((output
  (((f.ml (1 0) (1 6))
    (paragraph
     (((f.ml (1 0) (1 6)) (bold (((f.ml (1 2) (1 5)) (word foo))))))))))
 (warnings
  ( "File \"f.ml\", line 1, characters 0-2:\
   \n'{b' should be followed by space, a tab, or a new line.")))
