GNU bug report logs - #4290
23.1; (elisp)Anonymous Functions - unclear about #'

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From: help-debbugs <at> gnu.org (Emacs bug Tracking System)
To: "Drew Adams" <drew.adams <at> oracle.com>
Subject: bug#4290 closed by Chong Yidong <cyd <at> stupidchicken.com> (Re:
 23.1; (elisp)Anonymous Functions - unclear about #')
Date: Sun, 13 Sep 2009 01:55:09 +0000

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This is an automatic notification regarding your bug report
which was filed against the emacs package:

#4290: 23.1; (elisp)Anonymous Functions - unclear about #'

It has been closed by Chong Yidong <cyd <at> stupidchicken.com>.

Their explanation is attached below along with your original report.
If this explanation is unsatisfactory and you have not received a
better one in a separate message then please contact Chong Yidong <cyd <at> stupidchicken.com> by
replying to this email.


-- 
4290: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=4290
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Contact help-debbugs <at> gnu.org with problems

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From: Chong Yidong <cyd <at> stupidchicken.com>
To: "Drew Adams" <drew.adams <at> oracle.com>
Cc: 4290-done <at> debbugs.gnu.org
Subject: Re: 23.1; (elisp)Anonymous Functions - unclear about #'
Date: Sat, 12 Sep 2009 21:49:48 -0400

I have clarified the text.  Thanks for the bug report.

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From: "Drew Adams" <drew.adams <at> oracle.com>
To: <bug-gnu-emacs <at> gnu.org>
Subject: 23.1; (elisp)Anonymous Functions - unclear about #'
Date: Sat, 29 Aug 2009 14:07:31 -0700

This Info node is unclear. It combines pre-Emacs 22 text that
explicitly says that lambda forms are *not* byte-compiled unless you
use `#'' or `function', with this statement that says that they are:
 
  Nowadays it is possible to omit `function' entirely, like this:
     (defun double-property (symbol prop)
       (change-property symbol prop (lambda (x) (* 2 x))))
  This is because `lambda' itself implies `function'.
 
What should be said is something like this:
 
"Starting with Emacs 22, a lambda form is byte-compiled when it is used
as a function, regardless of whether it is preceded by `function' or
`#''.  With Emacs versions prior to 22, you must explicitly use `#''
or `function' if you want the form to be byte-compiled."
 
This means rewording or replacing the paragraph that says that unless
you use `function' a lambda form won't be byte-compiled. The example
and its accompanying text need to be clarified.
 

In GNU Emacs 23.1.1 (i386-mingw-nt5.1.2600)
 of 2009-07-29 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.4)'
 

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