--- a/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/DefaultMaterializedFrame.java	Mon Feb 04 13:21:13 2013 +0100
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/DefaultMaterializedFrame.java	Tue Feb 05 15:19:17 2013 +0100
@@ -25,7 +25,7 @@
 import com.oracle.truffle.api.*;
 import com.oracle.truffle.api.frame.*;
 
-final class DefaultMaterializedFrame implements MaterializedFrame {
+final class DefaultMaterializedFrame implements MaterializedFrame, PackedFrame {
 
     private final DefaultVirtualFrame wrapped;
 
@@ -102,4 +102,19 @@
     public void updateToLatestVersion() {
         wrapped.updateToLatestVersion();
     }
+
+    @Override
+    public PackedFrame pack() {
+        return this;
+    }
+
+    @Override
+    public MaterializedFrame materialize() {
+        return this;
+    }
+
+    @Override
+    public Frame unpack() {
+        return this;
+    }
 }