Index: ironruby/Compiler/AST/Variables.cs
===================================================================
--- ironruby/Compiler/AST/Variables.cs	(revision 76)
+++ ironruby/Compiler/AST/Variables.cs	(working copy)
@@ -50,5 +50,10 @@
             : base(location) {
             this.number = number;
         }
+
+        internal override MSA.Expression TransformRead(AstGenerator gen)
+        {
+            return Ast.Null();
+        }
     }
 }
\ No newline at end of file