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bug#24780: 26.0.50; describe-mode lexical-binding

From: Stefan Kangas
Subject: bug#24780: 26.0.50; describe-mode lexical-binding
Date: Tue, 11 Aug 2020 18:06:39 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Alan Mackenzie <acm@muc.de> writes:

>> Andreas Röhler <andreas.roehler@easy-emacs.de> writes:
>>> consider it useful if `describe-mode' reports value of var
>>> `lexical-binding'.
>>> Even displaying it in mode-line might be an option.
>> That does sound more useful -- I often find jumping back to the start of
>> the buffer to check.
>> `emacs-lisp-mode' could display that somewhere in the mode line, I
>> guess?  But where?  Perhaps among the U:**- thing at the start?  Or in
>> the mode stuff?
>> So instead of
>> (Emacs-Lisp)
>> we'd get
>> (Emacs-Lisp Lexical)
>> when we have lexical binding in the current buffer?  Does anybody have
>> an opinion here?
> Yes.  "Lexical" is too long, considering its relative lack of
> importance.  Space on the mode line is precious, particularly when
> running Follow Mode.  Also, "Lexical" isn't really a minor mode, so
> shouldn't look like one.
> How about, instead,
>     (Emacs-Lisp/L)
> or
>     (Emacs-Lisp/D)

How about:




This would indicate the legacy nature of dynamic binding, and gently
nudge users to move to lexical-binding.

> ?  Even that is going to be a nuisance to some people, so it really
> needs a user option to turn it off.

I wouldn't add a user option.  The correct way to get rid of the "/D",
if it bothers you, would then be to convert the code to

Best regards,
Stefan Kangas

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