Sorry for this question, but I don't understand why I get this message for this
small programme :

------- Programme
(*
 * Reverse a file by line
 *)

let rec rev_write str_buf str_len str_pos = match str_buf.[str_pos] with
  | '\n' -> output stdout str_buf (str_pos + 1) (str_len - str_pos);
    rev_write str_buf str_len (str_pos - 1);
  | _ -> rev_write str_buf str_len (str_pos - 1);;

let main =
  let chan_len = in_channel_length stdin in
  let str_buf = String.create (chan_len + 1) in
  let junk = input stdin str_buf 1 chan_len in
  str_buf.[0] <- '\n';
  rev_write str_buf chan_len chan_len;;
------- Message

File "reverse_line_file.ml", line 11, characters 2-199:
The type of this expression, '_a,
contains type variables that cannot be generalized

-------

I don't understand either the 'characters 2-199' message.

NOTE: commenting the call to 'rev_write' in 'main' make this message disappear
(but it does nothing of course ...).

Thanx,

Antoine
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