Stop using the Hashable interface.

runtime/bin/websocket.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.
 
 /**
  * Web socket status codes used when closing a web socket connection.
  */
 abstract class WebSocketStatus {
   static const int NORMAL_CLOSURE = 1000;
   static const int GOING_AWAY = 1001;
@@ skipping 39 matching lines @@
    * Sets the callback to be called when a new web socket connection
    * has been established.
    */
   void set onOpen(callback(WebSocketConnection connection));
 }
 
 
 /**
  * Server web socket connection.
  */
-abstract class WebSocketConnection implements Hashable {
+abstract class WebSocketConnection  {

[Mads Ager (google), 2012/09/27 12:48:27]

guess what. In the rest of the file as well.

   /**
    * Sets the callback to be called when a message have been
    * received. The type on [message] is either [:String:] or
    * [:List<int>:] depending on whether it is a text or binary
    * message. If the message is empty [message] will be [:null:].
    */
   void set onMessage(void callback(message));
 
   /**
    * Sets the callback to be called when the web socket connection is
@@ skipping 22 matching lines @@
   /**
    * WebSocketConnection is hashable.
    */
   int hashCode();
 }
 
 
 /**
  * Client web socket connection.
  */
-abstract class WebSocketClientConnection implements Hashable {
+abstract class WebSocketClientConnection  {
   /**
    * Creates a new web socket client connection based on a HTTP client
    * connection. The HTTP client connection must be freshly opened.
    */
   factory WebSocketClientConnection(HttpClientConnection conn,
                                     [List<String> protocols]) {
     return new _WebSocketClientConnection(conn, protocols);
   }
 
   /**
@@ skipping 180 matching lines @@
    */
   void send(data);
 }
 
 
 class WebSocketException implements Exception {
   const WebSocketException([String this.message = ""]);
   String toString() => "WebSocketException: $message";
   final String message;
 }