Description:
------------
Call a private static function in a subclass, and it failed in 5.5.
However it runs normally in php 5.4

Test script:
---------------
<?php
class A {

    private static function testprivate() {
        return 1;
    }
    public static function test() {
        return function() {
            return self::testprivate();
        };
    }
}

class B extends A {
}

$fn = B::test();
echo $fn();

Expected result:
----------------
1

Actual result:
--------------
Fatal error: Call to private method A::testprivate() from context 'B' in /tmp/test.php on line 9

Call Stack:
    0.0048     645824   1. {main}() /tmp/test.php:0
    0.0048     646304   2. B::{closure:/tmp/test.php:8-10}() /tmp/test.php:18