Serialize WarnOnUseElement

tests/compiler/dart2js/serialization/equivalence_test.dart

 // Copyright (c) 2015, 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.
 
 library dart2js.serialization_test;
 
 import 'dart:io';
 import '../memory_compiler.dart';
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/common.dart';
 import 'package:compiler/src/common/resolution.dart';
 import 'package:compiler/src/constants/constructors.dart';
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/diagnostics/invariant.dart';
 import 'package:compiler/src/elements/elements.dart';
 import 'package:compiler/src/elements/visitor.dart';
 import 'package:compiler/src/filenames.dart';
 import 'package:compiler/src/library_loader.dart';
 import 'package:compiler/src/ordered_typeset.dart';
 import 'package:compiler/src/serialization/element_serialization.dart';
 import 'package:compiler/src/serialization/equivalence.dart';
 import 'package:compiler/src/serialization/json_serializer.dart';
 import 'package:compiler/src/serialization/serialization.dart';
 import 'package:expect/expect.dart';
 import 'test_helper.dart';
 
 const TEST_SOURCES = const <String, String>{
   'main.dart': '''
+import 'library.dart';
 import 'deferred_library.dart' deferred as prefix;
 
 asyncMethod() async {}
 asyncStarMethod() async* {}
 syncStarMethod() sync* {}
 get asyncGetter async {}
 get asyncStarGetter async* {}
 get syncStarGetter sync* {}
 
 genericMethod<T>() {}
 
 class Class1 {
   factory Class1.deferred() = prefix.DeferredClass;
   factory Class1.unresolved() = Unresolved;
 }
 ''',
   'deferred_library.dart': '''
 class DeferredClass {
 }
 ''',
+  'library.dart': '''
+class Type {}
+''',
 };
 
 main(List<String> arguments) {
   // Ensure that we can print out constant expressions.
   DEBUG_MODE = true;
 
   Uri entryPoint;
   String outPath;
   bool prettyPrint = false;
   for (String arg in arguments) {
@@ skipping 787 matching lines @@
           'loadLibrary', element1.loadLibrary, element2.loadLibrary);
     }
     // TODO(johnniwinther): Check members.
   }
 
   @override
   void visitErroneousElement(ErroneousElement element1, ErroneousElement element2) {
     check(element1, element2, 'messageKind', element1.messageKind, element2.messageKind);
   }
 }