* subr.el (string-or-null-p): New function.

* textmodes/paragraphs.el (sentence-end): Use string-or-null-p.

* textmodes/ispell.el (ispell-local-dictionary): Use
string-or-null-p.

* files.el: Update comment about safe-local-variable declarations.

2 files changed, 2 insertions, 2 deletions

diff --git a/lisp/textmodes/ispell.el b/lisp/textmodes/ispell.el
index 8a08f9dd078..da77508dce3 100644
--- a/lisp/textmodes/ispell.el
+++ b/lisp/textmodes/ispell.el
@@ -462,7 +462,7 @@ is automatically set when defined in the file with either
   :type '(choice string
                  (const :tag "default" nil))
   :group 'ispell)
-;;;###autoload(put 'ispell-local-dictionary 'safe-local-variable (lambda (a) (or (stringp a) (null a))))
+;;;###autoload(put 'ispell-local-dictionary 'safe-local-variable 'string-or-null-p)
 
 (make-variable-buffer-local 'ispell-local-dictionary)
 
diff --git a/lisp/textmodes/paragraphs.el b/lisp/textmodes/paragraphs.el
index c62f337e456..6693be4e0c9 100644
--- a/lisp/textmodes/paragraphs.el
+++ b/lisp/textmodes/paragraphs.el
@@ -163,7 +163,7 @@ function `sentence-end'.  You should always use this function
 to obtain the value of this variable."
   :group 'paragraphs
   :type '(choice regexp (const :tag "Use default value" nil)))
-;;;###autoload(put 'sentence-end 'safe-local-variable (lambda (a) (or (stringp a) (null a))))
+;;;###autoload(put 'sentence-end 'safe-local-variable 'string-or-null-p)
 
 (defcustom sentence-end-base "[.?!][]\"'$B!I$,1r}(B)}]*"
   "*Regexp matching the basic end of a sentence, not including following space."