((output
  (((f.ml (1 0) (3 4))
    (2
     (label
      ((root (f.ml (page f.ml) 00000000000000000000000000000000) f.ml)
       (label foo)))
     (((f.ml (3 0) (3 3)) (word Foo)))))))
 (warnings
  ( "File \"f.ml\", line 2, characters 0-0:\
   \nBlank line is not allowed in '{2 ...}' (section heading).")))
