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

From: Woodhouse Gregory (gregory.woodhouse at gmail.com)
Date: Tue Oct 14 23:19:43 EDT 2008

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

"The art of asking the right questions in mathematics is more  
important than the art of solving them."
--Georg Cantor


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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