Crash Xcode 7.3 b2

crash-xcode7.3-b2.swift

import UIKit

public class BaseCellT<BubbleViewType where BubbleViewType:UIView>: UICollectionViewCell {

    override init(frame: CGRect) {
        super.init(frame: frame)
        self.bubbleView = self.createBubbleView()
    }

    public private(set) var bubbleView: BubbleViewType!
    func createBubbleView() -> BubbleViewType! {
        assert(false, "Override in subclass")
        return nil
    }

}

public final class PhotoCell: BaseCellT<UIImageView> {
    override init(frame: CGRect) {
        super.init(frame: frame)
    }

    override func createBubbleView() -> UIImageView! {
        return UIImageView()
    }
}

public final class TextCell: BaseCellT<UIView> {
    override init(frame: CGRect) {
        super.init(frame: frame)
    }

    override func createBubbleView() -> UIView! {
        return UIView()
    }
}

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        let photoCell = PhotoCell(frame: CGRect.zero)
        let textCell = TextCell(frame: CGRect.zero)
        print(photoCell)
        print(textCell)
    }
}

Random EXC_BAD_ACCESS