--- a/graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/runtime/SLNull.java	Tue Jun 02 21:15:59 2015 -0700
+++ b/graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/runtime/SLNull.java	Wed Jun 03 10:17:19 2015 +0200
@@ -22,6 +22,9 @@
  */
 package com.oracle.truffle.sl.runtime;
 
+import com.oracle.truffle.api.interop.ForeignAccessFactory;
+import com.oracle.truffle.api.interop.TruffleObject;
+
 /**
  * The SL type for a {@code null} (i.e., undefined) value. In Truffle, it is generally discouraged
  * to use the Java {@code null} value to represent the guest language {@code null} value. It is not
@@ -30,7 +33,7 @@
  * language {@code null} as a singleton, as in {@link #SINGLETON this class}, is the recommended
  * practice.
  */
-public final class SLNull {
+public final class SLNull implements TruffleObject {
 
     /**
      * The canonical value to represent {@code null} in SL.
@@ -52,4 +55,9 @@
     public String toString() {
         return "null";
     }
+
+    @Override
+    public ForeignAccessFactory getForeignAccessFactory() {
+        return SLFunctionForeignAccess.INSTANCE;
+    }
 }