((output
  (((f.ml (1 0) (1 15))
    (paragraph
     (((f.ml (1 0) (1 15))
       (reference (root foo unknown) (((f.ml (1 8) (1 14)) (emphasis ()))))))))))
 (warnings
  ( "File \"f.ml\", line 1, characters 8-14:\
   \n'{!...}' (cross-reference) is not allowed in '{{!...} ...}' (cross-reference).")))
