >&2
          exit 2
      fi
  
negative.code:         echo >&2
          echo "or set" >&2
          echo >&2
          echo "    nix.nixPath = [ \"nixpkgs=$(nix-instantiate --eval -E '<darwin>')\" ];" >&2
          echo >&2
          exit 2
      fi
  