struct Adder {
    var base: Int

    func callAsFunction(x: Int, y: Int) -> Int {
        return base + x + y
    }
}

let /*test:def*/<base>add3</base> = Adder(base: 3)
/*test:ref*/<base>add3</base>(x: 10, y: 11)
let blah = /*test:ref*/<base>add3</base>.callAsFunction(x:y:)