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.