Description:
------------
\Closure::call allows full access to private properties when the closure contains $this->...

Test script:
---------------
<?php
class A {
        private $C = 1;
        private function B() {
                return "B";
        }
}

$a = new A;

$b = function() {
        return $this->B();
};

$c = function() {
        $this->C = 2;
};

var_dump($b->call($a));
$c->call($a);
var_dump($a);
?>


Expected result:
----------------
PHP Fatal error:  Uncaught Error: Call to private method A::B() from context '' in /tmp/test.php:22

Actual result:
--------------
string(1) "B"
object(A)#1 (1) {
  ["C":"A":private]=>
  int(2)
}