Avoid name collision with reserved word

pkg/intl/lib/generate_localized.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.
 
 /**
  * This provides utilities for generating localized versions of
  * messages. It does not stand alone, but expects to be given
  * TranslatedMessage objects and generate code for a particular locale
  * based on them.
  *
@@ skipping 67 matching lines @@
 
   Message get message => translated;
 
   toString() => id.toString();
 }
 
 /**
  * We can't use a hyphen in a Dart library name, so convert the locale
  * separator to an underscore.
  */
-String _libraryName(String x) => x.replaceAll('-', '_');
+String _libraryName(String x) => 'messages_' + x.replaceAll('-', '_');
 
 /**
  * Generate a file <[generated_file_prefix]>_messages_<[locale]>.dart
  * for the [translations] in [locale] and put it in [targetDir].
  */
 void generateIndividualMessageFile(String locale,
     Iterable<TranslatedMessage> translations, String targetDir) {
   var result = new StringBuffer();
   locale = new MainMessage().escapeAndValidateString(locale);
   result.write(prologue(locale));
@@ skipping 29 matching lines @@
  * parameterized by [locale].
  */
 String prologue(String locale) => """
 /**
  * DO NOT EDIT. This is code generated via pkg/intl/generate_localized.dart
  * This is a library that provides messages for a $locale locale. All the
  * messages from the main program should be duplicated here with the same
  * function name.
  */
 
-library messages_${locale.replaceAll('-','_')};
+library ${_libraryName(locale)};
 import 'package:$intlImportPath/intl.dart';
 import 'package:$intlImportPath/message_lookup_by_library.dart';
 
 final messages = new MessageLookup();
 
 class MessageLookup extends MessageLookupByLibrary {
 
   get localeName => '$locale';
 """;
 
@@ skipping 74 matching lines @@
   // return lib == null ? new Future.value(false) : lib.load();
   return new Future.value(true);
 }
 
 MessageLookupByLibrary _findGeneratedMessagesFor(locale) {
   var actualLocale = Intl.verifiedLocale(locale, (x) => _findExact(x) != null);
   if (actualLocale == null) return null;
   return _findExact(actualLocale);
 }
 """;