Issue 3968. Report error if cycle in redirecting factory constructors

compiler/java/com/google/dart/compiler/resolver/DynamicElementImplementation.java

 // 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.
 
 package com.google.dart.compiler.resolver;
 
 import com.google.common.collect.ImmutableSet;
 import com.google.dart.compiler.ast.DartExpression;
 import com.google.dart.compiler.ast.LibraryUnit;
 import com.google.dart.compiler.type.DynamicType;
@@ skipping 93 matching lines @@
   public boolean isSynthetic() {
     return true;
   }
 
   @Override
   public ConstructorElement getDefaultConstructor() {
     throw new UnsupportedOperationException();
   }
 
   @Override
+  public ConstructorElement getRedirectingFactoryConstructor() {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
   public void setDefaultConstructor(ConstructorElement defaultConstructor) {
     throw new UnsupportedOperationException();
   }
 
   @Override
   public boolean isStatic() {
     return false;
   }
 
   @Override
@@ skipping 182 matching lines @@
   @Override
   public int getOpenBraceOffset() {
     return -1;
   }
   
   @Override
   public int getCloseBraceOffset() {
     return -1;
   }
 }