[racket] Couldn't find a step matching that criterion

The stepper works fine on simple programs.  You can try watching this
video tutorial I made for my students.  It's basic, but it covers the
essentials of using the stepper.
http://www.youtube.com/watch?v=j3X07a-7YRM

Justin

On Sun, Jan 9, 2011 at 9:02 AM, Sayth Renshaw <flebber.crue at gmail.com> wrote:
> I am having a real issue with the stepper. Maybe the programs are too simple
> so far for the stepper, but it doesn't step.
>
> The check syntax feature is great. for the check-color game should the
> stepper work? What is the trick? I just wanted to check the flow by stepping
> through.
> Each time I use it I get "Couldn't find a step matching that criterion"
> No matter what I change select or do.
>
> ;check-color
> ;colour guessing game (target target)(guess guess)
> ;symbol symbol symbol symbol -> string
> ;four color symbols
> (define (check-color target1 target2 guess1 guess2)
>   (cond
>     [(eq? target1 guess1) 'Perfect]
>     [(or (eq? target1 guess1)(eq? target2 guess2))
> 'OneColorAtCorrectPosition]
>     [(or (eq? target1 guess2)(eq? target2 guess1)) 'OneColorOccurs]
>     [else 'NothingCorrect]))
>
> ;(check-color 'red 'green 'green 'red)
> ;'OneColorOccurs
>
> Sayth
>
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