Swift subscript overloading and vargs

gistfile1.swift

class Foo {
    subscript(idxs: Int...) -> Int {
        get {
            return idxs.reduce(1, combine: *)
        }
    }
    subscript(idxs: Array<Int>) -> Int {
        get {
            return idxs.reduce(1, combine: *)
        }
    }
}

let a = Foo(), list = [1, 2, 5]

a[list]  // => 10
a[1,2,3] // => 6