Created
July 18, 2019 00:13
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| (defun box (thing) (cons :box thing)) | |
| (defun ref (box) | |
| (assert (eq (car box) :box)) | |
| (cdr box)) | |
| (defun (setf ref) (value box) | |
| (assert (eq (car box) :box)) | |
| (setf (cdr box) value)) |
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