GNU bug report logs - #26635
25.1; elisp docs bug

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#26635: closed (25.1; elisp docs bug)
Date: Mon, 24 Apr 2017 10:51:01 +0000

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Your message dated Mon, 24 Apr 2017 12:50:20 +0200
with message-id <87h91edqqb.fsf <at> linux-m68k.org>
and subject line Re: 回复： bug#26635: 25.1; elisp docs bug
has caused the debbugs.gnu.org bug report #26635,
regarding 25.1; elisp docs bug
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: "zhangjg" <jinguozhang <at> qq.com>
To: "bug-gnu-emacs" <bug-gnu-emacs <at> gnu.org>
Subject: 25.1; elisp docs bug
Date: Mon, 24 Apr 2017 11:35:55 +0800

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The elisp docs in the session "12.1 What Is a Function?" distinction the funtion and the function-like object.
But in some pages, some function-like object is give as a function. 
For example:
In session "3.4 Comparison of Numbers", "=" is a set to a "function" but, in fact it a "special forms".

In the same resason, I think, "<", "<=", ">", ">=" also should be "special forms".

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From: Andreas Schwab <schwab <at> linux-m68k.org>
To: "zhangjg" <jinguozhang <at> qq.com>
Cc: 26635 <26635-done <at> debbugs.gnu.org>
Subject: Re: 回复： bug#26635: 25.1; elisp docs bug
Date: Mon, 24 Apr 2017 12:50:20 +0200

On Apr 24 2017, "zhangjg" <jinguozhang <at> qq.com> wrote:

> Like the fellow code:
>
>   (= 1 1 t) ; error
>   (= 1 2 t) ; nil
>
> t is a symbol, (= 1 1 t) signal a error, that is what we expect. 
> But in the second form there is no error, because  "=" get the
> result before to eval the third argument "t". 

All arguments are evaluated, by the caller.  Try (= 1 2 (foo)), for
example.

> So "=" not to eval all arguments, that is  a "sepecial form" activation.

It may _ignore_ some of its arguments, but that's not what `special
form' is about.  Any function is free to ignore arguments.

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
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