Hi, is there a way to try/catch an `IncorrectDeref...

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[Sebastian Keller]

Hi, is there a way to try/catch an IncorrectDereferenceException? I want to use the iOS CMAltimeter class, but it's callback gets called from a non-main-thread when altimeter?.stopRelativeAltitudeUpdates() is called. I tried a surrounding try and catch, but no luck. I can not freeze the callback, because that would freeze update() too. I really don't know what else to do right now.

altimeter = CMAltimeter()
            altimeter?.startRelativeAltitudeUpdatesToQueue(NSOperationQueue.mainQueue) { data: CMAltitudeData?, error: NSError? ->
                update(data.pressure.doubleValue)
            }

Can the relaxed mode help? If so, how to enable it?
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