--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.ruby.nodes/src/com/oracle/truffle/ruby/nodes/cast/BooleanCastNode.java	Mon Jan 06 17:12:09 2014 +0000
@@ -0,0 +1,60 @@
+/*
+ * 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.cast;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.dsl.*;
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.nodes.*;
+import com.oracle.truffle.ruby.nodes.*;
+import com.oracle.truffle.ruby.runtime.*;
+import com.oracle.truffle.ruby.runtime.core.*;
+
+/**
+ * Casts a value into a boolean. Works at the language level, so doesn't call any Ruby methods to
+ * cast non-core or monkey-patched objects.
+ */
+@NodeInfo(shortName = "cast-boolean")
+@NodeChild(value = "child", type = RubyNode.class)
+public abstract class BooleanCastNode extends RubyNode {
+
+    public BooleanCastNode(RubyContext context, SourceSection sourceSection) {
+        super(context, sourceSection);
+    }
+
+    public BooleanCastNode(BooleanCastNode copy) {
+        super(copy.getContext(), copy.getSourceSection());
+    }
+
+    @Specialization
+    public boolean doBoolean(boolean value) {
+        return value;
+    }
+
+    @Specialization
+    public boolean doNil(@SuppressWarnings("unused") NilPlaceholder nil) {
+        return false;
+    }
+
+    @Generic
+    public boolean doGeneric(Object object) {
+        if (object instanceof Boolean) {
+            return (boolean) object;
+        } else if (object instanceof NilPlaceholder || object instanceof RubyNilClass) {
+            return false;
+        } else {
+            return true;
+        }
+    }
+
+    @Override
+    public abstract boolean executeBoolean(VirtualFrame frame);
+
+}