--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.nodes.test/src/org/graalvm/compiler/nodes/test/ObjectStampTest.java	2016-12-09 00:54:48.197369394 -0800
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2014, 2014, 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.nodes.test;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import org.graalvm.compiler.core.common.type.AbstractObjectStamp;
+import org.graalvm.compiler.core.common.type.Stamp;
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.core.common.type.TypeReference;
+
+public class ObjectStampTest extends AbstractObjectStampTest {
+    @Test
+    public void testInterfaceTrust0() {
+        Stamp notTrusted = StampFactory.object(TypeReference.createWithoutAssumptions(getMetaAccess().lookupJavaType(I.class)));
+        Assert.assertEquals(StampFactory.object(), notTrusted);
+    }
+
+    private interface TrustedI {
+
+    }
+
+    @Test
+    public void testInterfaceTrust1() {
+        Stamp trusted = StampFactory.object(getType(TrustedI.class));
+        Assert.assertNotEquals(StampFactory.object(), trusted);
+        Assert.assertTrue("Should be an AbstractObjectStamp", trusted instanceof AbstractObjectStamp);
+        AbstractObjectStamp trustedObjectStamp = (AbstractObjectStamp) trusted;
+        Assert.assertNotNull(trustedObjectStamp.type());
+        Assert.assertTrue("Should be an interface", trustedObjectStamp.type().isInterface());
+    }
+}