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-rw-r--r--lisp/textmodes/rst.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/textmodes/rst.el b/lisp/textmodes/rst.el
index d24bcf7e2b..f94ba6949b 100644
--- a/lisp/textmodes/rst.el
+++ b/lisp/textmodes/rst.el
@@ -363,7 +363,7 @@ The value of this variable is used when Rst mode is turned on."
;; Use rst-mode for *.rst and *.rest files. Many ReStructured-Text files
;; use *.txt, but this is too generic to be set as a default.
-;;;###autoload (add-to-list 'auto-mode-alist '("\\.re?st\\'" . rst-mode))
+;;;###autoload (add-to-list 'auto-mode-alist (purecopy '("\\.re?st\\'" . rst-mode)))
;;;###autoload
(define-derived-mode rst-mode text-mode "ReST"
"Major mode for editing reStructuredText documents.