[swift-evolution] Proposal: Initialization should not be required in precondition(false) case.

[David Turnbull]

Use preconditionFailure() instead of precondition(false).

-david

On Fri, Feb 12, 2016 at 7:59 AM, Amir Michail via swift-evolution <
swift-evolution at swift.org> wrote:

> For example:
>
> let x:Int
> if … { x = 1 }
> else if … { x = 2 }
> else { precondition(false) } // no initialization needed
>
> Similarly,
>
> let x:Int
> switch ... {
> case …: x = 1
> case …: x = 2
> default: precondition(false) // no initialization needed
> }
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