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<?php
/**
* Always none
* User: moyo
* Date: 2018-11-26
* Time: 15:47
*/
namespace Carno\Traced\Protocol;
use Carno\Tracing\Contracts\Protocol;
use Carno\Tracing\Standard\Span;
class AlwaysNone implements Protocol
{
* @param Span $span
* @return string
public function serialize(Span $span) : string
return '';
}