Generic factory

gistfile1.swift

import UIKit

class Foo {
    let xx: Int
    required init(x: Int) {        // Remove 'required' to see the factory fail.
        self.xx = x
    }
}

class Bar: Foo {
    var yy: Int = 1
}

func construct<T: Foo>(x: Int, t: T.Type) -> T {
    return T(x: x)
}

var bar = construct(12, Bar.self)
bar is Bar                  // Unexpectedly false.
println("Yes!")
bar.yy = 9                  // Fails on this line.
println("No!")              // Never runs.