[swift-evolution] Idea: change "@noreturn func f()" to "func f() noreturn"

[Joe Groff]

> On Feb 25, 2016, at 2:43 PM, Radosław Pietruszewski <radexpl at gmail.com> wrote:
> 
>> On 25 Feb 2016, at 23:40, Joe Groff <jgroff at apple.com> wrote:
>> 
>> 
>>> On Feb 25, 2016, at 2:40 PM, Radosław Pietruszewski <radexpl at gmail.com> wrote:
>>> 
>>> Ah, that’s a neat idea! Not sure it’s an improvement though to have a magic type that changes how the compiler treats your method, rather than a rather explicit *attribute* on the method…
>> 
>> There's no magic. If you can't construct a value of your return type, you can't return.
>> 
>> -Joe
> 
> 
> The magic is somewhere else. Calling a @noreturn function allows you to do things you can’t otherwise do:
> 
> func foo() -> Int {
> 	fatalError()
> }

I see. The unreachable code check arguably ought to also accept this if fatalError returns any uninhabited type, since it'll never be able return if that's the case.

-Joe