Description:
------------
https://3v4l.org/sSUph

Test script:
---------------
trait TTT{
    private function baz(){}
}

class AAA{
    use TTT;
}

class BBB extends AAA{}

$RC = new ReflectionClass(BBB::CLASS);
var_dump($RC->getMethods(ReflectionMethod::IS_PRIVATE));
// lists TTT::baz