[racket] match in Advanced Student?

It's the same error with or without. Here's the error:

match: color does not refer to a structure definition

Here are two complete source files (no teachpacks), running Adv. Student, DrRacket 5.1.3.

;; begin file 1
(match (make-color 1 2 3)
  [(struct color (r g b)) (+ r g b)])

;; begin file 2
(require 2htdp/image)
(match (make-color 1 2 3)
  [(struct color (r g b)) (+ r g b)])

On Oct 31, 2011, at 9:39 PM, Robby Findler wrote:

> Is make-color coming from 2htdp/image? I see that's not working (not
> sure why yet).
> 
> Robby

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