((output
  (((f.ml (1 0) (1 6))
    (paragraph (((f.ml (1 0) (1 6)) (reference (root foo unknown) ())))))))
 (warnings
  ( "File \"f.ml\", line 1, characters 6-6:\
   \nEnd of text is not allowed in '{{!...} ...}' (cross-reference)."
    "File \"f.ml\", line 1, characters 6-6:\
   \nEnd of text is not allowed in '{{!...} ...}' (cross-reference)."
    "File \"f.ml\", line 1, characters 0-6:\
   \n'{{!...} ...}' (cross-reference) should not be empty.")))
