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Re: parallel argument evaluation

    I would agree; on the other hand, the degree is quite significant.
    Suppose you define a random-number-generator rand by
    	(define rand
    	  (let ((seed (initial-random-seed)))
    	    (lambda ()
    	      (set! seed (random-update seed))
    and then you write programs like
    	(+ (rand) (rand))
Yes, this is a good example, as was Tiedeman's.  But a very small 
change to your example:

    (- (rand) (rand))

makes even sequential programs unportable!  Sigh ... :-(