8074803: Name clash

Javac incorrectly reports a name clash.

Reviewed-by: mcimadamore

langtools/test/tools/javac/NameClash/NameClashTest.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2015 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 8074803
+ * @summary Incorrect name clash error
+ *
+ * @compile NameClashTest.java
+ */
+
+public class NameClashTest {
+
+    String log = "";
+
+    interface A1 {
+        A1 m(String s);
+    }
+
+    abstract class A2 implements A1 {
+        public abstract A2 m(String s);
+    }
+
+    interface B1 {
+        A1 m(String s);
+    }
+
+    interface B2 extends B1 {
+        A2 m(String s);
+    }
+
+    abstract class C extends A2 implements B2 {}
+
+    class D extends C {
+
+        public A2 m(String s) {
+            log += s;
+            return null;
+        }
+    }
+
+    public static void main(String[] args) {
+        NameClashTest nct = new NameClashTest();
+        A1 a1 = nct.new D();
+        a1.m("A1.m ");
+        A2 a2 = nct.new D();
+        a2.m("A2.m ");
+        B1 b1 = nct.new D();
+        b1.m("B1.m ");
+        B2 b2 = nct.new D();
+        b2.m("B2.m ");
+        C c = nct.new D();
+        c.m("C.m ");
+        D d = nct.new D();
+        d.m("D.m ");
+        if (!nct.log.equals("A1.m A2.m B1.m B2.m C.m D.m "))
+            throw new AssertionError("unexpected output: " + nct.log);
+    }
+}