[swift-evolution] Proposal: Add "none" and simplify the language.

[Félix Cloutier]

An implicitly-unwrapped optional would do almost that, no?

Félix

> Le 7 janv. 2016 à 12:46:53, Amir Michail via swift-evolution <swift-evolution at swift.org> a écrit :
> 
> Examples:
> 
> var x:Int = none // uninitialized but not an optional
> 
> print(x) // run-time error as x is uninitialized
> 
> if x == nil { … } // compile time error… x can never be nil because it is not an optional
> 
> if x == none { x = 2 } // … but it can be uninitialized
> 
> Optionals can also be uninitialized:
> 
> var y:Int? = none // uninitialized and an optional
> 
> if y == nil { … } // run-time error as y is uninitialized
> 
> y = nil
> 
> if y == nil { … } // fine
> 
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