[plt-scheme] can't run SICP "generic operations" code in PLT Scheme 4.1

Since pairs are no longer mutable in PLT Scheme, you can't use set- 
cdr! You probably want to use mutable pairs instead.


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important than the art of solving them."
--Georg Cantor

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On Oct 14, 2008, at 7:59 PM, Fred G. Martin wrote:

> Hey all,
>
> I can't figure out which language pack/ include statement / other
> setting is necessary to run the generic operations package from SICP.
>
> Here are two samples of the code I'm trying to run:
>
> http://www.cs.uml.edu/~holly/91.301/ps6-code.ss
> http://rlai.cs.ualberta.ca/325assignment5.html
>
> The code works fine in PLT-Scheme 3.72 (setting "Textual (MzScheme,
> includes R5RS)" but I am stumped trying to get it to run in 4.1.
>
> In general 4.1 seems to not like redefining stuff... I must admit I am
> mystified by all the language choices.
>
> Thanks for your help,
> Fred
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