- String array should be const.

sdk/lib/io/socket.dart

 // Copyright (c) 2013, 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.
 
 part of dart.io;
 
 
 /**
  * [InternetAddressType] is the type an [InternetAddress]. Currently,
  * IP version 4 (IPv4) and IP version 6 (IPv6) are supported.
@@ skipping 399 matching lines @@
  */
 class RawSocketEvent {
   static const RawSocketEvent READ = const RawSocketEvent._(0);
   static const RawSocketEvent WRITE = const RawSocketEvent._(1);
   static const RawSocketEvent READ_CLOSED = const RawSocketEvent._(2);
   static const RawSocketEvent CLOSED = const RawSocketEvent._(3);
   final int _value;
 
   const RawSocketEvent._(this._value);
   String toString() {
-    return ['RawSocketEvent:READ',
-            'RawSocketEvent:WRITE',
-            'RawSocketEvent:READ_CLOSED',
-            'RawSocketEvent:CLOSED'][_value];
+    return const ['RawSocketEvent:READ',
+                  'RawSocketEvent:WRITE',
+                  'RawSocketEvent:READ_CLOSED',
+                  'RawSocketEvent:CLOSED'][_value];
   }
 }
 
 /**
  * The [RawSocket] is a low-level interface to a socket, exposing the raw
  * events signaled by the system. It's a [Stream] of [RawSocketEvent]s.
  */
 abstract class RawSocket implements Stream<RawSocketEvent> {
   /**
    * Set or get, if the [RawSocket] should listen for [RawSocketEvent.READ]
@@ skipping 306 matching lines @@
     }
     if (address != null) {
       sb.write(", address = ${address.host}");
     }
     if (port != null) {
       sb.write(", port = $port");
     }
     return sb.toString();
   }
 }