--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.ruby.runtime/src/com/oracle/truffle/ruby/runtime/control/RaiseException.java	Mon Jan 06 17:12:09 2014 +0000
@@ -0,0 +1,44 @@
+/*
+ * 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.runtime.control;
+
+import com.oracle.truffle.ruby.runtime.objects.*;
+
+/**
+ * Ruby exceptions are just Ruby objects, so they cannot also be exceptions unless we made all Ruby
+ * objects exceptions. A simpler approach is to wrap Ruby exceptions in Java exceptions when we want
+ * to throw them. The error messages match MRI. Note that throwing is different to raising in Ruby,
+ * which is the reason we have both {@link ThrowException} and {@link RaiseException}.
+ */
+public class RaiseException extends RuntimeException {
+
+    private final RubyBasicObject rubyException;
+
+    public RaiseException(RubyBasicObject rubyException) {
+        this.rubyException = rubyException;
+    }
+
+    @Override
+    public String toString() {
+        return rubyException.toString();
+    }
+
+    @Override
+    public String getMessage() {
+        return rubyException.toString();
+    }
+
+    public RubyBasicObject getRubyException() {
+        return rubyException;
+    }
+
+    private static final long serialVersionUID = 7501185855599094740L;
+
+}