((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'{%...%}' (raw markup) needs a target language.\
   \nSuggestion: try '{%html:...%}'.")))
