infra: enable printing diff to monitor what is going on in Checker
infra: enable printing diff to monitor what is going on in Checker

checkstyle/checkstyle,checkstyle/checkstyle,romani/checkstyle,romani/checkstyle,romani/checkstyle,checkstyle/checkstyle,checkstyle/checkstyle,checkstyle/checkstyle,checkstyle/checkstyle,romani/checkstyle,romani/checkstyle,romani/checkstyle