gistfile1.txt

diff --git a/src/vm/jvm/QAST/Compiler.nqp b/src/vm/jvm/QAST/Compiler.nqp
index 5a99933..1858261 100644
--- a/src/vm/jvm/QAST/Compiler.nqp
+++ b/src/vm/jvm/QAST/Compiler.nqp
@@ -2463,8 +2463,8 @@ QAST::OperationsJAST.map_classlib_core_op('iterval', $TYPE_OPS, 'iterval', [$RT_

 (-> {
 # object opcodes
-QAST::OperationsJAST.map_jvm_core_op('null', 'aconst_null', [], $RT_OBJ);
-QAST::OperationsJAST.map_jvm_core_op('null_s', 'aconst_null', [], $RT_STR);
+QAST::OperationsJAST.map_classlib_core_op('null', $TYPE_OPS, 'vmnull', [], $RT_OBJ, :tc);
+QAST::OperationsJAST.map_classlib_core_op('null_s', $TYPE_OPS, 'vmnull_s', [], $RT_STR, :tc);
 QAST::OperationsJAST.map_classlib_core_op('what', $TYPE_OPS, 'what', [$RT_OBJ], $RT_OBJ, :tc);
 QAST::OperationsJAST.map_classlib_core_op('how', $TYPE_OPS, 'how', [$RT_OBJ], $RT_OBJ, :tc);
 QAST::OperationsJAST.map_classlib_core_op('who', $TYPE_OPS, 'who', [$RT_OBJ], $RT_OBJ, :tc);
diff --git a/src/vm/jvm/runtime/org/perl6/nqp/runtime/Ops.java b/src/vm/jvm/runtime/org/perl6/nqp/runtime/Ops.java
index af0bfbe..1429541 100644
--- a/src/vm/jvm/runtime/org/perl6/nqp/runtime/Ops.java
+++ b/src/vm/jvm/runtime/org/perl6/nqp/runtime/Ops.java
@@ -6714,6 +6714,15 @@ public final class Ops {
         return name;
     }

+    public static String vmnull_s(ThreadContext tc) {
+        String foo = null;
+        return foo;
+    }
+
+    public static SixModelObject vmnull(ThreadContext tc) {
+        return REPRRegistry.getByName("VMNull").type_object_for(tc, tc.gc.KnowHOW);
+    }
+
     public static String getuniprop_str(long codepoint, long property, ThreadContext tc) {
         return "";
     }
diff --git a/src/vm/jvm/runtime/org/perl6/nqp/sixmodel/REPRRegistry.java b/src/vm/jvm/runtime/org/perl6/nqp/sixmodel/REPRRegistry.java
index 87957a9..328cf8a 100644
--- a/src/vm/jvm/runtime/org/perl6/nqp/sixmodel/REPRRegistry.java
+++ b/src/vm/jvm/runtime/org/perl6/nqp/sixmodel/REPRRegistry.java
@@ -32,6 +32,7 @@ import org.perl6.nqp.sixmodel.reprs.VMArray;
 import org.perl6.nqp.sixmodel.reprs.VMException;
 import org.perl6.nqp.sixmodel.reprs.VMHash;
 import org.perl6.nqp.sixmodel.reprs.VMIter;
+import org.perl6.nqp.sixmodel.reprs.VMNull;
 import org.perl6.nqp.sixmodel.reprs.VMThread;
 import org.perl6.nqp.sixmodel.reprs.ReentrantMutex;
 import org.perl6.nqp.sixmodel.reprs.Semaphore;
@@ -104,5 +105,6 @@ public class REPRRegistry {
         addREPR("AsyncTask", new AsyncTask());
         addREPR("NativeRef", new NativeRef());
         addREPR("MultiDimArray", new MultiDimArray());
+        addREPR("VMNull", new VMNull());
     }
 }
diff --git a/src/vm/jvm/runtime/org/perl6/nqp/sixmodel/reprs/VMNull.java b/src/vm/jvm/runtime/org/perl6/nqp/sixmodel/reprs/VMNull.java
new file mode 100644
index 0000000..6cbdba7
--- /dev/null
+++ b/src/vm/jvm/runtime/org/perl6/nqp/sixmodel/reprs/VMNull.java
@@ -0,0 +1,38 @@
+package org.perl6.nqp.sixmodel.reprs;
+
+import org.perl6.nqp.sixmodel.REPR;
+import org.perl6.nqp.sixmodel.SerializationReader;
+import org.perl6.nqp.sixmodel.SixModelObject;
+import org.perl6.nqp.sixmodel.STable;
+import org.perl6.nqp.sixmodel.TypeObject;
+import org.perl6.nqp.sixmodel.reprs.P6OpaqueREPRData;
+import org.perl6.nqp.runtime.ExceptionHandling;
+import org.perl6.nqp.runtime.ThreadContext;
+
+
+public class VMNull extends REPR {
+
+    public SixModelObject allocate(ThreadContext tc, STable st) {
+        throw ExceptionHandling.dieInternal(tc, "Cannot instantiate this REPR");
+    }
+
+    public SixModelObject type_object_for(ThreadContext tc, SixModelObject HOW) {
+        STable st = new STable(this, HOW);
+        st.REPRData = new P6OpaqueREPRData();
+        SixModelObject obj = new TypeObject();
+        obj.st = st;
+        st.WHAT = obj;
+        return st.WHAT;
+    }
+
+    public void compose(ThreadContext tc, STable st, SixModelObject repr_info) {
+        throw ExceptionHandling.dieInternal(tc, "Cannot compose this REPR");
+    }
+
+    public SixModelObject deserialize_stub(ThreadContext tc, STable st) {
+        throw ExceptionHandling.dieInternal(tc, "This REPR does not participate in serialization");
+    }
+    public void deserialize_finish(ThreadContext tc, STable st, SerializationReader reader, SixModelObject obj) {
+        throw ExceptionHandling.dieInternal(tc, "This REPR does not participate in serialization");
+    }
+}