From: Richard M. Stallman <rms@gnu.org>
Date: Fri, 11 Jan 2002 01:05:49 +0000 (+0000)
Subject: Fix the double-property examples.  Include one with a bare lambda.
X-Git-Tag: ttn-vms-21-2-B4~17228
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=65500a82e5b128fad3e7f9ca3bb10f483aba8e43;p=emacs.git

Fix the double-property examples.  Include one with a bare lambda.
---

diff --git a/lispref/functions.texi b/lispref/functions.texi
index 9f684593a98..78e4a44327e 100644
--- a/lispref/functions.texi
+++ b/lispref/functions.texi
@@ -858,7 +858,7 @@ passing it a function to double a number:
 @example
 @group
 (defun double-property (symbol prop)
-  (change-property symbol prop (lambda (x) (* 2 x))))
+  (change-property symbol prop '(lambda (x) (* 2 x))))
 @end group
 @end example
 
@@ -892,6 +892,18 @@ do with the list.  Perhaps it will check whether the @sc{car} of the third
 element is the symbol @code{*}!  Using @code{function} tells the
 compiler it is safe to go ahead and compile the constant function.
 
+  Nowadays it is possible to omit @code{function} entirely, like this:
+
+@example
+@group
+(defun double-property (symbol prop)
+  (change-property symbol prop (lambda (x) (* 2 x))))
+@end group
+@end example
+
+@noindent
+This is because @code{lambda} itself implies @code{function}.
+
   We sometimes write @code{function} instead of @code{quote} when
 quoting the name of a function, but this usage is just a sort of
 comment: