diff -r 143f58bb34f9 -r 0909deb8059b src/HOL/Import/HOL_Light_Maps.thy
--- a/src/HOL/Import/HOL_Light_Maps.thy	Thu May 26 16:57:14 2016 +0200
+++ b/src/HOL/Import/HOL_Light_Maps.thy	Thu May 26 17:51:22 2016 +0200
@@ -5,7 +5,7 @@
 Based on earlier code by Steven Obua and Sebastian Skalberg
 *)
 
-section {* Type and constant mappings of HOL Light importer *}
+section \<open>Type and constant mappings of HOL Light importer\<close>
 
 theory HOL_Light_Maps
 imports Import_Setup