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

Previous Next

Full log

View this message in rfc822 format

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: 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.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.