Change the error handling in dart:io

runtime/bin/socket.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.
 
 interface ServerSocket default _ServerSocket {
   /**
    * Constructs a new server socket, binds it to a given address and port,
    * and listens on it.
    */
   ServerSocket(String bindAddress, int port, int backlog);
 
   /**
    * The connection handler gets called when there is a new incoming
    * connection on the socket.
    */
   void set onConnection(void callback(Socket connection));
 
   /**
    * The error handler gets called when a socket error occurs.
    */
-  void set onError(void callback(Exception e));
+  void set onError(void callback(e));
 
   /**
    * Returns the port used by this socket.
    */
   int get port();
 
   /**
    * Closes the socket.
    */
   void close();
@@ skipping 50 matching lines @@
   /**
    * The close handler gets called when a the last byte have been read
    * from a socket. At this point the socket might still be open for
    * writing for sending more data.
    */
   void set onClosed(void callback());
 
   /**
    * The error handler gets called when a socket error occurs.
    */
-  void set onError(void callback(Exception e));
+  void set onError(void callback(e));
 
   /**
    * Returns input stream to the socket.
    */
   InputStream get inputStream();
 
   /**
    * Returns output stream of the socket.
    */
   OutputStream get outputStream();
@@ skipping 41 matching lines @@
         sb.add(" ($osError)");
       }
     } else if (osError != null) {
       sb.add(": $osError");
     }
     return sb.toString();
   }
   final String message;
   final OSError osError;
 }