((output
  (((f.ml (1 0) (1 2))
    (2
     (label
      ((root (f.ml (page f.ml) 00000000000000000000000000000000) f.ml)
       (label "")))
     ()))
   ((f.ml (1 3) (1 15)) (@author Foo}))))
 (warnings
  ( "File \"f.ml\", line 1, characters 3-15:\
   \n'@author' is not allowed in '{2 ...}' (section heading)."
    "File \"f.ml\", line 1, characters 0-2:\
   \n'{2 ...}' (section heading) should not be empty."
    "File \"f.ml\", line 1, characters 3-15:\
   \n'@author' should begin on its own line.")))
