((output
  (((f.ml (1 0) (3 4))
    (paragraph (((f.ml (1 0) (3 4)) (code_span  "foo\
                                               \nbar")))))))
 (warnings
  ( "File \"f.ml\", line 1, character 4 to line 3, character 0:\
   \nBlank line is not allowed in '[...]' (code).")))
