[racket] a problem with image.rkt teachpack

From: Robby Findler (robby at eecs.northwestern.edu)
Date: Fri Sep 6 22:49:51 EDT 2013

Unfortunately, this is the way things work. Those are actually two
different teachpacks and the error message that you are getting is a poorly
worded "these two teachpacks conflict with each other".

Is there perhaps some other behavior you'd prefer?

And, I should also point that even if we do find some fix, there is little
chance that our release schedule can be adjusted to respond to your lab
installation schedule, I'm sorry to say.


On Fri, Sep 6, 2013 at 9:29 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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