Thanks Matthias. I should have read the error message more carefully.
For anyone who is interested, it has nothing to do with cons or mcons or
quotes. There was a mistake in interpreter.rkt.
If you'd like to try finding it yourself, then stop reading.
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Here's the fix. In interpreter.rkt, under the definition of myeval, in the case
of a let expression, it should have been:
[(eq? (car expr) 'let)
(eval-sequence (cddr expr)
(extend-env
(map first (second expr))
(eval-args (map second (second expr)) env)
env))]
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