7 files declare their use of GroupSequence in Zircon Profile 8

Abstract2Dot5ApiTest.php in vendor/symfony/validator/Tests/Validator/Abstract2Dot5ApiTest.php

AbstractValidatorTest.php in vendor/symfony/validator/Tests/Validator/AbstractValidatorTest.php

AnnotationLoader.php in vendor/symfony/validator/Mapping/Loader/AnnotationLoader.php

ClassMetadata.php in vendor/symfony/validator/Mapping/ClassMetadata.php

GroupSequenceTest.php in vendor/symfony/validator/Tests/Constraints/GroupSequenceTest.php

RecursiveContextualValidator.php in vendor/symfony/validator/Validator/RecursiveContextualValidator.php

RecursiveValidator.php in vendor/symfony/validator/Validator/RecursiveValidator.php