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

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Package: emacs;

Reported by: Geoff Gole <geoffgole <at> gmail.com>

Date: Mon, 26 Oct 2009 10:35:04 UTC

Severity: normal

Done: Juanma Barranquero <lekktu <at> gmail.com>

Bug is archived. No further changes may be made.

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From: Geoff Gole <geoffgole <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: bug#4807: 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.
This bug report was last modified 15 years and 272 days ago.

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