--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/ConcreteSubtypeTest.java	2016-12-09 00:47:27.182930108 -0800
@@ -0,0 +1,74 @@
+/*
+ * 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.
+ */
+package org.graalvm.compiler.core.test;
+
+import jdk.vm.ci.meta.Assumptions.Assumption;
+import jdk.vm.ci.meta.Assumptions.ConcreteSubtype;
+
+import org.junit.Test;
+
+import org.graalvm.compiler.nodes.StructuredGraph;
+
+/**
+ * Ensure that abstract classes with a single implementor are properly optimized and that loading a
+ * subclass below the leaf type triggers invalidation.
+ */
+public class ConcreteSubtypeTest extends GraalCompilerAssumptionsTest {
+    abstract static class AbstractBase {
+        abstract void check();
+    }
+
+    static class Subclass extends AbstractBase {
+        @Override
+        public void check() {
+            throw new InternalError();
+        }
+    }
+
+    static class SubSubclass extends Subclass {
+        @Override
+        public void check() {
+        }
+    }
+
+    public void callAbstractType(AbstractBase object) {
+        object.check();
+    }
+
+    @Override
+    protected void checkGraph(Assumption expectedAssumption, StructuredGraph graph) {
+        super.checkGraph(expectedAssumption, graph);
+        assertTrue(graph.isTrivial());
+    }
+
+    /**
+     * Test that {@link #callAbstractType} gets compiled into an empty method with a
+     * {@link ConcreteSubtype} assumption on {@link AbstractBase} and {@link Subclass}. Then ensures
+     * that loading and initialization of {@link SubSubclass} causes the compiled method to be
+     * invalidated.
+     */
+    @Test
+    public void testLeafAbstractType() {
+        testAssumptionInvalidate("callAbstractType", new ConcreteSubtype(resolveAndInitialize(AbstractBase.class), resolveAndInitialize(Subclass.class)), "SubSubclass");
+    }
+}