From b8aa90130cf57a8aa6b9e38c798350ee3032efff Mon Sep 17 00:00:00 2001
From: Makarius Wenzel
Date: Thu, 18 Oct 2007 13:34:54 +0000
Subject: isar-undo-fail-regexp: only isar-keywords-control, not
 isar-keywords-theory-end;

---
 isar/isar-syntax.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/isar/isar-syntax.el b/isar/isar-syntax.el
index db5ead6f..98f5798a 100644
--- a/isar/isar-syntax.el
+++ b/isar/isar-syntax.el
@@ -477,7 +477,7 @@ matches contents of quotes for quoted identifiers.")
 
 (defconst isar-undo-fail-regexp
   (proof-anchor-regexp
-   (isar-ids-to-regexp (append isar-keywords-control isar-keywords-theory-end))))
+   (isar-ids-to-regexp isar-keywords-control)))
 
 (defconst isar-undo-skip-regexp
   (proof-anchor-regexp (proof-regexp-alt (isar-ids-to-regexp isar-keywords-diag) ";")))
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