Use return value of GetPropertyAttributes to make compiler happy.

src/objects.cc

 // Copyright 2013 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 "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/allocation-site-scopes.h"
 #include "src/api.h"
 #include "src/arguments.h"
@@ skipping 4075 matching lines @@
 
 
 void JSObject::AddProperty(Handle<JSObject> object, Handle<Name> name,
                            Handle<Object> value,
                            PropertyAttributes attributes) {
 #ifdef DEBUG
   uint32_t index;
   ASSERT(!object->IsJSProxy());
   ASSERT(!name->AsArrayIndex(&index));
   LookupIterator it(object, name, LookupIterator::CHECK_OWN_REAL);
-  GetPropertyAttributes(&it);
+  Maybe<PropertyAttributes> maybe = GetPropertyAttributes(&it);
+  ASSERT(maybe.has_value);
   ASSERT(!it.IsFound());
   ASSERT(object->map()->is_extensible());
 #endif
   SetOwnPropertyIgnoreAttributes(object, name, value, attributes,
                                  OMIT_EXTENSIBILITY_CHECK).Check();
 }
 
 
 // Reconfigures a property to a data property with attributes, even if it is not
 // reconfigurable.
@@ skipping 12856 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal