[swift-evolution] Proposal Sketch: simplify optional unwrapping syntax

[Kyle Carson via swift-evolution]

I've got another solution.  It's simple and very "swift".  The code "var != 
nil" can be used as a hint to the compiler that *var* is not an optional.

Code example:

let color : Color? = getFavoriteColor()
if color != nil {
        // Color is no longer an Optional
}

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