anchor.diff:        example = ''
           # 'brew tap' with custom Git URL
           tap "user/tap-repo", "https://user@bitbucket.org/user/homebrew-tap-repo.git"
  -
  -        # set arguments for all 'brew cask install' commands
  -        cask_args appdir: "~/Applications", require_sha: true
   
           # 'brew install --with-rmtp', 'brew services restart' on version changes
           brew "denji/nginx/nginx-full", args: ["with-rmtp"], restart_service: :changed
  
positive.code:   );
  
    brewfile = pkgs.writeText "Brewfile" (
      optionalString (cfg.extraConfig != "") ("# Extra config\n" + cfg.extraConfig) +
      brewfileSection "Taps" "tap" cfg.taps +
      brewfileSection "Brews" "brew" cfg.brews +
      brewfileSection "Casks" "cask" cfg.casks +
      masBrewfileSection cfg.masApps +
      brewfileSection "Docker containers" "whalebrew" cfg.whalebrews
    );
  
    brew-bundle-command = concatStringsSep " " (
  
negative.code:       default = [];
        example = [ "mas" ];
        description = "Homebrew brews to install.";
      };
  
      caskArgs = mkOption {
        type = types.submodule caskArgsOptions;
        default = {};
        example = {
          appdir = "~/Applications";
          require_sha = true;
        };
        description = "Arguments to apply to all <option>homebrew.casks</option>.";
      };
  
      casks = mkOption {
  