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<?hh interface Foo { public function foo(String $foo) : String; } class Bar implements Foo { public function foo($foo) { return new StdClass; } } $b = new Bar; var_dump($b->foo(new DateTime()));
Output for git.master, git.master_jit, rfc.property-hooks
<?hh interface Foo { public function foo(String $foo) : String; } class Bar implements Foo { public function foo($foo) { return new StdClass; } } $b = new Bar; var_dump($b->foo(new DateTime()));

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