Add missing implementations.

pkg/compiler/lib/src/elements/modelx.dart

 // Copyright (c) 2013, 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 elements.modelx;
 
 import 'elements.dart';
 import '../constants/expressions.dart';
 import '../helpers/helpers.dart';  // Included for debug helpers.
 import '../tree/tree.dart';
@@ skipping 265 matching lines @@
   final Map messageArguments;
 
   ErroneousElementX(this.messageKind, this.messageArguments,
                     String name, Element enclosing)
       : super(name, ElementKind.ERROR, enclosing);
 
   bool get isTopLevel => false;
 
   bool get isSynthesized => true;
 
+  bool get isCyclicRedirection => false;
+
+  PrefixElement get redirectionDeferredPrefix => null;
+
   AbstractFieldElement abstractField;
 
   unsupported() {
     throw 'unsupported operation on erroneous element';
   }
 
   get asyncMarker => AsyncMarker.SYNC;
   Link<MetadataAnnotation> get metadata => unsupported();
   bool get hasNode => false;
   get node => unsupported();
@@ skipping 111 matching lines @@
   }
 
   get nestedClosures {
     throw new UnsupportedError("nestedClosures");
   }
 
   set nestedClosures(_) {
     throw new UnsupportedError("nestedClosures=");
   }
 
+  set redirectionDeferredPrefix(_) {
+    throw new UnsupportedError("redirectionDeferredPrefix=");
+  }
+
   bool get hasNoBody => false;
 
   bool get _hasNoBody => false;
 
   void set effectiveTarget(_) {
     throw new UnsupportedError("effectiveTarget=");
   }
 }
 
 /// A message attached to a [WarnOnUseElementX].
@@ skipping 2703 matching lines @@
   AstElement get definingElement;
 
   bool get hasResolvedAst => definingElement.hasTreeElements;
 
   ResolvedAst get resolvedAst {
     return new ResolvedAst(declaration,
         definingElement.node, definingElement.treeElements);
   }
 
 }