GNU bug report logs - #52063
28.0.60; Confusing presentation of lambda

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Message #32 received at 52063 <at> debbugs.gnu.org (full text, mbox):

From: Filipp Gunbin <fgunbin <at> fastmail.fm>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Lars Ingebrigtsen <larsi <at> gnus.org>, 52063 <at> debbugs.gnu.org,
 monnier <at> iro.umontreal.ca
Subject: Re: bug#52063: 28.0.60; Confusing presentation of lambda
Date: Wed, 24 Nov 2021 19:40:16 +0300

On 24/11/2021 16:38 +0200, Eli Zaretskii wrote:

>> From: Lars Ingebrigtsen <larsi <at> gnus.org>
>> Cc: 52063 <at> debbugs.gnu.org,  monnier <at> iro.umontreal.ca
>> Date: Wed, 24 Nov 2021 14:31:22 +0100
>>
>> If you put
>>
>> (lambda () 1)
>>
>> into *scratch* and then `C-u C-x C-e' it'll spit put
>>
>> (closure (t) nil 1)
>>
>> Because that's what that form evaluates to in lexically bound buffers.
>> `lambda' is no longer self-evaluating, and hasn't been for a few years.
>>
>> (But I guess it's pretty recent that *scratch* defaults to lexical.)
>>
>> And it's the same with
>>
>> (lambda ()
>>   (setq flyspell-generic-check-word-p
>> 	'mail-mode-flyspell-verify))
>>
>> of course.
>
> I'm asking why we are doing this.  IT IS CONFUSING!!!

But you're creating normal lambda here, and under lex-bind it will
become a closure, to keep its lexical environment together with it.  In
your case there's nothing in lex environment, so that's it.

I just realized that I don't have lex-binding turned on in .emacs, and
because of that my customized hooks look "good", but I wonder: what is
the recommended binding mode for .emacs?  Dynamic or lexical?  With
lexical, all customizations would start to look as your example.

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