[racket] a problem with image.rkt teachpack

From: Marco Morazan (morazanm at gmail.com)
Date: Sat Sep 7 00:34:20 EDT 2013

Hi Elena,

You can also remove the teachpack from column one. It is, however, simple
enough for students to only add the teachpack in column 2. Once you add a
teachpack,  it remains added until it is removed. My first year students
run DrRacket without removing the teachpack all semester.

 On Sep 6, 2013 10:42 PM, "Elena Machkasova" <elenam at morris.umn.edu> wrote:

> Good evening,
> this may've come up before, but I looked through the last few messages and
> did a bit of searching, and couldn't find anything about this problem. My
> apologies if this is already a known issue.
> When DrRacket is installed, it comes with 3 pre-installed teachpacks,
> including image.rkt. However, image functions (rotate, square, etc) are
> undefined. Installing the teachpack from the middle column in the "add
> teachpack" list fixes the issue.
> However, if the user then tries to add the teachpack and happens to click
> on it in the first column, they get an error message "module: identifier
> already imported from a different source". The solution that seems to work
> then is to clear both teachpacks and then install the one in the middle
> column.
> This behavior takes place for both Racket 5.3.4 and 5.3.6, for Windows and
> Linux (Fedora 18). I don't know if it's happening on a Mac as well.
> If there is a plan to fix it in the next release, could you let me know?
> We might wait a couple of weeks to upgrade our lab to 5.3.6 is we can get
> an upgrade with this issue fixed.
> Many thanks!
> Elena
> University of Minnesota, Morris
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