((output
  (((f.ml (1 0) (1 7))
    (paragraph (((f.ml (1 0) (1 7)) (code_span "  foo")))))))
 (warnings
  ( "File \"f.ml\", line 1, characters 0-7:\
   \n'{  foo}': bad markup.\
   \nSuggestion: did you mean '{!  foo}' or '[  foo]'?")))
