Re: undocumented change in mapconcat

[David Kastrup]

ulrich@a0.complang.tuwien.ac.at (Ulrich Neumerkel) writes:

> --text follows this line--
> 
> In GNU Emacs 21.1.2 (i686-pc-linux-gnu, X toolkit)
>  of 2002-03-15 on a8.complang.tuwien.ac.at
> configured using `configure  --prefix /usr/local
>  --without-toolkit-scroll-bars'
> 
> Please describe exactly what actions triggered the bug
> and the precise symptoms of the bug:
> 
> in 20.7.2 (mapconcat 'identity '(1 10) ", ") yielded "1, 10"
> but in 21.1.2 this gives an error

This is not an undocumented change in mapconcat, but rather a
documented change in concat.  See the NEWS file:
** Code that uses `concat' with integer args now gets an error, as
long promised.

The solution, of course, is to use
(mapconcat 'int-to-string '(1 10) ", ")

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum
Email: David.Kastrup@t-online.de