Do not put failures in handles....

src/handles-inl.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 18 matching lines @@
 #ifndef V8_HANDLES_INL_H_
 #define V8_HANDLES_INL_H_
 
 #include "handles.h"
 #include "api.h"
 
 namespace v8 { namespace internal {
 
 template<class T>
 Handle<T>::Handle(T* obj) {
+  ASSERT(!obj->IsFailure());
   location_ = reinterpret_cast<T**>(HandleScope::CreateHandle(obj));
 }
 
 
 template <class T>
 inline T* Handle<T>::operator*() const {
   ASSERT(location_ != NULL);
   ASSERT(reinterpret_cast<Address>(*location_) != kHandleZapValue);
   return *location_;
 }
@@ skipping 15 matching lines @@
   // Restore state in current handle scope to re-enable handle
   // allocations.
   ImplementationUtilities::CurrentHandleScope()->extensions = extensions_;
 }
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HANDLES_INL_H_