Exercise 3.36 · 习题

Exercise 3.36: Suppose we evaluate the following
sequence of expressions in the global environment:

(define a (make-connector))
(define b (make-connector))
(set-value! a 10 'user)

At some time during evaluation of the set-value!, the following
expression from the connector’s local procedure is evaluated:

(for-each-except
setter inform-about-value constraints)

Draw an environment diagram showing the environment in which the above

expression is evaluated.

练习 3.36：假设我们在全局环境中依次求值如下表达式：

(define a (make-connector))
(define b (make-connector))
(set-value! a 10 'user)

在 set-value! 的求值过程中的某个时刻，连接器的局部过程中求值了如下表达式：

(for-each-except
setter inform-about-value constraints)

请画出环境图，展示上述表达式所在的求值环境。