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Allegro CL |
ANSI Common Lisp  5 Data and Control Flow 5.1 Generalized Reference 5.1.2 Kinds of Places
5.1.2.4 THE Forms as PlacesA the form can be used as a place, in which case the declaration is transferred to the newvalue form, and the resulting setf is analyzed. For example,
(setf (the integer (cadr x)) (+ y 3))is processed as if it were
(setf (cadr x) (the integer (+ y 3)))
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