((output
  (((f.ml (1 0) (1 8)) (paragraph (((f.ml (1 0) (1 8)) (code_span foo)))))))
 (warnings
  ( "File \"f.ml\", line 1, characters 0-8:\
   \n'{%:': bad raw markup target.\
   \nSuggestion: try '{%html:...%}'.")))