nounset and $! behavior

From	Grisha Levit <grishalevit@gmail.com>
Newsgroups	gnu.bash.bug
Subject	nounset and $! behavior
Date	2018-11-12 18:55 -0500
Message-ID	<mailman.3953.1542067706.1284.bug-bash@gnu.org> (permalink)

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The following crashes bash:

bash-5.0$ set -u
bash-5.0$ echo ${!,}
bash: $!: unbound variable
bash: !: unbound variable
bash-5.0$ echo ${!,}
bash: $!: unbound variable

Testing if $! is set also doesn't seem to be possible:

bash-5.0$ echo ${!-}
bash: $!: unbound variable

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nounset and $! behavior Grisha Levit <grishalevit@gmail.com> - 2018-11-12 18:55 -0500

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