diff -r fd16c54261b3 -r 06bc494ca11e langtools/test/tools/javac/ImplicitToString.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/ImplicitToString.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,46 @@
+/*
+ * Copyright 1999 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/**
+ * @test
+ * @bug 4244408
+ * @summary toString() should be called implicitly when += is used.
+ *
+ * @run main ImplicitToString
+ */
+
+
+// The failure for this test is a ClassCastException when the code is run.
+
+import java.util.ArrayList;
+
+public class ImplicitToString {
+    public static void main(String[] args) {
+        String s = "";
+        ArrayList al = new ArrayList();
+        al.add(new Object());
+
+        // In the following line, toString() should be implicitly called.
+        s += al.get(0);
+    }
+}