--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javac/patterns/NullsInPatterns.java	Wed Nov 27 09:00:01 2019 +0100
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2017, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8231827
+ * @summary Testing pattern matching against the null constant
+ * @compile --enable-preview -source ${jdk.version} NullsInPatterns.java
+ * @run main/othervm --enable-preview NullsInPatterns
+ */
+import java.util.List;
+
+public class NullsInPatterns {
+
+    public static void main(String[] args) {
+        if (null instanceof List t) {
+            throw new AssertionError("broken");
+        } else {
+            System.out.println("null does not match List type pattern");
+        }
+        //reifiable types not allowed in type test patterns in instanceof:
+//        if (null instanceof List<Integer> l) {
+//            throw new AssertionError("broken");
+//        } else {
+//            System.out.println("null does not match List<Integer> type pattern");
+//        }
+        if (null instanceof List<?> l) {
+            throw new AssertionError("broken");
+        } else {
+            System.out.println("null does not match List<?> type pattern");
+        }
+    }
+}