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-rw-r--r--lisp/emacs-lisp/regexp-opt.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/emacs-lisp/regexp-opt.el b/lisp/emacs-lisp/regexp-opt.el
index 18bd094e4d4..51ed53e71fc 100644
--- a/lisp/emacs-lisp/regexp-opt.el
+++ b/lisp/emacs-lisp/regexp-opt.el
@@ -226,7 +226,7 @@ This means the number of non-shy regexp grouping constructs
;; Otherwise, divide the list into those that start with a
;; particular letter and those that do not, and recurse on them.
- (let* ((char (char-to-string (string-to-char (car strings))))
+ (let* ((char (substring-no-properties (car strings) 0 1))
(half1 (all-completions char strings))
(half2 (nthcdr (length half1) strings)))
(concat open-group