Re: 5.3-alpha: value substitutions remove unrelated REPLY when its REPLY is removed

[Chet Ramey]

On 4/27/24 5:43 PM, Koichi Murase wrote:
> When REPLY that is prepared by a value substitution ${ <list>; } is
> removed by <list>, the value substitution removes the previous-scope
> REPLY, which is not prepared by the value substitution, after the
> execution of <list>.
>
> $ bash-5.3-alpha --norc
> $ unlocal() { unset -v "$@"; }
> $ f2() { unlocal "$1"; echo "f2:$1=${!1}"; }
> $ f1() { local REPLY=1; a=${| f2 REPLY; }; echo "f1:REPLY=$REPLY"; }
> $ f1
> f2:REPLY=1
> f1:REPLY=
>
> Removing REPLY inside a value substitution is admittedly arguable.
> Nevertheless, it is still more consistent for value substitutions to
> remove only the REPLY they prepared, if present, and to avoid removing
> unrelated REPLY.

Thanks for the report. I agree that valsubs should only unset an instance
of REPLY at the current function context.

--
``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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