Swift compilation issue that took some of my time today. Solution: https://gist.github.com/cdzombak/431cea0a4c0ced8042a5

Router.swift

public class Router : NSObject {
    typealias VCPushBlock = (UIViewController) -> (Void)

    init(context: NSManagedObjectContext, pushBlock: VCPushBlock) {
        // ...
    }

    convenience init(context: NSManagedObjectContext, owningViewController: UIViewController) {
        self.init(context: context, pushBlock: {
            owningViewController.navigationController?.pushViewController($0, animated: true)
            // compiler error on previous line: Could not find an overload for 'init' that accepts the supplied arguments
        })
    }

    // ...
}

This turned out to be because Void != Void?. See the solution.