Re: memory management of all_visible_functions return

[Robert E. Griffith]

Well that worked out! I did not even realize they were connected but the 
bug I was just struggling with turned out to be that the variable my 
builtin was filling in was invisible so back in the bash script, 
"${!Array_vmt[@]}" was returning nothing even though there were elements.

So now the builtin does VUNSETATTR (vVMT, att_invisible); on all the 
variables it fills in and all is good:)

--BobG

On 4/21/22 10:06, Chet Ramey wrote:
> On 4/20/22 3:52 PM, Robert E. Griffith wrote:
> > > > `Invisible' variables are variables that have been assigned 
> > > > attributes but
> > > > not values, so they are technically unset.
> >
> > So what is the practical consequence of them not being visible?
>
> The variable shows as unset when referenced.
>
> Local variables have their own scoping issues that complicate things on
> occasion, but it's easy to see with something like this:
>
> myvar="hello"
> foo()
> {
>    local myvar
>    local b=isset
>
>    echo "${myvar-unset}"
>    echo "${b-unset}"
> }
> foo
>
> You'll get
>
> unset
> isset
>
> as output because `myvar' is unset.