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<?php declare(strict_types=1); function foo(int $x, ?int &$y = null) { var_dump(isset($y)); if ($y != null) { $y = $x ** 2; } return $x * 2; } var_dump([foo(5, $a), $a]);
Output for git.master_jit, git.master
bool(false) array(2) { [0]=> int(10) [1]=> NULL }

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