anchor.diff:  
       queue_data = selfcopy%data
     END SUBROUTINE queue_peek
  -END MODULE Gen_Stack
  +END MODULE Gen_Queue
   
   ! Main program, testing.
   ! Author: Thomas Lang
   ! Version: 2015-08-27
  -PROGRAM StackTest
  -  USE Gen_Stack
  +PROGRAM QueueTest
  +  USE Gen_Queue
     USE Node
     IMPLICIT NONE
   
  
positive.code: 
    ! Free the queue
    CALL queue_free(queue)  
  END PROGRAM StackTest
  
negative.code: ! Implementation of a simple queue that holds some generic nodes that hold data.
  ! Author: Thomas Lang
  ! Version: 2015-08-25
  MODULE Gen_Queue
    IMPLICIT NONE
  
    PRIVATE
  