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-rw-r--r--lisp/emacs-lisp/derived.el1
1 files changed, 1 insertions, 0 deletions
diff --git a/lisp/emacs-lisp/derived.el b/lisp/emacs-lisp/derived.el
index 3eafad177dd..6a11f1c3949 100644
--- a/lisp/emacs-lisp/derived.el
+++ b/lisp/emacs-lisp/derived.el
@@ -364,6 +364,7 @@ which more-or-less shadow%s %s's corresponding table%s."
(defsubst derived-mode-setup-function-name (mode)
"Construct a setup-function name based on a MODE name."
+ (declare (obsolete nil "28.1"))
(intern (concat (symbol-name mode) "-setup")))