7 files declare their use of GroupSequence in Plug 7

Abstract2Dot5ApiTest.php in lib/Symfony/validator/Symfony/Component/Validator/Tests/Validator/Abstract2Dot5ApiTest.php

AbstractValidatorTest.php in lib/Symfony/validator/Symfony/Component/Validator/Tests/Validator/AbstractValidatorTest.php

AnnotationLoader.php in lib/Symfony/validator/Symfony/Component/Validator/Mapping/Loader/AnnotationLoader.php

ClassMetadata.php in lib/Symfony/validator/Symfony/Component/Validator/Mapping/ClassMetadata.php

GroupSequenceTest.php in lib/Symfony/validator/Symfony/Component/Validator/Tests/Constraints/GroupSequenceTest.php

LegacyValidator.php in lib/Symfony/validator/Symfony/Component/Validator/Validator/LegacyValidator.php

RecursiveContextualValidator.php in lib/Symfony/validator/Symfony/Component/Validator/Validator/RecursiveContextualValidator.php