[racket] structures question

> ;; Posn -> Number.
> ;; A programm for calculating the distance is Manhatten
> (check-expect ( manhatten (make-posn 7 3 ) 10))
> (check-expect ( manhatten (make-posn 1 1 ) 2))
>
> Hi Roelof,

As the
 code is currently written, it looks like it is passing two arguments to
manhatten, rather than one.  Is that right?
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