bug#64391: buffer narrowing slowdown regression in emacs 29

[Gregory Heytings]

> > but somehow I think it's not TRT and there's a more idiomatic way to do 
> > that.
>
> Yes: don't do it, or do it via a runtime check rather than a 
> compile-time check.  But here I don't see any benefit to imposing that 
> LABEL evaluates to a symbol.

Agreed.

I guess this bug can be closed for good now?