Start better error reporting for sockets

tests/standalone/src/io/StreamPipeTest.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.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
 #import("dart:io");
@@ skipping 134 matching lines @@
   SendPort _sendPort;
   Socket _socket;
   int _messages;
 }
 
 
 // The testing server will simply pipe each connecting sockets input
 // stream to its output stream.
 class PipeServer extends TestingServer {
   void onConnection(Socket connection) {
-    connection.onError = () { Expect.fail("Socket error"); };
+    connection.onError = (Exception e) { Expect.fail("Socket error $e"); };
     connection.inputStream.pipe(connection.outputStream);
   }
 }
 
 
 // Test piping from one file to another and closing both streams
 // after wards.
 testFileToFilePipe1() {
   // Force test to timeout if one of the handlers is
   // not called.
@@ skipping 119 matching lines @@
   srcStream.pipe(dstStream, close: false);
 }
 
 
 main() {
   testFileToFilePipe1();
   testFileToFilePipe2();
   testFileToFilePipe3();
   PipeServerGame echoServerGame = new PipeServerGame.start();
 }