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

src/scopes.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 188 matching lines @@
   bool inside_with() const  { return scope_inside_with_; }
   // Does this scope contain a with statement.
   bool contains_with() const  { return scope_contains_with_; }
 
   // The scope immediately surrounding this scope, or NULL.
   Scope* outer_scope() const  { return outer_scope_; }
 
   // ---------------------------------------------------------------------------
   // 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.
   // Only valid for function scopes.
   Variable* function() const  {
     ASSERT(is_function_scope());
     return function_;
   }
 
   // Parameters. The left-most parameter has index 0.
@@ skipping 86 matching lines @@
   ZoneList<Variable*> temps_;
   // Parameter list in source order.
   ZoneList<Variable*> params_;
   // Variables that must be looked up dynamically.
   DynamicScopePart* dynamics_;
   // Unresolved variables referred to from this scope.
   ZoneList<VariableProxy*> unresolved_;
   // Declarations.
   ZoneList<Declaration*> decls_;
   // Convenience variable.
-  VariableProxy* receiver_;
+  Variable* receiver_;
   // Function variable, if any; function scopes only.
   Variable* function_;
   // Convenience variable; function scopes only.
   VariableProxy* arguments_;
   // Convenience variable; function scopes only.
   VariableProxy* arguments_shadow_;
 
   // Illegal redeclaration.
   Expression* illegal_redecl_;
 
@@ skipping 59 matching lines @@
   virtual VariableProxy* NewUnresolved(Handle<String> name, bool inside_with) {
     return NULL;
   }
   virtual VariableProxy* NewTemporary(Handle<String> name)  { return NULL; }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCOPES_H_