Mathew Kurian:
However, in the case of universe/world teachpacks, where the use of
states is a vital component, a set of code can get very long,
especially if the program is very complex and contains multiple
structures (in some cases structures inside structures inside
structures) within the states.
I agree with the critique of lengthy expressions involving nested
records (structs).
Here's how I deal with it:
http://gist.github.com/364754
The particular solution is for R6RS but PLT has the necessary mechanisms
for it.
Ed
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