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@ 2014-05-25T18:49:14Z

<?hh

interface StringConverter {

	public function toUpperCase(string $str) : string;

}

class Test implements StringConverter {

    public function toUpperCase(string $str) : string {
		return strtoupper($str);
    }

}

$t = new Test;
var_dump($t->toUpperCase('re4k'));

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