php-8.0.30-src/Zend/tests/nullsafe_operator/031.phpt

--TEST--
Nullsafe operator on referenced value
--FILE--
<?php

$val = null;
$ref =& $val;
var_dump($ref?->foo);

$val = new stdClass;
var_dump($ref?->foo);

?>
--EXPECTF--
NULL

Warning: Undefined property: stdClass::$foo in %s on line %d
NULL