New in Xcode 9,  has fixed this bug I filed last February

gistfile1.swift

// Up until Xcode 8.3.2
// switching over a type's static properties required full namespace qualification
// This wouldn't compile
// Fixed in Xcode 9 :D

extension String {
    static let firstSection: String = "firstSection"
    static let secondSection: String = "secondSection"
}

let message: String = .firstSection

switch message {
case .firstSection:
    print("First")
case .secondSection:
    print("Second")
default:
    print("Default")
}