anchor.diff:            are the non-global options permissible for the main host.
           '';
   
  -        # Add the default value for each function which is not defined.
  -        # This should be replaced by sub-modules.
  -        apply =
  -          map (vhost:
  -            addDefaultOptionValues vhostOptions vhost
  -          );
  +        options = [
  +          vhostOptions
  +        ];
         };
   
       }
       // perServerOptions {forMainServer = true;}
       ;
     };
  -}+}
  
positive.code: {config, pkgs, ...}:
  
  let
    inherit (pkgs.lib) mkOption addDefaultOptionValues;
  
    perServerOptions = {forMainServer}: {
  
  
negative.code:             documentRoot = "/data/webroot-bar";
            }
          ];
          type = with types; listOf optionSet;
          description = ''
            Specification of the virtual hosts served by Apache.  Each
            element should be an attribute set specifying the
  