Paolo Bonzini <bonzini <at> gnu.org> writes:
>
>
> > In the meanwhile I thought about
> >
> > as_lineno=${as_lineno-$LINENO} func
> >
> > which is a slick trick, as it supports nesting and does not require
> > unset.
>
> ... and fails in bash 2.x, of course.
How? I built 2.05a just for this occasion, and I couldn't reproduce a failure.
$ func_var(){ var=$var${a-B}; }
$ func_var
$ a=b func_var
$ func_var
$ b=c
$ a=${a-$b} func_var
$ func_var
$ echo $var
BbBcB
$ echo $BASH_VERSION
2.05a.0(1)-release
--
Eric Blake
