((output
  (((f.ml (1 0) (3 4))
    (paragraph
     (((f.ml (1 0) (3 4))
       (bold
        (((f.ml (1 3) (1 6)) (word foo)) ((f.ml (2 0) (2 0)) space)
         ((f.ml (3 0) (3 3)) (word bar))))))))))
 (warnings
  ( "File \"f.ml\", line 2, characters 0-0:\
   \nBlank line is not allowed in '{b ...}' (boldface text).")))
