diff -r d80b2df54d31 -r a96320074298 src/HOL/Library/Old_Recdef.thy
--- a/src/HOL/Library/Old_Recdef.thy	Sun Jan 06 13:44:33 2019 +0100
+++ b/src/HOL/Library/Old_Recdef.thy	Sun Jan 06 15:04:34 2019 +0100
@@ -57,7 +57,7 @@
 lemma tfl_exE: "\<exists>x. P x \<Longrightarrow> \<forall>x. P x \<longrightarrow> Q \<Longrightarrow> Q"
   by blast
 
-ML_file "old_recdef.ML"
+ML_file \<open>old_recdef.ML\<close>
 
 
 subsection \<open>Rule setup\<close>