GNU bug report logs - #4807
23.1.50; Unhelpful user visible type error in transpose-lines

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From: help-debbugs <at> gnu.org (Emacs bug Tracking System)
To: Geoff Gole <geoffgole <at> gmail.com>
Subject: bug#4807 closed by Juanma Barranquero <lekktu <at> gmail.com> (Re:
 bug#4807: 23.1.50; Unhelpful user visible type error in  transpose-lines)
Date: Mon, 26 Oct 2009 15:10:07 +0000

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

#4807: 23.1.50; Unhelpful user visible type error in transpose-lines

It has been closed by Juanma Barranquero <lekktu <at> gmail.com>.

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 Juanma Barranquero <lekktu <at> gmail.com> by
replying to this email.


-- 
4807: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=4807
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From: Juanma Barranquero <lekktu <at> gmail.com>
To: Geoff Gole <geoffgole <at> gmail.com>
Cc: 4807-done <at> debbugs.gnu.org
Subject: Re: bug#4807: 23.1.50; Unhelpful user visible type error in 
	transpose-lines
Date: Mon, 26 Oct 2009 15:59:39 +0100

On Mon, Oct 26, 2009 at 11:30, Geoff Gole <geoffgole <at> gmail.com> wrote:

> This isn't very helpful to the user. exchange-point-and-mark fails in
> the same conditions with the much clearer phrasing "No mark set in
> this buffer", perhaps transpose-lines should copy that.

Fixed, thanks.

    Juanma

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From: Geoff Gole <geoffgole <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 23.1.50; Unhelpful user visible type error in transpose-lines
Date: Mon, 26 Oct 2009 18:30:53 +0800

With an argument of 0, transpose-lines will swap the lines that point
and mark are in. In a fresh buffer in which mark has not yet been set
this will result in a type error:

   (wrong-type-argument integer-or-marker-p nil)

This isn't very helpful to the user. exchange-point-and-mark fails in
the same conditions with the much clearer phrasing "No mark set in
this buffer", perhaps transpose-lines should copy that.

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