[swift-evolution] Disallowing unreachable code

Alex Blewitt alblue at apple.com
Wed Mar 29 08:15:52 CDT 2017

> On 29 Mar 2017, at 14:10, Jonathan Hull <jhull at gbis.com> wrote:
> I think the idea is that it also adds a warning so you can find it later.

@available(*, deprecated, message: "Don't forget to implement this")
func unimplemented<T>(_ file:String = #file,_ line:Int = #line) -> T {
  fatalError("Not implemented \(file):\(line)")

let f: String = unimplemented()

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