Exercise 5.50.  Use the compiler to compile the metacircular evaluator 
of section 4.1 and run this program using the register-machine 
simulator. (To compile more than one definition at a time, you can 
package the definitions in a begin.) The resulting interpreter will run 
very slowly because of the multiple levels of interpretation, but 
getting all the details to work is an instructive exercise. 

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$ scheme --load ch5-compiler.scm

1 ]=> (load "5.50-compile-mceval.scm")

$ scheme --load ch5-regsim.scm 

1 ]=> (load "5.50-run-compiled-mceval.scm")
1 ]=> (set-register-contents! mceval-machine 'env (setup-environment))

1 ]=> (start mceval-machine)