{ return array('key' => true); } public function HHVMVoid() : void { return; } public function HHVMMixed() : mixed { return null; } public function HHVMThis() : this { return $this; } public function HHVMString() : string { return 'a string'; } public function HHVMImmVector() : ImmVector { return new ImmVector([1, 2, 3]); } }