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From: Chris Down <chris@chrisdown.name>
Newsgroups: gnu.bash.bug
Subject: Re: Exclamation mark does not work with set -e
Date: Mon, 6 Apr 2020 15:50:53 +0100
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Approved: bug-bash@gnu.org
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Xref: csiph.com gnu.bash.bug:16103

fb@florentbordignon.fr writes:
>The following assertion succeeds when it should not :
>set -e
>! true
>echo Hello # prints Hello but should not

Please do read the documentation before reporting bugs :-)

If you read the documentation for `-e`, you'll see that if the command is being 
inverted with `!`, `set -e` does not apply.