On Sat, Jan 28, 2023 at 09:11:41AM -0700, abq@bitrot.link wrote:
> tomas wrote:
> > I think it's backward compatibility, mainly. Files with no explicit
> > lexical binding setting (may) contain code which expects dynamic
> > binding and would break.
> 
> As I mentioned, the global value of lexical-binding defaults to nil.

Yes, you did mention that.

>                                                                     This is
> the case in Emacs 24 through 28, and obviously will be in 29 too. Therefore,
> even if the global value were honored in 29 and future versions, files with
> no explicit setting would continue to get dynamic binding, as they expect.
> They won't break.
> 
> In order to break anything, you would have to do so explicitly, via
> (setq-default lexical-binding t).

The docs only talk about a buffer-local variable, so I'd guess that the
global variable of the same name is simply ignored.

Cheers
-- 
t