[Bug 295086] /bin/sh undefined variable in heredoc triggers assertion

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295086

Jilles Tjoelker <jilles@FreeBSD.org> changed:

           What    |Removed                     |Added
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             Status|New                         |Open

--- Comment #1 from Jilles Tjoelker <jilles@FreeBSD.org> ---
This seems like a valid bug, thanks for the report.

Experimenting with crashing and working commands refines the issue a little:

* Other expansion errors such as ${some_unset_variable?} or $((1/0)) also
result in a crash.
* The command substitution must contain a single simple command for a crash to
occur.
* The non-POSIX $(cat << eol) with the heredoc body outside the parentheses is
not relevant: the issue also happens with things like

thing=$(cat <<eol
$((1/0))
eol
)

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