--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.ruby.nodes/src/com/oracle/truffle/ruby/nodes/objects/OpenModuleNode.java	Mon Jan 06 17:12:09 2014 +0000
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
+ * code is released under a tri EPL/GPL/LGPL license. You can use it,
+ * redistribute it and/or modify it under the terms of the:
+ *
+ * Eclipse Public License version 1.0
+ * GNU General Public License version 2
+ * GNU Lesser General Public License version 2.1
+ */
+package com.oracle.truffle.ruby.nodes.objects;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.ruby.nodes.*;
+import com.oracle.truffle.ruby.nodes.methods.*;
+import com.oracle.truffle.ruby.runtime.*;
+import com.oracle.truffle.ruby.runtime.core.*;
+
+/**
+ * Open a module and execute a method in it - probably to define new methods.
+ */
+public class OpenModuleNode extends RubyNode {
+
+    @Child protected RubyNode definingModule;
+    @Child protected MethodDefinitionNode definitionMethod;
+
+    public OpenModuleNode(RubyContext context, SourceSection sourceSection, RubyNode definingModule, MethodDefinitionNode definitionMethod) {
+        super(context, sourceSection);
+        this.definingModule = adoptChild(definingModule);
+        this.definitionMethod = adoptChild(definitionMethod);
+    }
+
+    @Override
+    public Object execute(VirtualFrame frame) {
+        CompilerAsserts.neverPartOfCompilation();
+
+        // Call the definition method with the module as self - there's no return value
+
+        final RubyModule module = (RubyModule) definingModule.execute(frame);
+        definitionMethod.executeMethod(frame).call(frame.pack(), module, null);
+
+        return NilPlaceholder.INSTANCE;
+    }
+
+}