An Extensible Goto framework for Swift

Goto.swift

struct Goto {
    typealias Closure = () -> ()
    var closures = [String: Closure]()
    func to(label: String) {
        guard let closure = closures[label] else {
            fatalError("Unknown label: \(label)")
        }
        closure()
    }
    mutating func set(label: String, closure: () -> ()) {
        closures[label] = closure
    }
}

var go = Goto()
var val = 0
go.set("cond") {
    go.to(val > 10 ? "end" : "body")
}
go.set("body") {
    print(val)
    val += 1
    go.to("cond")
}
go.set("end") {}

go.to("cond")