I think the idea is that it also adds a warning so you can find it later.
> On Mar 29, 2017, at 6:06 AM, Alex Blewitt <[email protected]> wrote: > > On 29 Mar 2017, at 11:38, Jonathan Hull via swift-evolution > <[email protected] <mailto:[email protected]>> wrote: >> >> >>> On Mar 27, 2017, at 11:27 AM, John McCall via swift-evolution >>> <[email protected] <mailto:[email protected]>> wrote: >>> >>> In fact, we should probably double-down on this design and add an >>> "unimplemented" expression that always triggers warnings and just traps if >>> you try to evaluate it. That expression would be a logical thing to use in >>> e.g. code snippets automatically inserted by an IDE. >> >> Yes, please. > > > You can do this already: > > func unimplemented<T>(_ file:String = #file,_ line:Int = #line) -> T { > fatalError("Not implemented \(file):\(line)") > } > > let f: String = unimplemented() > >
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