Support 'implements' clause on typedef mixin applications.

sdk/lib/_internal/compiler/implementation/tree/nodes.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.
 
 part of tree;
 
 abstract class Visitor<R> {
   const Visitor();
 
   R visitNode(Node node);
@@ skipping 224 matching lines @@
   bool get isInterface => identical(beginToken.stringValue, 'interface');
 
   bool get isClass => !isInterface;
 
   Token getBeginToken() => beginToken;
 
   Token getEndToken() => endToken;
 }
 
 class MixinApplication extends Node {
-  final Modifiers modifiers;
   final TypeAnnotation superclass;
   final NodeList mixins;
 
-  MixinApplication(this.modifiers, this.superclass, this.mixins);
+  MixinApplication(this.superclass, this.mixins);
 
   MixinApplication asMixinApplication() => this;
 
   accept(Visitor visitor) => visitor.visitMixinApplication(this);
 
   visitChildren(Visitor visitor) {
-    if (modifiers != null) modifiers.accept(visitor);
     if (superclass != null) superclass.accept(visitor);
     if (mixins != null) mixins.accept(visitor);
   }
 
   Token getBeginToken() => superclass.getBeginToken();
   Token getEndToken() => mixins.getEndToken();
 }
 
 // TODO(kasperl): Let this share some structure with the typedef for function
 // type aliases?
 class NamedMixinApplication extends Node implements MixinApplication {
   final Identifier name;
   final NodeList typeParameters;
+
+  final Modifiers modifiers;
   final MixinApplication mixinApplication;
+  final NodeList interfaces;
 
   final Token typedefKeyword;
   final Token endToken;
 
-  NamedMixinApplication(this.name, this.typeParameters, this.mixinApplication,
+  NamedMixinApplication(this.name, this.typeParameters,
+                        this.modifiers, this.mixinApplication, this.interfaces,
                         this.typedefKeyword, this.endToken);
 
-  Modifiers get modifiers => mixinApplication.modifiers;
   TypeAnnotation get superclass => mixinApplication.superclass;
   NodeList get mixins => mixinApplication.mixins;
 
   MixinApplication asMixinApplication() => this;
   NamedMixinApplication asNamedMixinApplication() => this;
 
   accept(Visitor visitor) => visitor.visitNamedMixinApplication(this);
 
   visitChildren(Visitor visitor) {
     name.accept(visitor);
     if (typeParameters != null) typeParameters.accept(visitor);
+    if (modifiers != null) modifiers.accept(visitor);
+    if (interfaces != null) interfaces.accept(visitor);
     mixinApplication.accept(visitor);
   }
 
   Token getBeginToken() => typedefKeyword;
   Token getEndToken() => endToken;
 }
 
 abstract class Expression extends Node {
   Expression();
 
@@ skipping 1759 matching lines @@
  * argument).
  *
  * TODO(ahe): This method is controversial, the team needs to discuss
  * if top-level methods are acceptable and what naming conventions to
  * use.
  */
 initializerDo(Node node, f(Node node)) {
   SendSet send = node.asSendSet();
   if (send != null) return f(send.arguments.head);
 }