[plt-scheme] Call for SICP tests and helpful error messages

If anyone is working through SICP using 
"http://www.neilvandyke.org/sicp-plt/", I have two new challenges for you:

1. Help write test suites using "check-expect" from code in the SICP 
book and any code you write for exercises.  See file "test-ch-1.ss" as 
an example.

2. Tell me what new error messages would be helpful for people working 
through SICP, especially ones that save pointless student frustration.  
For a really sorry example, I just added: ``You called "(random 0)". If 
you're doing SICP section 1.2.6, don't use 1 for the first argument of 
"fast-prime?".''

BTW, there is now a version 1.7 in PLaneT.

Thanks,
Neil V.

-- 
http://www.neilvandyke.org/