Fixes RawReceivePort.hashCode

tests/isolate/raw_port_test.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.
 
 // Test RawReceivePort.
 
 library raw_port_test;
 import 'dart:isolate';
 import 'package:unittest/unittest.dart';
 import 'remote_unittest_helper.dart';
@@ skipping 13 matching lines @@
 
   test("raw receive", () {
     RawReceivePort port = new RawReceivePort();
     Isolate.spawn(remote, port.sendPort);
     port.handler = expectAsync((v) {
       expect(v, "reply");
       port.close();
     });
   });
 
+  test("raw receive hashCode", () {
+    RawReceivePort port = new RawReceivePort();
+    expect(port.hashCode is int, true);
+    port.close();
+  });
+
   test("raw receive twice - change handler", () {
     RawReceivePort port = new RawReceivePort();
     Isolate.spawn(remote2, port.sendPort);
     port.handler = expectAsync((v) {
       expect(v, "reply 1");
       port.handler = expectAsync((v) {
         expect(v, "reply 2");
         port.close();
       });
     });
@@ skipping 10 matching lines @@
       int ctr = 2;
       port.listen(expectAsync((v) {
                     expect(v, "reply");
                     ctr--;
                     if (ctr == 0) port.close();
                   }, count: 2),
                   onDone: expectAsync((){}));
     });
   });
 }