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ファイル更新の監視 (Nested Flatten)
再帰。
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(defun modify-checker (filename)
  (labels ((mtime () (sb-posix:stat-mtime (sb-posix:stat filename)))
           (check (old-t new-t)
             (when (/= old-t new-t)
               (format t "modified!~%"))
             (sleep 3)
             (check new-t (mtime))))
    (check (mtime) (mtime))))

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