GNU bug report logs - #26221
(defun function nil should work in 2.2

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Jean Louis <bugs <at> gnu.support>
To: bug-guile <at> gnu.org
Subject: (defun function nil should work in 2.2
Date: Thu, 23 Mar 2017 00:48:53 +0300

In my opinion, (defun hello nil (print "Hello")) should work in
Guile-2.2 but it does not.

If it works in Emacs it should work in Guile with the option
--language=elisp

Jean

Message #8 received at 26221 <at> debbugs.gnu.org (full text, mbox):

From: Joshua Branson <bransoj <at> hotmail.com>
To: "26221 <at> debbugs.gnu.org" <26221 <at> debbugs.gnu.org>
Subject: (define function nil should work in 2.2
Date: Thu, 23 Mar 2017 19:59:04 +0000

I can confirm this bug.  Eshell accepts (defun hello nil (print “Hello"))  And (hello)  works properly.

M-x guiler

,languages elisp

(defun hello nil (print “Hello”))  doesn’t work.

Joshua

P.S.  I didn’t even know (define function nil …) was a thing in elisp land.

Message #11 received at submit <at> debbugs.gnu.org (full text, mbox):

From: <tomas <at> tuxteam.de>
To: bug-guile <at> gnu.org
Subject: Re: bug#26221: (define function nil should work in 2.2
Date: Fri, 24 Mar 2017 10:19:25 +0100

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On Thu, Mar 23, 2017 at 07:59:04PM +0000, Joshua Branson wrote:
> 
> I can confirm this bug.  Eshell accepts (defun hello nil (print “Hello"))  And (hello)  works properly.
> 
> M-x guiler
> 
> ,languages elisp
> 
> (defun hello nil (print “Hello”))  doesn’t work.
> 
> Joshua
> 
> P.S.  I didn’t even know (define function nil …) was a thing in elisp land.

No, no. It's not (defun nil) -- it's (defun foo nil ...), which, if you squint a
bit is the same (in Lisp!) as (defun foo () ...) -- defining function foo with
an empty argument list. This is a perfectly respectable thing to do.

That's because, for Lisp, nil, '() and false are all one and the same. Scheme
is pickier here, and I'd imagine that this is the reflection of one of those
translation pains. But I don't know enough about Guile's elisp implementation
to be sure (ah, I wish I had the time for that...)

regards
- -- tomás
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Message #16 received at 26221-done <at> debbugs.gnu.org (full text, mbox):

From: Taylan Kammer <taylan.kammer <at> gmail.com>
To: 26221-done <at> debbugs.gnu.org
Subject: (defun function nil ...) should work in 2.2
Date: Wed, 19 May 2021 13:52:25 +0200

Closing as it works in 3.0.

-- 
Taylan

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