Let Backend determine support for deferred loading.

pkg/compiler/lib/src/warnings.dart

 // Copyright (c) 2011, 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 dart2js;
 
 const DONT_KNOW_HOW_TO_FIX = "Computer says no!";
 
 /**
  * The messages in this file should meet the following guide lines:
@@ skipping 1346 matching lines @@
   static const MessageKind MISSING_FACTORY_KEYWORD = const MessageKind(
       "Did you forget a factory keyword here?");
 
   static const MessageKind NO_SUCH_METHOD_IN_NATIVE =
       const MessageKind(
           "'NoSuchMethod' is not supported for classes that extend native "
           "classes.");
 
   static const MessageKind DEFERRED_LIBRARY_DART_2_DART =
       const MessageKind(
-          "Deferred loading is not supported by the dart backend yet."
+          "Deferred loading is not supported by the dart backend yet. "

[Anders Johnsen, 2015/06/08 08:06:29]

?

[Johnni Winther, 2015/06/08 08:42:36]

Needed between '... yet.' and 'The output ...'.

           "The output will not be split.");
 
   static const MessageKind DEFERRED_LIBRARY_WITHOUT_PREFIX =
       const MessageKind(
           "This import is deferred but there is no prefix keyword.",
           howToFix:
             "Try adding a prefix to the import.");
 
   static const MessageKind DEFERRED_OLD_SYNTAX =
       const MessageKind(
@@ skipping 1210 matching lines @@
   static String convertToString(value) {
     if (value is ErrorToken) {
       // Shouldn't happen.
       return value.assertionMessage;
     } else if (value is Token) {
       value = value.value;
     }
     return '$value';
   }
 }