public function visitStaticField(O\StaticFieldExpression $expression)
{
$classExpression = $expression->getClass();
$this->walk($classExpression);
$this->walk($expression->getName());
$class = $this->validateStaticClassName($classExpression, 'static field');
$this->addTypeOperation($expression, $this->typeSystem->getObjectType($class)->getStaticField($expression));
}