diff -r 000000000000 -r 959103a6100f test/tools/javac/foreach/SuperfluousAbstract.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/tools/javac/foreach/SuperfluousAbstract.java	Wed Apr 27 01:34:52 2016 +0800
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2003, 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 4912795
+ * @summary AbstractMethodError throws if not redeclare abstract iterator() method
+ * @author gafter
+ */
+
+import java.util.AbstractCollection;
+import java.util.Collection;
+import java.util.Iterator;
+
+interface Q<E> extends Collection<E> {}
+
+abstract class AbstractQ<E> extends AbstractCollection<E> implements Q<E> {
+    // Uncomment this to avoid the AbstractMethodError:
+    //public abstract Iterator<E> iterator();
+}
+
+class ConcreteQ<E> extends AbstractQ<E> {
+    public int size() { return 0; }
+    public Iterator<E> iterator() { return null; }
+}
+
+public class SuperfluousAbstract {
+    public static void main(String[] args) {
+        try {
+            Q<Integer> q = new ConcreteQ<Integer>() ;
+            for (Integer i : q) {}
+        }
+        catch (AbstractMethodError e) {
+            e.printStackTrace(System.err);
+        }
+        catch (NullPointerException e) {
+            // expected, since iterator() returns null
+        }
+    }
+}