Re: 5.2.15(1)-release: RETURN trap not executed in cmd subst if last statement of fct is not builtin

[Chet Ramey]

On 7/6/24 7:41 AM, Jens Schmidt wrote:
> Today I came across this one:
>
>    [copy-on-select-2]$ echo $BASH_VERSION
>    5.2.15(1)-release
>    [copy-on-select-2]$ foo() { trap 'echo foo' RETURN; /bin/echo bar; }
>    [copy-on-select-2]$ foo
>    bar
>    foo
>    [copy-on-select-2]$ baz=$( foo )
>    [copy-on-select-2]$ echo "<$baz>"
>    <bar>
>
> I guess that Bash execve's the "/bin/echo" since it runs in a command
> substitution and the trap does not get executed, hence.

Thanks for the report. The issue is aggressive fork optimization, as you
suspected.

Chet

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/

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