((output
  (((f.ml (1 0) (1 14))
    (paragraph
     (((f.ml (1 0) (1 14))
       (bold
        (((f.ml (1 3) (1 6)) (word foo))
         ((f.ml (1 6) (1 13)) (bold (((f.ml (1 9) (1 12)) (word bar)))))))))))))
 (warnings ()))
