package{
    public class A {
       var test:String;
       public function A()
       }

}
 class B{

}

package
{
    public class A 
    {
       var test:String;

       public function A()
       {
          var b:B = new B();
       }
    }
}
class B
{
   public function B()
   {
       trace('class B');
   }
}