Description:
------------
Methods dynamically created by assigning a closure to a property of $this cannot be called directly, but must instead by assigned to a variable first.

Test script:
---------------
class O {
  public $f;

  function __construct() {
    $this->f = function() {
      echo "Dynamic method\n";
    };
  }
}

$o = new O();
$f = $o->f;
$f();
$o->f();


Expected result:
----------------
Dynamic method
Dynamic method

Actual result:
--------------
Dynamic method
Fatal error:  Call to undefined method O::f()