Re: V+=1 doesn't work if V is a reference to an integer array element

[Chet Ramey]

On 1/13/21 1:11 PM, Léa Gris wrote:

> echo $BASH_VERSION
> > 5.0.17(1)-release
>
> unset a b
> declare -ai a=(1)
> declare -in b="a[0]"

The `-i' forces arithmetic evaluation, which makes this expand to the 
equivalent of `declare -n b=1'. That's an invalid name for a nameref,
which you'd see if you used `declare -n b=1' instead. The assignment
error causes `declare' to return an non-zero status, but the error
message checks the original value, not the result of arithmetic
evaluation, and the `a[0]' is valid.

I guess I never thought people would try to use integer variables as
namerefs, since nameref values can't be digits.

--
``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/