It is for a XenForo View Class and i'm using XFCP.
Let's take XenForo_ControllerPublic_Warning::actionIndex as example
It's using the view XenForo_ViewPublic_Warning_Info which doesn't exist.
That's why i created my own View implementing parent::renderHtml and extending from XenForo_ViewPublic_Warning_Info via the XenForo Proxyclass System.
It's working fine.
If there would be now another addon, which is also extending from XenForo_ViewPublic_Warning_Info and implementing renderHtml one of the both wouldn't run because you can't just run parent::renderHtml() because there's no parent method in the fake class, so you NEED to run it, but if only 1 addon is installed, you'll get an fatal error because parent::renderHtml isn't declared.