anchor.diff: -(in-package :parenscript)
  +(in-package "PARENSCRIPT")
   
   ;;; Script of library functions you can include with your own code to
   ;;; provide standard Lisp functionality.
  
positive.code:       (let ((result-array (make-array)))
          (if (= 1 (length as))
              (dolist (element (aref as 0))
                (result-array.push (fun element)))
              (dotimes (i (length (aref as 0)))
                (let ((args-array (mapcar (lambda (a) (return (aref a i))) as)))
                  (result-array.push (fun.apply fun args-array)))))
          (return result-array)))
  
      (defun map-into (fn arr)
  
negative.code:             (return true)))
        (return false))
  
      (defun set-difference (arr arr-to-sub)
        "Return a new array with only those elements in ARR that are not in ARR-TO-SUB."
        (let ((idx 0)
  