From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bastien Guerry <bzg@gnu.org>
Subject: Re: Add ob-sclang.el for sclang Org-mode babel support in contrib/
Date: Sun, 18 Jun 2017 21:45:25 +0200
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To: Nicolas Goaziou <mail@nicolasgoaziou.fr>
Cc: Org-mode <emacs-orgmode@gnu.org>

Hi Nicolas,

Nicolas Goaziou <mail@nicolasgoaziou.fr> writes:

> Bastien Guerry <bzg@gnu.org> writes:
>
>> Still: when it is not used, why adding it?
>
> We are not adding it since it is in the file by default; you removed
> it :)

I guess it is in the file by default because the odds are good that
lexical scoping will be actually used.

> This is an odd question, however. The thing is: how is Emacs-lisp
> scoping, dynamic or lexical? We ought not consider it to be both
> throughout the code base (even though one file still uses dynamic
> scoping) as it is just confusing for developers. Since lexical scoping
> prevents a whole class of (vicious) bugs, it is the most common type of
> scoping among modern languages, by large. As of Emacs 24.1, let's just
> consider Elisp to be lexically scoped.

I agree it's good to have lexical scoping, but I don't consider Elisp
to be lexical scopped -- I consider Elisp to let the user pick up the
constraints he wants, with dynamic binding still being the default.

> In a nutshell, "-*- lexical-binding:t ; -*-" ought to be a mandatory
> cookie in every Elisp file.

Maybe lexical binding will be the default behavior one day, but in the
meantime, I would suggest to use "-*- lexical-binding:t ; -*-" only if
lexical binding is actually used in the file.

Best,

-- 
 Bastien