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4 points by drcode 5692 days ago | link | parent

Your definition has a typo, I think- What you probably meant is:

  (mac focus (var . body)
    (w/uniq (storage unbound)
      `(withs (,storage nil
               ,var (fn ((o arg ',unbound))
                      (if (is arg ',unbound)
                          ,storage
                          (= ,storage arg))))
         ,@body  
         ,storage)))