Delay 'supertype' for ClassElementImpl and EnumElementImpl.

pkg/analyzer/lib/src/generated/resolver.dart

 // Copyright (c) 2014, 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 analyzer.src.generated.resolver;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 3330 matching lines @@
    */
   EnumMemberBuilder(this._typeProvider);
 
   @override
   Object visitEnumDeclaration(EnumDeclaration node) {
     //
     // Finish building the enum.
     //
     EnumElementImpl enumElement = node.name.staticElement as EnumElementImpl;
     InterfaceType enumType = enumElement.type;
-    enumElement.supertype = _typeProvider.objectType;
     //
     // Populate the fields.
     //
     List<FieldElement> fields = new List<FieldElement>();
     List<PropertyAccessorElement> getters = new List<PropertyAccessorElement>();
     InterfaceType intType = _typeProvider.intType;
     String indexFieldName = "index";
     FieldElementImpl indexField = new FieldElementImpl(indexFieldName, -1);
     indexField.final2 = true;
     indexField.synthetic = true;
@@ skipping 7617 matching lines @@
       return null;
     }
     if (identical(node.staticElement, variable)) {
       if (node.inSetterContext()) {
         result = true;
       }
     }
     return null;
   }
 }