“丢失[super dealloc]”在ARC工程中的警告

I've refactored a project to ARC. It looks fine, but there is an object which uses the notification center. I removed the observer in a custom dealloc method. That worked fine in the non ARC project. It also works in ARC, but I get a crazy warning: "Method possibly missing a [super dealloc] call." In an ARC project it is automatically done for me, when the method ends. Even better: I must not call it in ARC projects! This must be an XCode bug, right? Here's my code:I've refactored a project to ARC. It looks fine