GNU bug report logs - #17498
24.4.50; This function has a compiler macro `yes--cmacro'.

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Leo Liu <sdl.web <at> gmail.com>
Subject: bug#17498: closed (Re: bug#17498: 24.4.50; This function has a
 compiler macro `yes--cmacro'.)
Date: Fri, 16 May 2014 18:27:02 +0000

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Your bug report

#17498: 24.4.50; This function has a compiler macro `yes--cmacro'.

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 17498 <at> debbugs.gnu.org.

-- 
17498: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=17498
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Leo Liu <sdl.web <at> gmail.com>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 17498-done <at> debbugs.gnu.org
Subject: Re: bug#17498: 24.4.50;
 This function has a compiler macro `yes--cmacro'.
Date: Sat, 17 May 2014 02:25:57 +0800

On 2014-05-16 08:24 -0400, Stefan Monnier wrote:
> Well, there's always some other way, but yes it's made so that it works
> when byte-compiling.

OK and thanks for the explanation. It took me by a surprise.

Leo

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From: Leo Liu <sdl.web <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.4.50; This function has a compiler macro `yes--cmacro'.
Date: Thu, 15 May 2014 23:05:18 +0800

Eval the following code

;;;; BEGIN
(defun yes ()
  )
(when nil
  (cl-define-compiler-macro yes (&rest _)))
;;;; END

,----[ C-h f yes RET ]
| yes is a Lisp function.
| 
| (yes)
| 
| This function has a compiler macro `yes--cmacro'.
| 
| Not documented.
| 
| [back]
`----

how is it possible? the compiler macro is defined at macro expansion
time?

Leo

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