[racket] mysterious error message

On Tue, Oct 23, 2012 at 1:32 PM, Arthur Nunes-Harwitt <anh at cs.rit.edu> wrote:
> Hi,
>
>   I'm running DrRacket version 5.2.
>
>   In Pretty Big, I get the following error message.
>
>   The variable cl is highlighted in the definitions window, and in the
> interactions window the following text is displayed (partially in red).
>
>   cl: expected cl in: cl
>
>   In R5RS the code runs fine.
>
>   What does this error message mean?  My guess is that it thinks that the
> function is receiving the wrong parameters, but that's incorrect.

Hi Arthur,

Is the code small enough to be posted somewhere, like on
gist.github.com?  I don't know what "cl" is, so seeing the usage in
context might help.