Things go wrong in Swift 2.1

things-go-wrong-in-swift-2.1.swift

/// # Things go wrong in Swift 2.1

/// ## A protocol overriding/giving default implementation to its parent's methods
/// If you have a class conform to this protocol and try compile, you will get segmentation fault 11.
protocol SingleSectionTableViewDataSource: UITableViewDataSource {
    typealias ItemType

    var items: [ItemType] { get set }
}

extension SingleSectionTableViewDataSource {
    func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 1
    }

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return items.count
    }
}