((output
  (((f.ml (1 0) (1 9))
    (paragraph
     (((f.ml (1 0) (1 9)) (link "" (((f.ml (1 5) (1 8)) (word foo))))))))))
 (warnings
  ( "File \"f.ml\", line 1, characters 0-4:\
   \n'{{:...} ...}' (external link) should not be empty.")))
