Make NamedMixinApplicationElementX and EnumClassElementX implement DeclarationSite.

pkg/compiler/lib/src/resolution/class_hierarchy.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.resolution.class_hierarchy;
 
 import '../common.dart';
 import '../common/resolution.dart' show
     Feature;
 import '../compiler.dart' show
     Compiler;
 import '../core_types.dart' show
     CoreClasses,
     CoreTypes;
 import '../dart_types.dart';
 import '../elements/elements.dart';
 import '../elements/modelx.dart' show
     BaseClassElementX,
     ErroneousElementX,
     MixinApplicationElementX,
     SynthesizedConstructorElementX,
-    TypeVariableElementX;
+    TypeVariableElementX,
+    UnnamedMixinApplicationElementX;
 import '../ordered_typeset.dart' show
     OrderedTypeSet,
     OrderedTypeSetBuilder;
 import '../tree/tree.dart';
 import '../util/util.dart' show
     Link,
     Setlet;
 import '../universe/call_structure.dart' show
     CallStructure;
 
@@ skipping 284 matching lines @@
       supertype = applyMixin(supertype, checkMixinType(link.head), link.head);
       link = link.tail;
     }
     doApplyMixinTo(element, supertype, checkMixinType(link.head));
     return element.computeType(resolution);
   }
 
   DartType applyMixin(DartType supertype, DartType mixinType, Node node) {
     String superName = supertype.name;
     String mixinName = mixinType.name;
-    MixinApplicationElementX mixinApplication = new MixinApplicationElementX(
-        "${superName}+${mixinName}",
-        element.compilationUnit,
-        compiler.getNextFreeClassId(),
-        node,
-        new Modifiers.withFlags(new NodeList.empty(), Modifiers.FLAG_ABSTRACT));
+    MixinApplicationElementX mixinApplication =
+        new UnnamedMixinApplicationElementX(
+          "${superName}+${mixinName}",
+          element.compilationUnit,
+          compiler.getNextFreeClassId(),
+          node);
     // Create synthetic type variables for the mixin application.
     List<DartType> typeVariables = <DartType>[];
     int index = 0;
     for (TypeVariableType type in element.typeVariables) {
       TypeVariableElementX typeVariableElement = new TypeVariableElementX(
           type.name, mixinApplication, index, type.element.node);
       TypeVariableType typeVariable = new TypeVariableType(typeVariableElement);
       typeVariables.add(typeVariable);
       index++;
     }
@@ skipping 29 matching lines @@
 
   FunctionElement createForwardingConstructor(ConstructorElement target,
                                               ClassElement enclosing) {
     FunctionElement constructor =
         new SynthesizedConstructorElementX.notForDefault(
             target.name, target, enclosing);
     constructor.computeType(resolution);
     return constructor;
   }
 
-  void doApplyMixinTo(MixinApplicationElementX mixinApplication,
-                      DartType supertype,
-                      DartType mixinType) {
+  void doApplyMixinTo(
+      MixinApplicationElementX mixinApplication,
+      DartType supertype,
+      DartType mixinType) {
     Node node = mixinApplication.parseNode(resolution.parsing);
 
     if (mixinApplication.supertype != null) {
       // [supertype] is not null if there was a cycle.
       assert(invariant(node, compiler.compilationFailed));
       supertype = mixinApplication.supertype;
       assert(invariant(node, supertype.isObject));
     } else {
       mixinApplication.supertype = supertype;
     }
@@ skipping 323 matching lines @@
     if (e == null || !e.impliesType) {
       reporter.reportErrorMessage(
           node.selector,
           MessageKind.CANNOT_RESOLVE_TYPE,
           {'typeName': node.selector});
       return;
     }
     loadSupertype(e, node);
   }
 }