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From: Ulrich Neumerkel <ulrich@a0.complang.tuwien.ac.at>
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Subject: undocumented change in mapconcat
Date: Thu, 21 Mar 2002 14:02:47 +0100 (MET)
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--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

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