diff -r a80d8ec6c998 -r 3dda49e08b9d src/HOL/Code_Numeral.thy
--- a/src/HOL/Code_Numeral.thy	Fri Jan 04 21:49:06 2019 +0100
+++ b/src/HOL/Code_Numeral.thy	Fri Jan 04 23:22:53 2019 +0100
@@ -668,8 +668,8 @@
 
 setup \<open>
   fold (fn target =>
-    Numeral.add_code @{const_name Code_Numeral.Pos} I Code_Printer.literal_numeral target
-    #> Numeral.add_code @{const_name Code_Numeral.Neg} (~) Code_Printer.literal_numeral target)
+    Numeral.add_code \<^const_name>\<open>Code_Numeral.Pos\<close> I Code_Printer.literal_numeral target
+    #> Numeral.add_code \<^const_name>\<open>Code_Numeral.Neg\<close> (~) Code_Printer.literal_numeral target)
     ["SML", "OCaml", "Haskell", "Scala"]
 \<close>