Description:
------------
Property is declared twice, see below..

Reproduce code:
---------------
<?php

abstract class Base {

        private $var;

        function __construct()
        {
            $this->initAttributes();
            $this->doit();
        }

        final private function initAttributes( )
        {
                $this->var = false;
        }

        abstract protected function doit();


}

class Ext extends Base {

        protected function doit()
        {
          $this->var = 1;
        }

}

class Bla {

        static private $instance = false;

        static function instance() {
                Bla::$instance = new Ext();
                return Bla::$instance;
        }

}

$bla = Bla::instance();
var_dump($bla);
?>

Expected result:
----------------
object(Ext)#1 (2) {
  ["var:private"]=>
  int(1)
}


Actual result:
--------------
object(Ext)#1 (2) {
  ["var:private"]=>
  bool(false)
  ["var"]=>
  int(1)
}