Iteration with named let

["W. Eliot Kimber" <eliot@xxxxxxxxxx>]

Ok, thanks to the samples from folks, I think I'm starting to understand
this interation stuff (I don't know why it's so hard beyond too many years
doing for and while loops).

Here's a function I created to determine if a child has a particular GI:

(define (has-child? %gi% %element%)
  (let loop ((desc-list (children %element%)))
    (if (equal? (gi (node-list-first desc-list)) %gi%)
       #t
       (if (node-list-empty? desc-list)
          #f
          (loop (node-list-rest desc-list))
      )
    )
  )
)

There's probably an easier way, except that Jade doesn't support
match-element?.

Have I done this correctly? 

Thanks,

Eliot

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