enum Foo {
    case zero
    case one(String)
    case two(String)
}


let foo = Foo.one("hello")

switch foo {
case .zero:
    print("hello")
case .one(let hello), .two(let hello):
    print(hello) // (lldb) po hello
                 // error: <EXPR>:3:1: error: use of unresolved identifier 'hello'
                 // hello
                 // ^~~~~
}