error:
       … while evaluating a branch condition
         at «string»:25:5:
           24|     v:
           25|     if !builtins.isAttrs v || isDrv v then
             |     ^
           26|       v

       … in the left operand of the OR (||) operator
         at «string»:25:28:
           24|     v:
           25|     if !builtins.isAttrs v || isDrv v then
             |                            ^
           26|       v

       … while evaluating definitions from `/nix/store/9iv83r72z5xwgylkwms1qip1ijnr6jqs-source/modules/transposition.nix':

       … while evaluating definitions from `/nix/store/bn2si2g7z7pl3286bb53fdkhwva1ibfh-source/modules/checks/machines.nix, via option perSystem':

       … while evaluating the option `system.build.toplevel':

       … while evaluating definitions from `/nix/store/8rspa3aapf39mfhc02i19i7d31hszlbj-source/nixos/modules/system/activation/top-level.nix':

       … while evaluating the option `warnings':

       … while evaluating definitions from `/nix/store/8rspa3aapf39mfhc02i19i7d31hszlbj-source/nixos/modules/system/boot/systemd.nix':

       … while evaluating the option `systemd.services.home-manager-cameron.serviceConfig':

       … while evaluating definitions from `/nix/store/da7apr6rx9mpa0ljpircmwwsxnmrjb43-source/nixos':

       … while evaluating the option `home-manager.users.cameron.home.file."/home/cameron/.config/fontconfig/conf.d/10-hm-fonts.conf".source':

       … while evaluating definitions from `/nix/store/da7apr6rx9mpa0ljpircmwwsxnmrjb43-source/modules/misc/xdg':

       … while evaluating the option `home-manager.users.cameron.xdg.configFile."fontconfig/conf.d/10-hm-fonts.conf".source':

       … while evaluating definitions from `/nix/store/da7apr6rx9mpa0ljpircmwwsxnmrjb43-source/modules/misc/fontconfig.nix':

       … while evaluating the option `home-manager.users.cameron.fonts.fontconfig.configFile.fonts.source':

       … while evaluating definitions from `/nix/store/da7apr6rx9mpa0ljpircmwwsxnmrjb43-source/modules/misc/fontconfig.nix':

       … while evaluating the option `home-manager.users.cameron.fonts.fontconfig.configFile.fonts.settings':

       … while evaluating definitions from `/nix/store/da7apr6rx9mpa0ljpircmwwsxnmrjb43-source/modules/misc/fontconfig.nix':

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: write of 72 bytes: Broken pipe