Silent warnings.

src/scopes.cc

 // Copyright 2012 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 1360 matching lines @@
         JSReceiver::SetProperty(
             instance, it.name(), value, ro_attr, kStrictMode);
       } else {
         Variable* var = LocalLookup(it.name());
         ASSERT(var != NULL && var->IsContextSlot());
         PropertyAttributes attr = var->is_const_mode() ? ro_attr : rw_attr;
         Handle<AccessorInfo> info =
             Accessors::MakeModuleExport(it.name(), var->index(), attr);
         Handle<Object> result = SetAccessor(instance, info);
         ASSERT(!(result.is_null() || result->IsUndefined()));
+        USE(result);
       }
     }
     USE(JSObject::PreventExtensions(instance));
   }
 
   // Link nested modules.
   for (int i = 0; i < inner_scopes_.length(); i++) {
     Scope* inner_scope = inner_scopes_.at(i);
     if (inner_scope->is_module_scope()) {
       inner_scope->LinkModules(info);
     }
   }
 }
 
 
 } }  // namespace v8::internal