<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">It's the same error with or without. Here's the error:<div><br></div><div>match: color does not refer to a structure definition</div><div><br></div><div>Here are two complete source files (no teachpacks), running Adv. Student, DrRacket 5.1.3.</div><div><br></div><div><div><font class="Apple-style-span" face="'Courier New'">;; begin file 1</font></div><div><font class="Apple-style-span" face="'Courier New'">(match (make-color 1 2 3)</font></div><div><font class="Apple-style-span" face="'Courier New'">  [(struct color (r g b)) (+ r g b)])</font></div></div><div><font class="Apple-style-span" face="'Courier New'"><br></font></div><div><font class="Apple-style-span" face="'Courier New'">;; begin file 2</font></div><div><div><font class="Apple-style-span" face="'Courier New'">(require 2htdp/image)</font></div><div><font class="Apple-style-span" face="'Courier New'">(match (make-color 1 2 3)</font></div><div><font class="Apple-style-span" face="'Courier New'">  [(struct color (r g b)) (+ r g b)])</font></div></div><div><div><div><br></div><div>On Oct 31, 2011, at 9:39 PM, Robby Findler wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Is make-color coming from 2htdp/image? I see that's not working (not<br>sure why yet).<br><br>Robby<br></div></blockquote></div><br></div></body></html>