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-rw-r--r--lisp/cus-start.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/cus-start.el b/lisp/cus-start.el
index c2a3a32e218..2709588840e 100644
--- a/lisp/cus-start.el
+++ b/lisp/cus-start.el
@@ -179,7 +179,7 @@
"21.1")
(minibuffer-auto-raise minibuffer boolean)
;; options property set at end
- (read-buffer-function minibuffer (choice nil function))
+ (read-buffer-function minibuffer (choice (const nil) function))
;; msdos.c
(dos-unsupported-char-glyph display integer)
;; process.c