defcustom standard-value (was: Re: BASE_PURESIZE)

[Dan Nicolaescu <dann@ics.uci.edu>]

Dan Nicolaescu <dann@ics.uci.edu> writes:

  > Another issue that I hit:
  > 
  > Changing (in files.el)
  > 
  > From:
  > (defcustom directory-free-space-program "df"
  > to:
  > (defcustom directory-free-space-program (purecopy "df")
  > 
  > does not get rid of the "df" string in GC memory.  The reason is
  > 
  > ELISP> (get 'directory-free-space-program 'standard-value)
  > ((purecopy "df"))
  > 
  > BTW, this is not a problem for autoloaded defcustoms, they get
  > transformed into defvars in loaddefs.el.

Is this patch TRTD?

Index: lisp/custom.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/custom.el,v
retrieving revision 1.149
diff -u -3 -p -r1.149 custom.el
--- lisp/custom.el    15 Sep 2009 04:08:04 -0000        1.149
+++ lisp/custom.el    29 Oct 2009 07:50:00 -0000
@@ -131,7 +131,7 @@ not the default value itself.
 DEFAULT is stored as SYMBOL's standard value, in SYMBOL's property
 `standard-value'.  At the same time, SYMBOL's property `force-value' is
 set to nil, as the value is no longer rogue."
-  (put symbol 'standard-value (list default))
+  (put symbol 'standard-value (purecopy (list default)))
   ;; Maybe this option was rogue in an earlier version.  It no longer is.
   (when (get symbol 'force-value)
     (put symbol 'force-value nil))