[swift-evolution] ternary operator ?: suggestion

[Charles Constant]

> In the case where your input is hashable, you could just do:
>
> let i = [.Red:0xff0000, .Green:0x00ff00, .Blue:0x0000ff][color]

Mea culpa: you were correct, this actually *does* work in a Playground, as
long as you access it when you construct it.

I didn't realize Swift was smart enough to infer a one-off Dict by its key.
Thanks Lattner & co! That is extremely cool :)

So that just leaves the fact that the Keys need to be hashable / not
optional.
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