((output
  (((f.ml (1 0) (1 6)) (paragraph (((f.ml (1 0) (1 6)) (code_span " foo")))))))
 (warnings
  ( "File \"f.ml\", line 1, characters 0-6:\
   \n'{ foo}': bad markup.\
   \nSuggestion: did you mean '{! foo}' or '[ foo]'?")))
