anchor.diff:                     help: "path to the package root",
                      defaultsTo: ".");
     parser.addOption("in", abbr: "i",
  -                   help: "input(s): may be file or directory",
  -                   defaultsTo: "stdin");
  +                   help: "input(s): may be file or directory");
     parser.addOption("out", abbr: "o",
                      help: "output: may be file or stdout",
                      defaultsTo: "stdout");
  
positive.code:   // off by at max (#workers - 1).
    var p = spawnFunction(worker);
    workerPorts.add(p);
    p.send(new Message(Message.WORK, [sharedEnv, files]), port);
  
    return 0;
  }
  
negative.code:     env.output = new File(env.output).openWrite();
    }
  
    if (args["pretty-print"] == args["lcov"]) {
      fail("Choose either pretty-print or lcov output");
    }
    env.prettyPrint = args["pretty-print"];
    env.lcov = args["lcov"];
  
    try {
      env.workers = int.parse("${args["workers"]}");
    } catch (e) {
      fail("Invalid worker count: $e");
    }
  
    env.verbose = args["verbose"];
  }
  