프로시저는 앞서 일어난 일을 기억할 수 있다.

(let ((balance 100))
  (let ((withdraw
         (lambda (amount)
           (if (>= balance amount)
               (begin
                 (set! balance (- balance amount))
                 balance)
               'insufficient-funds))))
    (let ((first (withdraw 25)))
      (let ((second (withdraw 25)))
        (let ((third (withdraw 60)))
          (list first second third))))))