Drew Adams <drew.adams@oracle.com> schrieb am Di., 26. Sep. 2017 um
04:53 Uhr:

>
> Uh, let-binding dynamic variables is as old as the hills.
> It's older than Emacs (and that's saying something).
> <https://www.gnu.org/software/emacs/emacs-paper.html#SEC15>


It's still no good. Dynamic variables are global mutable state, with all
its downsides.
Early Lisps had only dynamic binding because people didn't know better. But
now we know that global mutable state is almost always undesirable and
avoid id wherever we can.