--- old/src/hotspot/share/gc/shared/workgroup.hpp	2020-04-20 04:35:54.699156529 -0400
+++ new/src/hotspot/share/gc/shared/workgroup.hpp	2020-04-20 04:35:54.364156526 -0400
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2002, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -324,6 +324,8 @@
   // Set all tasks to unclaimed.
   void clear();
 
+  NONCOPYABLE(SubTasksDone);
+
 public:
   // Initializes "this" to a state in which there are "n" tasks to be
   // processed, none of the which are originally claimed.  The number of