[plt-scheme] Teachpacks not working

graphics.ss is not a teachpack:

On Sep 25, 2006, at 6:09 PM, Andrey Skylar wrote:

> We got this error when we tried to use world.ss for the animation  
> project:
>
> =====================================================
> Details on the teachpack error.  What I did was click on Language ->
> Add Teachpack, then go up 1 folder level to collects, then open
> graphics/graphics.ss.

When you go one level up from the collects/teachpack directory, you  
import non-teachpack things. That's why all teachpacks are collected  
in the collects/teachpack folder.

For world.ss specifically, adding just the world.ss teachpack should  
be perfectly fine. Works like a charm in my course.

-- Matthias



> Hit the Run button and and an error pops up:
>
> The teachpack file C:\Program Files\PLT\collects\graphics\graphics.ss
> did not load properly.
> teachpack: export of posn? from #<path:C:\Program
> Files\PLT\collects\graphics\graphics.ss> conflicts with already
> existing definitions.
>
> I see that graphics.ss requires graphics-sig.ss, which contains
>
>  (define-signature graphics:posn^
>    (make-posn posn? posn-x posn-y))
>
> I'll bet that this is the source of the irritation, but don't know the
> cure.
>
> - Mike
> ===================================================
>
> -Andrey
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