Create ClassElement.type lazily in ClassElementImpl and EnumElementImpl.

pkg/analyzer/lib/src/context/context.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 analyzer.src.context.context;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 714 matching lines @@
    * to stand in for a real one if one does not exist
    * facilitating creation a type provider without dart:async.
    */
   LibraryElement createMockAsyncLib(LibraryElement coreLibrary) {
     InterfaceType objType = coreLibrary.getType('Object').type;
 
     ClassElement _classElement(String typeName, [List<String> parameterNames]) {
       ClassElementImpl element =
           new ClassElementImpl.forNode(AstFactory.identifier3(typeName));
       element.supertype = objType;
-      InterfaceTypeImpl type = new InterfaceTypeImpl(element);
-      element.type = type;
       if (parameterNames != null) {
         int count = parameterNames.length;
         if (count > 0) {
           List<TypeParameterElementImpl> typeParameters =
               new List<TypeParameterElementImpl>(count);
           List<TypeParameterTypeImpl> typeArguments =
               new List<TypeParameterTypeImpl>(count);
           for (int i = 0; i < count; i++) {
             TypeParameterElementImpl typeParameter =
                 new TypeParameterElementImpl.forNode(
                     AstFactory.identifier3(parameterNames[i]));
             typeParameters[i] = typeParameter;
             typeArguments[i] = new TypeParameterTypeImpl(typeParameter);
             typeParameter.type = typeArguments[i];
           }
           element.typeParameters = typeParameters;
-          type.typeArguments = typeArguments;
         }
       }
       return element;
     }
 
     InterfaceType futureType = _classElement('Future', ['T']).type;
     InterfaceType streamType = _classElement('Stream', ['T']).type;
     CompilationUnitElementImpl asyncUnit =
         new CompilationUnitElementImpl("mock_async.dart");
     asyncUnit.types = <ClassElement>[futureType.element, streamType.element];
@@ skipping 1455 matching lines @@
     }
     DartSdk sdk = factory.dartSdk;
     if (sdk == null) {
       throw new IllegalArgumentException(
           "The source factory for an SDK analysis context must have a DartUriResolver");
     }
     return new AnalysisCache(
         <CachePartition>[AnalysisEngine.instance.partitionManager.forSdk(sdk)]);
   }
 }