(show-trailing-whitespace): Safe if boolean. (Bug#5312)

2 files changed, 5 insertions, 0 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 60a443223be..2b14d89c325 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,7 @@
+2010-01-14  Glenn Morris  <rgm@gnu.org>
+
+        * frame.el (show-trailing-whitespace): Safe if boolean.  (Bug#5312)
+
 2010-01-14  Kenichi Handa  <handa@m17n.org>
 
         * composite.el (auto-composition-mode): Make it a buffer local
diff --git a/lisp/frame.el b/lisp/frame.el
index e2ae65f1ccc..0628db7ee38 100644
--- a/lisp/frame.el
+++ b/lisp/frame.el
@@ -1525,6 +1525,7 @@ left untouched.  FRAME nil or omitted means use the selected frame."
   "Non-nil means highlight trailing whitespace.
 This is done in the face `trailing-whitespace'."
   :type 'boolean
+  :safe 'booleanp
   :group 'whitespace-faces)