((output
  (((f.ml (1 0) (1 25))
    (paragraph
     (((f.ml (1 0) (1 25))
       (reference (root foo unknown)
        (((f.ml (1 8) (1 24))
          (emphasis
           (((f.ml (1 11) (1 23))
             (emphasis (((f.ml (1 19) (1 22)) (word baz))))))))))))))))
 (warnings
  ( "File \"f.ml\", line 1, characters 11-23:\
   \n'{{!...} ...}' (cross-reference) is not allowed in '{{!...} ...}' (cross-reference).")))
