Re: Default lexical-binding to t

[Andrea Corallo <acorallo@gnu.org>]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> In bug#74145 I suggest that it is time to change the default of
> `lexical-binding` to t.  Clearly this is a breaking change, but only for
> those files which:
>
> - Don't have a `lexical-binding` cookie.
> - Have code which happens to behave differently under the new dialect
>   (such code is not rare, but a lot of code works identically in the
>   two dialects).
>
> I believe by the time Emacs-31 will be released, such files will be
> uncommon, and it is easy to fix them (either by adjusting he code, or
> by slapping a `lexical-binding` cookie).

I support this, together with the idea of having a warning when loading
file without the cookie.  We can always remove the warning (and the
cookies) in the future when/if we feel it's time.

  Andrea