anchor.diff:         then "Read Only:: {blank}"
         else ""
       }
  -    ${ if pkgs.lib.hasAttr "example" value
  +    ${ if lib.hasAttr "example" value
          then ''
           Example::
           +
  
positive.code:     === details
  
      Type:: ${value.type}
      ${ if pkgs.lib.hasAttr "default" value
         then ''
          Default::
          +
  
negative.code: in rec {
    inherit optionsNix;
  
    optionsAsciiDoc = lib.concatStringsSep "\n" (lib.mapAttrsToList singleAsciiDoc optionsNix);
  
    optionsJSON = pkgs.runCommand "options.json"
      { meta.description = "List of NixOS options in JSON format";
  