--- a/src/HOL/Library/Code_Test.thy Sun Jan 06 13:44:33 2019 +0100
+++ b/src/HOL/Library/Code_Test.thy Sun Jan 06 15:04:34 2019 +0100
@@ -142,6 +142,6 @@
subsection \<open>Test engine and drivers\<close>
-ML_file "code_test.ML"
+ML_file \<open>code_test.ML\<close>
end