diff -r e128ab544996 -r e9ab4ad7bd15 src/HOL/Tools/Predicate_Compile/core_data.ML
--- a/src/HOL/Tools/Predicate_Compile/core_data.ML	Thu Jan 11 12:32:07 2018 +0100
+++ b/src/HOL/Tools/Predicate_Compile/core_data.ML	Thu Jan 11 13:48:17 2018 +0100
@@ -301,7 +301,7 @@
   in
     fold Term.add_const_names intros []
       |> (fn cs =>
-        if member (=) cs @{const_name "HOL.eq"} then
+        if member (op =) cs @{const_name "HOL.eq"} then
           insert (op =) @{const_name Predicate.eq} cs
         else cs)
       |> filter (fn c => (not (c = key)) andalso