gistfile1.txt

<?hh

class MyClass {
  public function __construct() {
    var_dump(__FUNCTION__);
  }
  public function foo() {
    var_dump(spl_object_hash($this));
  }
}

function main() {
  $proxy = () ==> {static $it = null; $it = $it ?: new MyClass(); return $it;};

  var_dump('made proxy');
  $proxy()->foo();
  $proxy()->foo();
}

main();

string(10) "made proxy"
string(11) "__construct"
string(32) "0000000000000000af7d8023c4ffef5b"
string(32) "0000000000000000af7d8023c4ffef5b"

Identical hash shows it's the same object