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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).