RosettaCodeData/Task/Undefined-values/Common-Lisp/undefined-values-2.lisp

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Common Lisp
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2013-04-11 01:07:29 -07:00
(makunbound '*y*) ;; *y* no longer has a value; it is erroneous to evaluate *y*
(setf *y* 43) ;; *y* is bound again.