--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/langtools/tools/javac/switchextra/DefiniteAssignment1.java	Mon Jun 10 05:09:52 2019 +0200
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 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
+ * @summary Verify that definite assignment works (legal code)
+ * @compile --enable-preview -source ${jdk.version} DefiniteAssignment1.java
+ * @run main/othervm --enable-preview DefiniteAssignment1
+ */
+public class DefiniteAssignment1 {
+    public static void main(String[] args) {
+        int a = 0;
+
+        {
+        int x;
+
+        switch(a) {
+            case 0: x = 0; break;
+            default: x = 1; break;
+        }
+
+        if (x != 0)
+            throw new IllegalStateException("Unexpected value.");
+        }
+
+        {
+        int x;
+
+        switch(a) {
+            case 1: x = 1; break;
+            case 0:
+            default: x = 0; break;
+        }
+
+        if (x != 0)
+            throw new IllegalStateException("Unexpected value.");
+        }
+
+        {
+        int x;
+
+        switch(a) {
+            case 1: x = 1; break;
+            case 0:
+            default: x = 0;
+        }
+
+        if (x != 0)
+            throw new IllegalStateException("Unexpected value.");
+        }
+
+        {
+        int x;
+
+        switch(a) {
+            case 0 -> x = 0;
+            default -> x = 1;
+        }
+
+        if (x != 0)
+            throw new IllegalStateException("Unexpected value.");
+        }
+
+        {
+        int x;
+
+        try {
+            switch(a) {
+                case 1: x = 1; break;
+                case 0:
+                default: throw new UnsupportedOperationException();
+            }
+
+            throw new IllegalStateException("Unexpected value: " + x);
+            } catch (UnsupportedOperationException ex) {
+                //OK
+            }
+        }
+
+        {
+        int x;
+
+        switch(a) {
+            case 0 -> x = 0;
+            default -> throw new IllegalStateException();
+        }
+
+        if (x != 0)
+            throw new IllegalStateException("Unexpected value.");
+        }
+    }
+
+    enum E {
+        A, B, C;
+    }
+}