anchor.diff:    }
   
     /// Schedules the process to start and sets [_process].
  -  void _scheduleStartProcess(executable, arguments, options) {
  +  void _scheduleStartProcess(executable,
  +                             arguments,
  +                             workingDirectory,
  +                             environment) {
       var exitCodeCompleter = new Completer();
       _exitCode = new ValueFuture(exitCodeCompleter.future);
   
  
positive.code:   /// Whether the process is expected to terminate at this point.
    var _endExpected = false;
  
    /// Schedules a process to start. [executable], [arguments], and [options]
    /// have the same meaning as for [Process.start]. [description] is a string
    /// description of this process; it defaults to the command-line invocation.
    /// [encoding] is the [Encoding] that will be used for the process's input and
    /// output.
    ///
    /// [executable], [arguments], and [options] may be either a [Future] or a
    /// concrete value. If any are [Future]s, the process won't start until the
    /// [Future]s have completed. In addition, [arguments] may be a [List]
    /// containing a mix of strings and [Future]s.
    ScheduledProcess.start(executable, arguments,
        {options, String description, Encoding encoding: Encoding.UTF_8})
        : _encoding = encoding,
          _explicitDescription = description != null,
          _description = description {
  
negative.code: 
      _updateDescription(executable, arguments);
  
      _scheduleStartProcess(executable, arguments, workingDirectory, environment);
  
      _scheduleExceptionCleanup();
  
  