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namespace Symfony\Component\Validator\Constraints\Collection;
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trigger_error('The '.__NAMESPACE__.'\Optional class is deprecated since version 2.3 and will be removed in 3.0. Use the Symfony\Component\Validator\Constraints\Optional class instead.', E_USER_DEPRECATED);
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@trigger_error('The '.__NAMESPACE__.'\Optional class is deprecated since version 2.3 and will be removed in 3.0. Use the Symfony\Component\Validator\Constraints\Optional class instead.', E_USER_DEPRECATED);
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use Symfony\Component\Validator\Constraints\Optional as BaseOptional;