M-x foo と C-u M-x foo を区別したいような場合で、引数の値自体はどうでもいい場合。
(interactive "P") を指定し、引数が nil かどうかをチェックすればよい。
(defun foo (arg)
(interactive "P")
(if arg
"引数が指定された"
"引数が指定されなかった"))
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