From: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 62746-done@debbugs.gnu.org, one.last.kiss@outlook.com
Subject: bug#62746: [PATCH] Updated Elispref-Manual: `nil' cannot be defuned
Date: Fri, 05 May 2023 10:01:24 -0400 [thread overview]
Message-ID: <jwvfs8aubdf.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <834jorjnas.fsf@gnu.org> (Eli Zaretskii's message of "Fri, 05 May 2023 09:38:03 +0300")
>> >> “The symbols nil and void are Lisp objects, and can be stored into a
>> >> function cell just as any other object can be (and they can be valid
>> >> functions if you define them in turn with defun).”
>> >>
>> >> Updated:
>> >>
>> >> “The symbols nil and void are Lisp objects, and can be stored into a
>> >> function cell just as any other object can be (and void can be a
>> >> valid function if you define it with defun).”
>> >
>> > Why do you think the original text needs to be corrected?
>>
>> Indeed, `nil` is treated specially to mean "not defined" when we try to
>> call a function:
>>
>> Lisp_Object
>> funcall_general (Lisp_Object fun, ptrdiff_t numargs, Lisp_Object *args)
>> {
>> Lisp_Object original_fun = fun;
>> retry:
>> if (SYMBOLP (fun) && !NILP (fun)
>> && (fun = XSYMBOL (fun)->u.s.function, SYMBOLP (fun)))
>> fun = indirect_function (fun);
>>
>> if (SUBRP (fun) && !SUBR_NATIVE_COMPILED_DYNP (fun))
>> return funcall_subr (XSUBR (fun), numargs, args);
>> else if (COMPILEDP (fun)
>> || SUBR_NATIVE_COMPILED_DYNP (fun)
>> || MODULE_FUNCTIONP (fun))
>> return funcall_lambda (fun, numargs, args);
>> else
>> {
>> if (NILP (fun))
>> xsignal1 (Qvoid_function, original_fun);
>>
>
> Thanks. So I think our documentation is correct in this aspect, and
> I'm therefore closing this bug.
The current text suggest that `nil` "can be valid [a]
function if you define [it] in turn with defun", which is not really true.
Stefan
next prev parent reply other threads:[~2023-05-05 14:01 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-10 8:33 bug#62746: [PATCH] Updated Elispref-Manual: `nil' cannot be defuned Shynur Xie
2023-04-10 8:50 ` Eli Zaretskii
2023-04-10 8:56 ` Shynur Xie
2023-04-10 9:02 ` Eli Zaretskii
2023-04-10 9:11 ` Shynur Xie
2023-04-10 14:14 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-05-05 6:38 ` Eli Zaretskii
2023-05-05 14:01 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors [this message]
2023-05-05 14:06 ` Eli Zaretskii
2023-05-05 18:04 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-05-06 9:49 ` Eli Zaretskii
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