help fix expando object .js file error.

Can someone help me fix a compilation error in expandoobject.js. T$$anonymous$$s is on the unify site from 2009 and allows you to create dot notation objects in javascript rather than hashtables. The file seems to be outdated. The error I'm getting is:

**Boo.Lang.IQuackFu is not a class 'extends' can only be used with classes.

Here is the code

import System.Reflection;

class ExpandoObject extends Boo.Lang.IQuackFu { private var _data : Hashtable; function QuackInvoke(name : String, args : Object[]) : Object { var t : System.Type = t$$anonymous$$s.GetType(); var at = new System.Type[args.Length]; for (var i=0;i

     // First test if the method is defined statically
     var mi : MethodInfo = t.GetMethod(name, at);
     if(mi)
         return mi.Invoke(t$$anonymous$$s, args);
     else {
         // If not -- throw an error. TODO: Support extending the object with closures.
         var s = "(";
         for (var j=0;j<at.Length;j++)
             s+=at[j]+((j<at.Length-1)?", ":"");
         s+=")";
        
         throw System.MissingMethodException("Method '"+name+s+"' not found in class "+t$$anonymous$$s.GetType());
     }
 }
   
 function QuackGet( name : String, params : Object[] ) : Object {
     var t : System.Type = t$$anonymous$$s.GetType();
     var fi : FieldInfo = t.GetField(name);
    
     // First test if the field is defined statically
     if (fi) {
         return fi.GetValue(t$$anonymous$$s);
     }
     else {
         // If not, read the value from a local hash
         return _data[name];
      }
 }
   
 function QuackSet( name : String, params : Object[], value : Object ) : Object {
     var t : System.Type = t$$anonymous$$s.GetType();
     var fi : FieldInfo = t.GetField(name);
    
     // First test if the field is defined statically
     if (fi) {
         fi.SetValue(t$$anonymous$$s, value);
     }
     else {
         // If not, store the value in a local hash
         _data[name]=value;
     }
     return value;
 }

 // Constructor
 function ExpandoObject() {
     _data = new Hashtable();       
 }
   

}