hhvm/hphp/test/quick/clone.php.expect

object(A)#2 (2) {
  ["x"]=>
  int(2)
  ["y"]=>
  string(3) "foo"
}
object(C)#3 (1) {
  ["thing"]=>
  int(10)
}
object(C)#3 (1) {
  ["thing"]=>
  int(10)
}