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nounset and $! behavior

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

#14806 — nounset and $! behavior

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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