GNU bug report logs -
#26635
25.1; elisp docs bug
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Reported by: "zhangjg" <jinguozhang <at> qq.com>
Date: Mon, 24 Apr 2017 03:37:01 UTC
Severity: minor
Found in version 25.1
Done: Andreas Schwab <schwab <at> linux-m68k.org>
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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
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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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Message #8 received at 26635 <at> debbugs.gnu.org (full text, mbox):
On Apr 24 2017, "zhangjg" <jinguozhang <at> qq.com> wrote:
> In session "3.4 Comparison of Numbers", "=" is a set to a "function" but, in fact it a "special forms".
Why do you think `=' is a special form?
Andreas.
--
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
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Message #11 received at 26635 <at> debbugs.gnu.org (full text, mbox):
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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".
So "=" not to eval all arguments, that is a "sepecial form" activation.
------------------ 原始邮件 ------------------
发件人: "Andreas Schwab";<schwab <at> linux-m68k.org>;
发送时间: 2017年4月24日(星期一) 下午5:59
收件人: "zhangjg"<jinguozhang <at> qq.com>;
抄送: "26635"<26635 <at> debbugs.gnu.org>;
主题: Re: bug#26635: 25.1; elisp docs bug
On Apr 24 2017, "zhangjg" <jinguozhang <at> qq.com> wrote:
> In session "3.4 Comparison of Numbers", "=" is a set to a "function" but, in fact it a "special forms".
Why do you think `=' is a special form?
Andreas.
--
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
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Andreas Schwab <schwab <at> linux-m68k.org>:
You have taken responsibility.
(Mon, 24 Apr 2017 10:51:01 GMT)
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bug acknowledged by developer.
(Mon, 24 Apr 2017 10:51:01 GMT)
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Message #16 received at 26635-done <at> debbugs.gnu.org (full text, mbox):
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
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
bug archived.
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(Mon, 22 May 2017 11:24:04 GMT)
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This bug report was last modified 8 years and 29 days ago.
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