--- old/src/java.compiler/share/classes/javax/annotation/processing/ProcessingEnvironment.java	2019-04-15 13:33:48.210000000 -0700
+++ new/src/java.compiler/share/classes/javax/annotation/processing/ProcessingEnvironment.java	2019-04-15 13:33:47.838000000 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2019, 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
@@ -131,4 +131,18 @@
      * effect
      */
     Locale getLocale();
+
+    /**
+     * Returns {@code true} if <em>preview features</em> are enabled
+     * and {@code false} otherwise.
+     * @return whether or not preview features are enabled
+     *
+     * @implSpec The default implementation of this method returns
+     * {@code false}.
+     *
+     * @since 13
+     */
+    default boolean isPreviewEnabled() {
+        return false;
+    }
 }