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@ 2014-07-03T07:27:49Z

<?hh

class x
{
	public function content(?string $content = null) :(this, string)
    {
        if ($content) return $this->setContent($content);
        return $this->content;
    }

    public function setContent($x)
    {
		$this->content = $x;
    }
}

$x = new x;
$x->content('waa');

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This is an error 404