Update elements, nodes and visitors for serialization.

pkg/compiler/lib/src/typechecker.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.
 
 library dart2js.typechecker;
 
 import 'common.dart';
 import 'common/names.dart' show
     Identifiers;
 import 'common/resolution.dart' show
     Resolution;
 import 'common/tasks.dart' show
     CompilerTask;
 import 'compiler.dart' show
     Compiler;
 import 'constants/expressions.dart';
 import 'constants/values.dart';
 import 'core_types.dart';
 import 'dart_types.dart';
 import 'elements/elements.dart' show
     AbstractFieldElement,
     AstElement,
     AsyncMarker,
     ClassElement,
     ConstructorElement,
     Element,
     Elements,
     EnumClassElement,
+    EnumConstantElement,
     ExecutableElement,
     FieldElement,
     FunctionElement,
     GetterElement,
     InitializingFormalElement,
     LibraryElement,
     Member,
     MemberSignature,
     Name,
     ParameterElement,
@@ skipping 1899 matching lines @@
 
       analyze(switchCase);
     }
 
     if (!hasDefaultCase && expressionType.isEnumType) {
       compiler.enqueuer.resolution.addDeferredAction(executableContext, () {
         Map<ConstantValue, FieldElement> enumValues =
             <ConstantValue, FieldElement>{};
         List<FieldElement> unreferencedFields = <FieldElement>[];
         EnumClassElement enumClass = expressionType.element;
-        enumClass.enumValues.forEach((FieldElement field) {
+        enumClass.enumValues.forEach((EnumConstantElement field) {
           ConstantValue constantValue =
               compiler.constants.getConstantValueForVariable(field);
           if (constantValue == null) {
             // The field might not have been resolved.
             unreferencedFields.add(field);
           } else {
             enumValues[constantValue] = field;
           }
         });
 
@@ skipping 45 matching lines @@
 
   visitTypedef(Typedef node) {
     // Do not typecheck [Typedef] nodes.
   }
 
   visitNode(Node node) {
     reporter.internalError(node,
         'Unexpected node ${node.getObjectDescription()} in the type checker.');
   }
 }