--- a/src/HOL/HOLCF/IOA/ABP/Packet.thy Wed Dec 30 21:56:12 2015 +0100
+++ b/src/HOL/HOLCF/IOA/ABP/Packet.thy Wed Dec 30 21:57:52 2015 +0100
@@ -2,7 +2,7 @@
Author: Olaf Müller
*)
-section {* Packets *}
+section \<open>Packets\<close>
theory Packet
imports Main