PHP_CodeSniffer does not find sniffs in PHP 7

[oliverklee]

With PHP 7, PHP_CodeSniffer to not find the sniffs from TYPO3SniffPool anymore:

https://travis-ci.org/oliverklee/sniffer-demo

This is the demo project I've used:
https://github.com/oliverklee/sniffer-demo

This only happens with PHP 7, not with PHP 5.5, 5.6 or HHVM.

Only the TYPO3SniffPool sniffs are affected, not the sniffs that come bundled with PHP_CodeSniffer.

[oliverklee]

On my local development machine, this problem also occurs with PHP 5.512.