enum Foo {
    case north, south, east, west
    case foo(Int), bar(Int)
    case  foo(Int)
    case foo = 1

    func foo() {
        switch self {
        case .foo:
        case .foo(let x):
        case let .foo(x):
        case foo:
        case let x:
        default:
        }
    }

    func foo() {
        foo()
        foo
        foo {
        }

        if foo.bar {
        }

        a.b.c()
        a.b.c.d()

        a . foo
        a
          .b
          .c
          .d()
        a.?b.?c()
    }
}