From: Richard M. Stallman <rms@gnu.org>
Date: Mon, 20 Jan 2003 09:00:48 +0000 (+0000)
Subject: (regexp-opt-group): Compute HALF2 properly.
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(regexp-opt-group): Compute HALF2 properly.
---

diff --git a/lisp/emacs-lisp/regexp-opt.el b/lisp/emacs-lisp/regexp-opt.el
index b746c8a22f3..ea80801b610 100644
--- a/lisp/emacs-lisp/regexp-opt.el
+++ b/lisp/emacs-lisp/regexp-opt.el
@@ -223,7 +223,10 @@ so we can use character sets rather than grouping parenthesis."
 	      ;; particular letter and those that do not, and recurse on them.
 	      (let* ((char (char-to-string (string-to-char (car strings))))
 		     (half1 (all-completions char strings))
-		     (half2 (nthcdr (length half1) strings)))
+		     (half2 strings))
+		;; Remove from HALF2 whatever is in HALF1.
+		(dolist (elt half1)
+		  (setq half2 (delq elt half2)))
 		(concat open-group
 			(regexp-opt-group half1)
 			"\\|" (regexp-opt-group half2)