--- old/src/jdk/nashorn/internal/codegen/CodeGenerator.java	2014-06-03 15:48:31.420050753 +0530
+++ new/src/jdk/nashorn/internal/codegen/CodeGenerator.java	2014-06-03 15:48:31.200049666 +0530
@@ -1500,7 +1500,9 @@
         method.dup();
         if (protoNode != null) {
             load(protoNode);
-            method.invoke(ScriptObject.SET_PROTO_CHECK);
+            // take care of { __proto__: 34 } or some such!
+            method.convert(Type.OBJECT);
+            method.invoke(ScriptObject.SET_PROTO_FROM_LITERAL);
         } else {
             globalObjectPrototype();
             method.invoke(ScriptObject.SET_PROTO);