diff --git a/src/test/examples/classmerging/ConflictingInterfaceSignaturesTest.java b/src/test/examples/classmerging/ConflictingInterfaceSignaturesTest.java
new file mode 100644
index 0000000..223ff37
--- /dev/null
+++ b/src/test/examples/classmerging/ConflictingInterfaceSignaturesTest.java
@@ -0,0 +1,32 @@
+// Copyright (c) 2018, the R8 project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+package classmerging;
+
+public class ConflictingInterfaceSignaturesTest {
+
+  public static void main(String[] args) {
+    A a = new InterfaceImpl();
+    a.foo();
+
+    B b = new InterfaceImpl();
+    b.foo();
+  }
+
+  public interface A {
+    void foo();
+  }
+
+  public interface B {
+    void foo();
+  }
+
+  public static final class InterfaceImpl implements A, B {
+
+    @Override
+    public void foo() {
+      System.out.println("In foo on InterfaceImpl");
+    }
+  }
+}
diff --git a/src/test/examples/classmerging/SimpleInterface.java b/src/test/examples/classmerging/SimpleInterface.java
new file mode 100644
index 0000000..e8ebcab
--- /dev/null
+++ b/src/test/examples/classmerging/SimpleInterface.java
@@ -0,0 +1,9 @@
+// Copyright (c) 2018, the R8 project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+package classmerging;
+
+public interface SimpleInterface {
+  void foo();
+}
diff --git a/src/test/examples/classmerging/SimpleInterfaceAccessTest.java b/src/test/examples/classmerging/SimpleInterfaceAccessTest.java
new file mode 100644
index 0000000..04b5386
--- /dev/null
+++ b/src/test/examples/classmerging/SimpleInterfaceAccessTest.java
@@ -0,0 +1,16 @@
+// Copyright (c) 2018, the R8 project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+package classmerging;
+
+import classmerging.pkg.SimpleInterfaceImplRetriever;
+
+public class SimpleInterfaceAccessTest {
+  public static void main(String[] args) {
+    // It is not possible to merge the interface SimpleInterface into SimpleInterfaceImpl, since
+    // this would lead to an illegal class access here.
+    SimpleInterface obj = SimpleInterfaceImplRetriever.getSimpleInterfaceImpl();
+    obj.foo();
+  }
+}
diff --git a/src/test/examples/classmerging/keep-rules.txt b/src/test/examples/classmerging/keep-rules.txt
index 814e889..da6ef55 100644
--- a/src/test/examples/classmerging/keep-rules.txt
+++ b/src/test/examples/classmerging/keep-rules.txt
@@ -7,9 +7,15 @@
 -keep public class classmerging.Test {
   public static void main(...);
 }
+-keep public class classmerging.ConflictingInterfaceSignaturesTest {
+  public static void main(...);
+}
 -keep public class classmerging.ExceptionTest {
   public static void main(...);
 }
+-keep public class classmerging.SimpleInterfaceAccessTest {
+  public static void main(...);
+}
 -keep public class classmerging.TemplateMethodTest {
   public static void main(...);
 }
diff --git a/src/test/examples/classmerging/pkg/SimpleInterfaceImplRetriever.java b/src/test/examples/classmerging/pkg/SimpleInterfaceImplRetriever.java
new file mode 100644
index 0000000..5cfa11e
--- /dev/null
+++ b/src/test/examples/classmerging/pkg/SimpleInterfaceImplRetriever.java
@@ -0,0 +1,25 @@
+// Copyright (c) 2018, the R8 project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+package classmerging.pkg;
+
+import classmerging.SimpleInterface;
+
+public class SimpleInterfaceImplRetriever {
+
+  public static SimpleInterface getSimpleInterfaceImpl() {
+    return new SimpleInterfaceImpl();
+  }
+
+  // This class is intentionally marked private. It is not possible to merge the interface
+  // SimpleInterface into SimpleInterfaceImpl, since this would lead to an illegal class access
+  // in SimpleInterfaceAccessTest.
+  private static class SimpleInterfaceImpl implements SimpleInterface {
+
+    @Override
+    public void foo() {
+      System.out.println("In foo on SimpleInterfaceImpl");
+    }
+  }
+}