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<?hh interface Foo { public function foo(String $foo) : String; } class Bar implements Foo { public function foo(String $foo) : StdClass { return new StdClass; } } $b = new Bar; var_dump($b->foo("test"));
Output for hhvm-3.12.0
object(stdClass)#2 (0) { }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.34 - 5.4.35
Parse error: syntax error, unexpected 'interface' (T_INTERFACE) in /in/3eYTQ on line 3
Process exited with code 255.
Output for 5.3.0 - 5.4.32
<?hh interface Foo { public function foo(String $foo) : String; } class Bar implements Foo { public function foo(String $foo) : StdClass { return new StdClass; } } $b = new Bar; var_dump($b->foo("test"));