--- a/src/java.base/share/classes/java/lang/Thread.java	Thu Feb 15 00:25:01 2018 -0800
+++ b/src/java.base/share/classes/java/lang/Thread.java	Thu Feb 15 13:37:20 2018 +0000
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1994, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1994, 2018, 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
@@ -150,9 +150,6 @@
     private Thread         threadQ;
     private long           eetop;
 
-    /* Whether or not to single_step this thread. */
-    private boolean     single_step;
-
     /* Whether or not the thread is a daemon thread. */
     private boolean     daemon = false;