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From: Martin Schulte <gnu@schrader-schulte.de>
Newsgroups: gnu.bash.bug
Subject: Backslash missing in brace expansion
Date: Thu, 5 Dec 2019 20:11:57 +0100
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Xref: csiph.com gnu.bash.bug:15695

Hello,

please have a look:

$ uname -a
Linux martnix4 4.9.0-11-amd64 #1 SMP Debian 4.9.189-3+deb9u2 (2019-11-11)
x86_64 GNU/Linux $ echo ${BASH_VERSINFO[@]}
4 4 12 1 release x86_64-pc-linux-gnu
$ set -x
$ echo {Z..a}
+ echo Z '[' '' ']' '^' _ '`' a
Z [  ] ^ _ ` a

It looks as if the backslash (between [ and ] in ASCII code) is missing in
brace expansion. The same behaviour seems to be found in bash 5.0.

Best regards,

Martin