(remove-hook): Doc string added.

Change a single function into a list.

1 files changed, 9 insertions, 1 deletions

diff --git a/lisp/emacs-lisp/lucid.el b/lisp/emacs-lisp/lucid.el
index 144aaf35b22..eaa405afd33 100644
--- a/lisp/emacs-lisp/lucid.el
+++ b/lisp/emacs-lisp/lucid.el
@@ -53,8 +53,16 @@
         (setcdr tail new-parent))))
 
 (defun remove-hook (hook-var function)
+  "Remove a function from a hook, if it is present.
+First argument HOOK-VAR (a symbol) is the name of a hook, second
+ argument FUNCTION is the function to remove (compared with `eq')."
   (if (boundp 'hook-var)
-      (set hook-var (delq function (symbol-value hook-var)))))
+      (let ((old (symbol-value hook-var)))
+        ;; If the hook value is a single function, turn it into a list.
+        (if (or (not (listp old)) (eq (car old) 'lambda))
+            (set hook-var (list old)))
+        ;; Now delete FUNCTION.
+        (set hook-var (delq function (symbol-value hook-var))))))
 
 (defun remprop (symbol prop)
   (let ((plist (symbol-plist symbol)))