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amstdam.lst

Associated article: Adding Extensions to Lisp

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					_Adding Extensions to Lisp_ 
by Jonathan Amsterdam


Listing 1.

(defmacro for (var-from-to &rest body)
  (let ((var (first var-from-to))
	(from (second var-from-to))
	(to (third var-from-to)))
    `(prog (,var)
	   (setq ,var ,from)
	 loop
	   (cond ((> ,var ,to) (go end)))
	   ,@body
	   (setq ,var (+ ,var 1))
	   (...
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