3.3.1. Mutable List Structure
Exercise 3.20

Draw environment diagrams

Draw environment diagrams to illustrate the evaluation of the sequence of expressions

(define x (cons 1 2))
(define z (cons x x))
(set-car! (cdr z) 17)
(car x)
17

using the procedural implementation of pairs given above. (Compare exercise 3.11.)


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