silexphp/Silex — pull request #933 by shostelet (2014-03-31 14:56:41+00:00)
Title: Allow extends of SessionServiceProvider with access to Silex\Application...

I wanted to extend SessionServiceProvider. Attribute $app is private, so you have to re-declare it as protected in the extending class, which is not really neat.
Changing attribute to protected in Silex\Provider\SessionServiceProvider does the trick and avoid to declare it again