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

From: Fred G. Martin (fredm at cs.uml.edu)
Date: Tue Oct 14 22:59:45 EDT 2008

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:


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,

Posted on the users mailing list.