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

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From: help-debbugs <at> gnu.org (Emacs bug Tracking System)
To: Alan Mackenzie <acm <at> muc.de>
Subject: bug#2723 closed by Stefan Monnier <monnier <at> iro.umontreal.ca> (Re:
 bug#2723: Emacs 23: `interactive': prefix argument "P" and region "r" are 
 mutually exclusive.)
Date: Thu, 19 Mar 2009 20:45:04 +0000

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This is an automatic notification regarding your bug report
which was filed against the emacs package:

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

It has been closed by Stefan Monnier <monnier <at> iro.umontreal.ca>.

Their explanation is attached below along with your original report.
If this explanation is unsatisfactory and you have not received a
better one in a separate message then please contact Stefan Monnier <monnier <at> iro.umontreal.ca> by
replying to this email.


-- 
2723: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=2723
Emacs Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Alan Mackenzie <acm <at> muc.de>
Cc: 2723-done <at> debbugs.gnu.org
Subject: Re: bug#2723: Emacs 23: `interactive': prefix argument "P" and region "r" are mutually exclusive.
Date: Thu, 19 Mar 2009 16:40:11 -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")


        Stefan

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From: Alan Mackenzie <acm <at> muc.de>
To: bug-gnu-emacs <at> gnu.org
Subject: Emacs 23: `interactive': prefix argument "P" and region "r" are
	mutually exclusive.
Date: Thu, 19 Mar 2009 19:15:24 +0000

Hi, Emacs!

In the following:

#########################################################################
(defun echo-prefix (arg)
  "Echo the command prefix"
  (interactive "P")
  (message "Command prefix: %s" arg))

(defun echo-region (beg end)
  "Echo the region boundaries"
  (interactive "r")
  (message "Region: (%s %s)" beg end))

(defun echo-region-prefix (beg end arg)
  "Echo the region and prefix parameters."
  (interactive "rP")
  (message "region: (%s %s); prefix: %s" beg end arg))
#########################################################################

, echo-prefix and echo-region work as expected.  echo-region-prefix
throws this error:

    Wrong number of arguments: (lambda (beg end arg) "Echo the region and
    prefix parameters." (interactive "rP") (message "region: (%s %s);
    prefix: %s" beg end arg)), 2

It seems that `(interactive "rP")' is only supplying the defun with two
parameters.

-- 
Alan Mackenzie (Nuremberg, Germany).

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