Error reporting on File in dart:io

runtime/bin/directory_impl.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
-// Used for holding error code and error message for failed OS system calls.
-class _OSStatus {
-  int _errorCode;
-  String _errorMessage;
-}
-
-
 class _Directory implements Directory {
   static final kCreateRequest = 0;
   static final kDeleteRequest = 1;
   static final kExistsRequest = 2;
   static final kCreateTempRequest = 3;
   static final kListRequest = 4;
 
   _Directory(String this._path);
   _Directory.current() : _path = _current();
 
   static String _current() native "Directory_Current";
   static String _createTemp(String template,
-                            _OSStatus status) native "Directory_CreateTemp";
+                            OSError osError) native "Directory_CreateTemp";
   static int _exists(String path) native "Directory_Exists";
   static bool _create(String path) native "Directory_Create";
   static bool _delete(String path, bool recursive) native "Directory_Delete";
   static SendPort _newServicePort() native "Directory_NewServicePort";
 
   void exists(void callback(bool exists)) {
     _ensureDirectoryService();
     List request = new List(2);
     request[0] = kExistsRequest;
     request[1] = _path;
@@ skipping 46 matching lines @@
         _path = result;
         callback();
       } else if (_onError != null) {
         _onError("Could not create temporary directory [$_path]: " +
                  "${result[1]}");
       }
     });
   }
 
   void createTempSync() {
-    var status = new _OSStatus();
-    var result = _createTemp(path, status);
+    var osError = new OSError();
+    var result = _createTemp(path, osError);
     if (result != null) {
       _path = result;
     } else {
       throw new DirectoryException(
           "Could not create temporary directory [$_path]: " +
           "${status._errorMessage}",
           status._errorCode);
     }
   }
 
@@ skipping 98 matching lines @@
   }
 
   var _onDir;
   var _onFile;
   var _onDone;
   var _onError;
 
   String _path;
   SendPort _directoryService;
 }