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@ 2014-05-13T17:20:21Z

<?hh

interface Foo {
    public function foo(String $foo) : String;
}

class Bar implements Foo {
    public function foo(String $foo) {
        return new StdClass;
    }
}

$b = new Bar;

var_dump(  $b->foo("test") . "1");

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This is an error 404