--- a/src/hotspot/share/jfr/recorder/checkpoint/types/jfrTypeSetUtils.hpp	Mon Oct 28 18:43:54 2019 +0100
+++ b/src/hotspot/share/jfr/recorder/checkpoint/types/jfrTypeSetUtils.hpp	Mon Oct 28 21:17:47 2019 +0100
@@ -99,12 +99,6 @@
 };
 
 template <typename T>
-class Stub {
- public:
-  bool operator()(T const& value) { return true; }
-};
-
-template <typename T>
 class SerializePredicate {
   bool _class_unload;
  public: