Subject: bug#2723: Emacs 23: `interactive': prefix argument "P" and region "r" are mutually exclusive.

From: Stefan Monnier <[email-masked]>
Date: Fri, 20 Mar 2009 09:19:51 -0400

>> > It seems that `(interactive "rP")' is only supplying the defun with two
>> > parameters.
>> Read C-h f interactive RET, and if you read carefully enough you'll see
>> you need (interactive "r\nP")
> No.

I see two bugs:
1 - the doc is unclear about the need for a newline.
2 - arguments without prompts should signal a warning when provided with
    a prompt (this would have helped you find your problem).

        Stefan