9 files declare their use of ExecutionContextInterface in Plug 7

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

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

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

CallbackClass.php in lib/Symfony/validator/Symfony/Component/Validator/Tests/Fixtures/CallbackClass.php

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

ConstraintAValidator.php in lib/Symfony/validator/Symfony/Component/Validator/Tests/Fixtures/ConstraintAValidator.php

Entity.php in lib/Symfony/validator/Symfony/Component/Validator/Tests/Fixtures/Entity.php

ExecutionContextInterface.php in lib/Symfony/validator/Symfony/Component/Validator/Context/ExecutionContextInterface.php

LegacyConstraintViolationBuilder.php in lib/Symfony/validator/Symfony/Component/Validator/Violation/LegacyConstraintViolationBuilder.php