[racket] a problem with image.rkt teachpack

From: Elena Machkasova (elenam at morris.umn.edu)
Date: Sun Sep 8 15:34:08 EDT 2013

Thanks, Robby and Marco!

Yes, such things may be difficult to change - that's totally 
understandable! I think a significant part of the confusion is that 
these teachpacks are listed under "Pre-installed" which seems to mean 
that they are already there when DrRacket is installed, and that there 
are two teachpacks with the same name. Perhaps using wording other than 
"pre-installed" and renaming one of the taechpacks (if possible; I know 
that sometimes there are dependencies that make it very difficult) would 

I posted a detailed clarification for my students, and hopefully they 
are all set.

And I generally don't ask them to remove teachpacks either, but once 
they've added the wrong one (and many of them added both), it's easier 
at this point to just clear all and add it again than to make sure that 
they remove the one they should.



On 9/6/2013 9:49 PM, Robby Findler wrote:
> 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.
> Robby
> On Fri, Sep 6, 2013 at 9:29 PM, Elena Machkasova 
> <elenam at morris.umn.edu <mailto: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
>     ____________________
>      Racket Users list:
>     http://lists.racket-lang.org/users

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