Changing Refrence.set(Object) to return Object to return the real stored value.

js/rhino/src/org/mozilla/javascript/Interpreter.java

@@ -2513,8 +2513,7 @@ switch (op) {
         --stackTop;
         Object lhs = stack[stackTop];
         if (lhs == DBL_MRK) lhs = doubleWrap(sDbl[stackTop]);
-        ScriptRuntime.setReference(lhs, rhs);
-        stack[stackTop] = rhs;
+        stack[stackTop] = ScriptRuntime.setReference(lhs, rhs);
         continue Loop;
     }
     case Icode_REF_INC_DEC : {

js/rhino/src/org/mozilla/javascript/Reference.java

@@ -46,7 +46,7 @@ public abstract class Reference
 {
     public abstract Object get();
 
-    public abstract void set(Object value);
+    public abstract Object set(Object value);
 
     public void delete()
     {

js/rhino/src/org/mozilla/javascript/ScriptRuntime.java

@@ -1265,7 +1265,7 @@ public class ScriptRuntime {
         return ref.get();
     }
 
-    public static void setReference(Object obj, Object value)
+    public static Object setReference(Object obj, Object value)
     {
         if (!(obj instanceof Reference)) {
             String msg = getMessage2("msg.no.ref.to.set",
@@ -1273,7 +1273,7 @@ public class ScriptRuntime {
             throw constructError("ReferenceError", msg);
         }
         Reference ref = (Reference)obj;
-        ref.set(value);
+        return ref.set(value);
     }
 
     static boolean isSpecialProperty(String s)
@@ -1306,12 +1306,12 @@ public class ScriptRuntime {
                 }
             }
 
-            public void set(Object value)
+            public Object set(Object value)
             {
                 if (id == PROTO) {
-                    setProto(obj, value, scope);
+                    return setProto(obj, value, scope);
                 } else {
-                    setParent(obj, value, scope);
+                    return setParent(obj, value, scope);
                 }
             }
         };

js/rhino/src/org/mozilla/javascript/optimizer/Codegen.java

@@ -3486,11 +3486,9 @@ class BodyCodegen
                 "getReference", "(Ljava/lang/Object;)Ljava/lang/Object;");
         }
         generateCodeFromNode(child, node);
-        cfw.add(ByteCode.DUP_X1);
-        // stack: value ref value
         addScriptRuntimeInvoke(
-            "setReference", "(Ljava/lang/Object;Ljava/lang/Object;)V");
-        // stack: value
+            "setReference",
+            "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");
     }
 
     private void visitBind(Node node, Node child)