private function compareStaticModifier()
{
$baseIsStatic = $this->base->isStatic();
$challengerIsStatic = $this->challenger->isStatic();
if ($baseIsStatic !== $challengerIsStatic) {
$message = $baseIsStatic ? 'method is no longer static' : 'method has become static';
$difference = new Difference($message);
$this->populateDifference($difference);
if (!$baseIsStatic && 'private' !== $this->base->getVisibility()) {
$difference->addTag(Difference::BC_BREAK);
}
$this->differences->add($difference);
}
}
