From aefaa17a39fccfa6a942aa3dbb7c1dc300991550 Mon Sep 17 00:00:00 2001
From: ume <ume@FreeBSD.org>
Date: Sun, 3 Jun 2007 18:11:28 +0000
Subject: [PATCH] Vendor import of BIND 9.4.1

---
 lib/libc/include/isc/list.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/lib/libc/include/isc/list.h b/lib/libc/include/isc/list.h
index ad574ac2b587..c85c6676b51c 100644
--- a/lib/libc/include/isc/list.h
+++ b/lib/libc/include/isc/list.h
@@ -66,12 +66,16 @@
 		INSIST(LINKED(elt, link));\
 		if ((elt)->link.next != NULL) \
 			(elt)->link.next->link.prev = (elt)->link.prev; \
-		else \
+		else { \
+			INSIST((list).tail == (elt)); \
 			(list).tail = (elt)->link.prev; \
+		} \
 		if ((elt)->link.prev != NULL) \
 			(elt)->link.prev->link.next = (elt)->link.next; \
-		else \
+		else { \
+			INSIST((list).head == (elt)); \
 			(list).head = (elt)->link.next; \
+		} \
 		INIT_LINK_TYPE(elt, link, type); \
 	} while (0)
 #define UNLINK(list, elt, link) \
@@ -110,3 +114,4 @@
 #define DEQUEUE(list, elt, link) UNLINK(list, elt, link)
 
 #endif /* LIST_H */
+/*! \file */