anchor.diff:              };
               bindDn = mkOption {
                 type = types.str;
  -              default = "";
                 description = ''
                   Bind DN for LDAP access.
                 '';
               };
               bindCredentials = mkOption {
                 type = types.str;
  -              default = "";
                 description = ''
                   Bind credentials for LDAP access.
                 '';
               };
               searchBase = mkOption {
                 type = types.str;
  -              default = "";
                 example = "o=users,dc=example,dc=com";
                 description = ''
                   LDAP directory to begin search from.
  
positive.code:           options = {
              accessKeyId = mkOption {
                type = types.str;
                default = "";
                description = ''
                  AWS access key id.
                '';
              };
              secretAccessKey = mkOption {
                type = types.str;
                default = "";
                description = ''
                  AWS access key.
                '';
              };
              region = mkOption {
                type = types.str;
                default = "";
                description = ''
                  AWS S3 region.
                '';
  
negative.code:           options = {
              consumerKey = mkOption {
                type = types.str;
                description = ''
                  Twitter API consumer key.
                '';
              };
              consumerSecret = mkOption {
                type = types.str;
                description = ''
                  Twitter API consumer secret.
                '';
  