[plt-scheme] Issue in ver-4.0 with mutable pairs

From: Vinay Sachdev (vinay.sachdev at gmail.com)
Date: Sat Jan 17 10:30:24 EST 2009

 I am reading SICP and i am at the start of chap-3.
 I am using PLT-Scheme ver-4.0 .I ran into problem with
 mutable pairs. it was giving error. So instead of using
 set-car! i used set-mcar!, but then even to create list
 i have to create mutable list.
 I have an older version also(ver-3.71). Is it a bad idea to
 install older version or is there any other way out?
 My main purpose is to do read SICP and do its exercise.
 One more question, is there any other issues with
 PLT-Scheme in later chapters of SICP?
 Please help.

Thanks and Regards
Vinay Sachdev
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