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-rw-r--r--lisp/cus-start.el4
1 files changed, 2 insertions, 2 deletions
diff --git a/lisp/cus-start.el b/lisp/cus-start.el
index 20bc6ade740..ce0a2206208 100644
--- a/lisp/cus-start.el
+++ b/lisp/cus-start.el
@@ -191,8 +191,8 @@
(parse-sexp-ignore-comments editing-basics boolean)
(words-include-escapes editing-basics boolean)
;; window.c
- (temp-buffer-show-function windows function)
- (display-buffer-function windows function)
+ (temp-buffer-show-function windows (choice (const nil) function))
+ (display-buffer-function windows (choice (const nil) function))
(pop-up-frames frames boolean)
(pop-up-frame-function frames function)
(special-display-buffer-names