Issue 3968. Report error if cycle in redirecting factory constructors

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

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file

[Brian Wilkerson, 2012/09/28 18:14:37]

nit: Copyright year

 // 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;
 
 public interface ConstructorElement extends MethodElement {
   /**
    * Returns the type of the instances created by this constructor. Note that a constructor in a
    * class may be a default implementation of an interface's constructor.
    */
   ClassElement getConstructorType();
 
   /**
    * @return the {@link ConstructorElement} in default factory class, may be <code>null</code>.
    */
   ConstructorElement getDefaultConstructor();
   
   boolean isSynthetic();
   
   String getRawName();
 
   /**
    * Sets {@link ConstructorElement} in default factory class, may be <code>null</code>.
    */
   void setDefaultConstructor(ConstructorElement defaultConstructor);
+  
+  ConstructorElement getRedirectingFactoryConstructor();
 }