optional enum switch compiler issue

switch.swift

enum MyEnum {
  case Case1, Case2
}

let myEnum: MyEnum? = .Case1

// Implicit optional unwrapping

// These first two case statements fail to compile:
//
// switch myEnum {
// case MyEnum.Case1: break
// case .Case2: break
// case nil: break
// }

// Explicit optional unwrapping

switch myEnum {
case .Some(MyEnum.Case1): break
case .Some(.Case2): break
case nil: break
}

// Force optional unwrapping

switch myEnum! {
case MyEnum.Case1: break
case .Case2: break
// case nil: break <- commented out because no longer relevant
}