anchor.diff:      };
       envScript = mkOption {
         default = "${cassandraPackage}/conf/cassandra-env.sh";
  +      defaultText = "\${cassandraPackage}/conf/cassandra-env.sh";
         type = types.path;
         description = "Supply your own cassandra-env.sh rather than using the default";
       };
  
positive.code:     package = mkOption {
        description = "Cassandra package to use.";
        default = pkgs.cassandra;
        type = types.package;
      };
      jre = mkOption {
  
negative.code:     envFile = mkOption {
        description = "path to cassandra-env.sh";
        default = "${cassandraPackage}/conf/cassandra-env.sh";
        defaultText = "\${cassandraPackage}/conf/cassandra-env.sh";
        type = types.path;
      };
      clusterName = mkOption {
  