[swift-evolution] Allow let binding of non-optionals

[Joe Groff]

> On Jan 7, 2016, at 10:59 AM, Jacob Bandes-Storch via swift-evolution <swift-evolution at swift.org> wrote:
> 
>         do let value2 = somethingNonOptional()
> 

'case let' already works like this, by declaring a pattern 'let a' that unconditionally matches anything.

-Joe
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