Create ClassElement.type lazily in ClassElementImpl and EnumElementImpl.

pkg/analyzer/lib/src/dart/element/element.dart

Index: pkg/analyzer/lib/src/dart/element/element.dart
diff --git a/pkg/analyzer/lib/src/dart/element/element.dart b/pkg/analyzer/lib/src/dart/element/element.dart
index afe5715ba97dadc724b53fe9e668859bc36933f0..94571086976362e5e5a202d3b79a7e60505a3b45 100644
--- a/pkg/analyzer/lib/src/dart/element/element.dart
+++ b/pkg/analyzer/lib/src/dart/element/element.dart
@@ -49,12 +49,6 @@ abstract class AbstractClassElementImpl extends ElementImpl
   List<FieldElement> _fields;
 
   /**
-   * The type defined by the class.
-   */
-  @override
-  InterfaceType type;
-
-  /**
    * Initialize a newly created class element to have the given [name] at the
    * given [offset] in the file that contains the declaration of this element.
    */
@@ -441,6 +435,11 @@ class ClassElementImpl extends AbstractClassElementImpl
   InterfaceType _supertype;
 
   /**
+   * The type defined by the class.
+   */
+  InterfaceType _type;
+
+  /**
    * A list containing all of the mixins that are applied to the class being
    * extended in order to derive the superclass of this class.
    */
@@ -877,6 +876,16 @@ class ClassElementImpl extends AbstractClassElementImpl
   }
 
   @override
+  InterfaceType get type {
+    if (_type == null) {
+      InterfaceTypeImpl type = new InterfaceTypeImpl(this);
+      type.typeArguments = typeParameterTypes;
+      _type = type;
+    }
+    return _type;
+  }
+
+  @override
   TypeParameterizedElementMixin get typeParameterContext => this;
 
   @override
@@ -3128,6 +3137,11 @@ class EnumElementImpl extends AbstractClassElementImpl {
   final UnlinkedEnum _unlinkedEnum;
 
   /**
+   * The type defined by the enum.
+   */
+  InterfaceType _type;
+
+  /**
    * Initialize a newly created class element to have the given [name] at the
    * given [offset] in the file that contains the declaration of this element.
    */
@@ -3268,6 +3282,16 @@ class EnumElementImpl extends AbstractClassElementImpl {
   InterfaceType get supertype => context.typeProvider.objectType;
 
   @override
+  InterfaceType get type {
+    if (_type == null) {
+      InterfaceTypeImpl type = new InterfaceTypeImpl(this);
+      type.typeArguments = const <DartType>[];
+      _type = type;
+    }
+    return _type;
+  }
+
+  @override
   List<TypeParameterElement> get typeParameters =>
       const <TypeParameterElement>[];