5 Data and Control Flow   5.1 Generalized Reference   5.1.1 Overview of Places and Generalized Reference   5.1.1.1 Evaluation of Subforms to Places

5.1.1.1.1 Examples of Evaluation of Subforms to Places

 (let ((ref2 (list '())))
   (push (progn (princ "1") 'ref-1)
         (car (progn (princ "2") ref2)))) 
12
 (REF1)

 (let (x)
    (push (setq x (list 'a))
          (car (setq x (list 'b))))
     x)
 (((A) . B))

push first evaluates (setq x (list 'a))  (a), then evaluates (setq x (list 'b))  (b), then modifies the car of this latest value to be ((a) . b).