gistfile1.txt

enum Bar: String {
    case a, b, c
    init?(w: Bool, x: Bool, y: Bool, z: Bool) {
        if w {
            if x {
                self = .a
                return
            } else if y {
                self = .b
                return
            }
            //fall through
        }
        if z {
            self = .c
            return
        }
        return nil
    }
}

enum Foo: String {
    case a, b, c
    init?(w: Bool, x: Bool, y: Bool, z: Bool) {
        switch (w, x, y, z) {
        case (true, true, _, _):
            self = .a
        case (true, false, true, _):
            self = .b
        case (_, _, _, true):
            self = .c
        default:
            return nil
        }
    }
}

let f0 = Foo(w: false, x: false, y: false, z: false)
let f1 = Foo(w: false, x: false, y: false, z: true)
let f2 = Foo(w: false, x: false, y: true, z: false)
let f3 = Foo(w: false, x: false, y: true, z: true)
let f4 = Foo(w: false, x: true, y: false, z: false)
let f5 = Foo(w: false, x: true, y: false, z: true)
let f6 = Foo(w: false, x: true, y: true, z: false)
let f7 = Foo(w: false, x: true, y: true, z: true)
let f8 = Foo(w: true, x: false, y: false, z: false)
let f9 = Foo(w: true, x: false, y: false, z: true)
let fa = Foo(w: true, x: false, y: true, z: false)
let fb = Foo(w: true, x: false, y: true, z: true)
let fc = Foo(w: true, x: true, y: false, z: false)
let fd = Foo(w: true, x: true, y: false, z: true)
let fe = Foo(w: true, x: true, y: true, z: false)
let ff = Foo(w: true, x: true, y: true, z: true)

let b0 = Bar(w: false, x: false, y: false, z: false)
let b1 = Bar(w: false, x: false, y: false, z: true)
let b2 = Bar(w: false, x: false, y: true, z: false)
let b3 = Bar(w: false, x: false, y: true, z: true)
let b4 = Bar(w: false, x: true, y: false, z: false)
let b5 = Bar(w: false, x: true, y: false, z: true)
let b6 = Bar(w: false, x: true, y: true, z: false)
let b7 = Bar(w: false, x: true, y: true, z: true)
let b8 = Bar(w: true, x: false, y: false, z: false)
let b9 = Bar(w: true, x: false, y: false, z: true)
let ba = Bar(w: true, x: false, y: true, z: false)
let bb = Bar(w: true, x: false, y: true, z: true)
let bc = Bar(w: true, x: true, y: false, z: false)
let bd = Bar(w: true, x: true, y: false, z: true)
let be = Bar(w: true, x: true, y: true, z: false)
let bf = Bar(w: true, x: true, y: true, z: true)

f0?.rawValue == b0?.rawValue
f1?.rawValue == b1?.rawValue
f2?.rawValue == b2?.rawValue
f3?.rawValue == b3?.rawValue
f4?.rawValue == b4?.rawValue
f5?.rawValue == b5?.rawValue
f6?.rawValue == b6?.rawValue
f7?.rawValue == b7?.rawValue
f8?.rawValue == b8?.rawValue
f9?.rawValue == b9?.rawValue
fa?.rawValue == ba?.rawValue
fb?.rawValue == bb?.rawValue
fc?.rawValue == bc?.rawValue
fd?.rawValue == bd?.rawValue
fe?.rawValue == be?.rawValue
ff?.rawValue == bf?.rawValue