Re: parsing command substitution inside parameter expansion in interactive shell

[Grisha Levit]

On Mon, Mar 20, 2023 at 4:59 PM Chet Ramey <chet.ramey@case.edu> wrote:
> Thanks for the report. This is the same thing as
>
> https://lists.gnu.org/archive/html/bug-bash/2021-06/msg00115.html
>
> with the command substitution being embedded in the parameter expansion.

One more similar case when the parameter expansion is quoted:

bash --norc -in <<<$'"${_+$("\n")}"'
bash-5.2$ "${_+$("
bash: command substitution: line 2: unexpected EOF while looking for
matching `"'
> ")}"

bash --norc -in <<<$'"${_+$(:\n)}"'
bash-5.2$ "${_+$(:
bash: command substitution: line 3: unexpected EOF while looking for
matching `)'
> )}"