Cannot check the interceptor since it may not be ready yet.

src/runtime.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdlib.h>
 #include <limits>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 5319 matching lines @@
   CONVERT_SMI_ARG_CHECKED(unchecked_attributes, 3);
   RUNTIME_ASSERT(
       (unchecked_attributes & ~(READ_ONLY | DONT_ENUM | DONT_DELETE)) == 0);
   // Compute attributes.
   PropertyAttributes attributes =
       static_cast<PropertyAttributes>(unchecked_attributes);
 
 #ifdef DEBUG
   if (key->IsName()) {
     LookupIterator it(object, Handle<Name>::cast(key),
-                      LookupIterator::CHECK_OWN);
+                      LookupIterator::CHECK_OWN_REAL);
     JSReceiver::GetPropertyAttributes(&it);
     RUNTIME_ASSERT(!it.IsFound());
   } else {
     uint32_t index = 0;
     RUNTIME_ASSERT(key->ToArrayIndex(&index));
     RUNTIME_ASSERT(!JSReceiver::HasOwnElement(object, index));
   }
 #endif
 
   Handle<Object> result;
@@ skipping 9731 matching lines @@
   }
   return NULL;
 }
 
 
 const Runtime::Function* Runtime::FunctionForId(Runtime::FunctionId id) {
   return &(kIntrinsicFunctions[static_cast<int>(id)]);
 }
 
 } }  // namespace v8::internal