diff --git a/js2/src/js2engine.cpp b/js2/src/js2engine.cpp
index adabea7ba8e5..094841ed8272 100644
--- a/js2/src/js2engine.cpp
+++ b/js2/src/js2engine.cpp
@@ -125,13 +125,16 @@ float64 *JS2Engine::newDoubleValue(float64 x)
 
 // if the argument can be stored as an integer value, do so
 // otherwise get a double value
-void JS2Engine::pushNumber(float64 x)
+js2val JS2Engine::pushNumber(float64 x)
 {
     uint32 i;
+    js2val retval;
     if (JSDOUBLE_IS_INT(x, i) && INT_FITS_IN_JS2VAL(i))
-        push(INT_TO_JS2VAL(i));
+        retval = INT_TO_JS2VAL(i);
     else
-        push(DOUBLE_TO_JS2VAL(newDoubleValue(x)));
+        retval = DOUBLE_TO_JS2VAL(newDoubleValue(x));
+    push(retval);
+    return retval;
 }
 
 // Convert an integer to a string
diff --git a/js2/src/js2engine.h b/js2/src/js2engine.h
index fa1e20ac2f25..f9844b6a4012 100644
--- a/js2/src/js2engine.h
+++ b/js2/src/js2engine.h
@@ -82,7 +82,7 @@ public:
 
     size_t errorPos();
 
-    void pushNumber(float64 x);
+    js2val pushNumber(float64 x);
 
 #define MAX_EXEC_STACK (20)
 
diff --git a/js2/src/js2metadata.cpp b/js2/src/js2metadata.cpp
index 296aa516b077..d1d2cd0ef8ba 100644
--- a/js2/src/js2metadata.cpp
+++ b/js2/src/js2metadata.cpp
@@ -178,6 +178,18 @@ namespace MetaData {
             break;
         case StmtNode::Use:
             {
+                UseStmtNode *u = checked_cast<UseStmtNode *>(p);
+                ExprList *eList = u->namespaces;
+                while (eList) {
+                    js2val av = EvalExpression(env, CompilePhase, eList->expr);
+                    if (JS2VAL_IS_NULL(av) || !JS2VAL_IS_OBJECT(av))
+                        reportError(Exception::badValueError, "Namespace expected in use directive", p->pos);
+                    JS2Object *obj = JS2VAL_TO_OBJECT(av);
+                    if ((obj->kind != AttributeObjectKind) || (checked_cast<Attribute *>(obj)->attrKind != Attribute::NamespaceAttr))
+                        reportError(Exception::badValueError, "Namespace expected in use directive", p->pos);
+                    cxt->openNamespaces.push_back(checked_cast<Namespace *>(obj));                    
+                    eList = eList->next;
+                }
             }
             break;
         }   // switch (p->getKind())
@@ -253,14 +265,6 @@ namespace MetaData {
             break;
         case StmtNode::Use:
             {
-                UseStmtNode *u = checked_cast<UseStmtNode *>(p);
-                ExprList *eList = u->namespaces;
-                while (eList) {
-                    Reference *r = EvalExprNode(env, phase, eList->expr);
-                    if (r) r->emitReadBytecode(bCon, p->pos);
-                    bCon->emitOp(eUse, p->pos);
-                    eList = eList->next;
-                }
             }
             break;
         default:
@@ -585,8 +589,8 @@ namespace MetaData {
             {
                 BinaryExprNode *b = checked_cast<BinaryExprNode *>(p);
                 Reference *lVal = EvalExprNode(env, phase, b->op1);
-                Reference *rVal = EvalExprNode(env, phase, b->op2);
                 if (lVal) lVal->emitReadBytecode(bCon, p->pos);
+                Reference *rVal = EvalExprNode(env, phase, b->op2);
                 if (rVal) rVal->emitReadBytecode(bCon, p->pos);
                 bCon->emitOp(ePlus, p->pos);
             }
@@ -628,6 +632,7 @@ namespace MetaData {
             {
                 IdentifierExprNode *i = checked_cast<IdentifierExprNode *>(p);
                 returnRef = new LexicalReference(i->name, cxt.strict);
+                ((LexicalReference *)returnRef)->variableMultiname->addNamespace(cxt);
                 ((LexicalReference *)returnRef)->emitBindBytecode(bCon, p->pos);
             }
             break;
diff --git a/js2/src/js2op_arithmetic.cpp b/js2/src/js2op_arithmetic.cpp
index ddd27ac19872..f58ca6d713d2 100644
--- a/js2/src/js2op_arithmetic.cpp
+++ b/js2/src/js2op_arithmetic.cpp
@@ -44,12 +44,13 @@
 	        String *bstr = toString(b);
                 String *c = new String(*astr);
                 *c += *bstr;
-	        push(STRING_TO_JS2VAL(c));
+                retval = STRING_TO_JS2VAL(c);
+	        push(retval);
 	    }
 	    else {
                 float64 anum = toNumber(a);
                 float64 bnum = toNumber(b);
-                pushNumber(anum + bnum);
+                retval = pushNumber(anum + bnum);
 	    } 
         }
         break;