[plt-scheme] unbound variable in module in: set-cdr!

>  Have been trying to install simply-scheme.ss, which is available as a pack
> on PlaneT.
> Am getting the message (unbound variable in module in: set-cdr!) despite
> using the pretty big package.
> What am I doing wrong?

Hi myles,

Oh!  You've done nothing wrong; this was my problem.  I had not ported
the package to DrScheme 4.0 at the time that you downloaded the
package, but I've done so now.  Try installing version 1.2 and let me
know if it works ok for you.

By the way, you might be interested in How to Design Programs, which
integrates tightly with DrScheme:

    http://htdp.org/


Best of wishes!