Uncaught exception 'ReflectionException' in master

[BenTyger]

Getting this error when I executed the the follwing command. This from the master branch (96d38e6) ;

vendor/bin/phpcs --standard=PHPCompatibility --extensions=php --ignore='testers' --runtime-set testVersion 5.3-5.5 ~/workspaces/ggva/5.4/GGVA_API-5.4/lib/
PHP Fatal error: Uncaught exception 'ReflectionException' with message 'Class php-compatibility_Sniffs_PHP_ForbiddenBreakContinueVariableArgumentsSniff does not exist' in /home/likewise-open/GRIDDATA/btyger/workspaces/ggva/5.4/GGVA_API-5.4/testers/vendor/squizlabs/php_codesniffer/CodeSniffer.php:1335

Environment:
composer 1.0.0
phpunit/php-code-coverage 1.2.18 Library that provides collection, processing, and rendering functionality for PHP code coverage information.
phpunit/php-file-iterator 1.4.1 FilterIterator implementation that filters files based on a list of suffixes.
phpunit/php-text-template 1.2.1 Simple template engine.
phpunit/php-timer 1.0.7 Utility class for timing
phpunit/php-token-stream 1.2.2 Wrapper around PHP's tokenizer extension.
phpunit/phpunit 3.7.38 The PHP Unit Testing framework.
phpunit/phpunit-mock-objects 1.2.3 Mock Object library for PHPUnit
simplyadmire/composer-plugins 2.0.1 Composer plugin for installing PHP_CodeSniffer standards
squizlabs/php_codesniffer 2.3.4 PHP_CodeSniffer tokenizes PHP, JavaScript and CSS files and detects violations of a defined set of coding standards.
symfony/yaml v2.8.6 Symfony Yaml Component
wimg/php-compatibility dev-master 96d38e6 This is a set of sniffs for PHP_CodeSniffer that checks for PHP version compatibility.

[wimg]

Are you certain the CodeSniffer.php file is actually the 2.3.4 that you install through Composer ? Sometimes PHP plays a trick and loads a different version.