Test of fatalError() backed by @NoReturn (Swift2) vs. Never (Swift3)

fatalErrorTest.swift

// This compiles in both Swift 2 and 3
func test1() -> Int {
    fatalError()
}

// This compiled in Swift2 but no longer does in Swift 3
let test2 : () -> Int = {
    fatalError()
}

// Compiles in Swift 3
let test2 : () -> Int = {
    if false { return 0 }
    fatalError()
}