Fix for issue 545: don't reuse this VariableProxy.

src/scopes.h

Index: src/scopes.h
diff --git a/src/scopes.h b/src/scopes.h
index fc627df619b4c776ab5e43dfafdbba840cc5aaa9..9b506d989ea2243f49d50fa40ebdb0ae15b08b44 100644
--- a/src/scopes.h
+++ b/src/scopes.h
@@ -206,8 +206,13 @@ class Scope: public ZoneObject {
   // ---------------------------------------------------------------------------
   // Accessors.
 
-  // The variable corresponding to the (function) receiver.
-  VariableProxy* receiver() const  { return receiver_; }
+  // A new variable proxy corresponding to the (function) receiver.
+  VariableProxy* receiver() const {
+    VariableProxy* proxy =
+        new VariableProxy(Factory::this_symbol(), true, false);
+    proxy->BindTo(receiver_);
+    return proxy;
+  }
 
   // The variable holding the function literal for named function
   // literals, or NULL.
@@ -314,7 +319,7 @@ class Scope: public ZoneObject {
   // Declarations.
   ZoneList<Declaration*> decls_;
   // Convenience variable.
-  VariableProxy* receiver_;
+  Variable* receiver_;
   // Function variable, if any; function scopes only.
   Variable* function_;
   // Convenience variable; function scopes only.