anchor.diff:                                  _stderr._stream._nativeSocket,
                                   _exitHandler._nativeSocket,
                                   status);
  +    _environment = null;  // The environment will not be needed going forward.
       if (!success) {
         throw new ProcessException(_path,
                                    _arguments,
  
positive.code:                                   _stderr._stream._nativeSocket,
                                    _exitHandler._nativeSocket,
                                    status);
        if (!success) {
          completer.completeError(
              new ProcessException(_path,
  
negative.code:                Map<String, String> environment,
                 bool includeParentEnvironment,
                 bool runInShell) {
      if (runInShell) {
        arguments = _getShellArguments(path, arguments);
        path = _getShellCommand();
  