Submission instructions:

Submit the solution to the first exercise
in a single .ss file. 

Submit the solutions to the remaining exercises
in a single text file.

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1. Solve Exercise 14.3.2 in the textbook.

You can use this interpreter as the basis of your solution:
http://www.daimi.au.dk/~ko/teaching/pl/plt9.ss

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2. Assemble two lists of reasons why mutable 
state as discussed in the lecture from 27/2/09
is or isn't, respectively, a desirable programming
language feature. Avoid subjective judgements ("nice",
"handy", "difficult") and be as precise as possible.

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3. Consider the presentation on "Functional Objects"
from Michael Felleisen, which is available here:
http://www.ccs.neu.edu/home/matthias/Presentations/ecoop2004.pdf

Discuss the programming style described on the first twenty
slides of the talk.