[swift-evolution] Proposal: Pattern Matching Partial Function (#111)

[Charles Constant]

@Paul

On the more objective side of things, there is also the fact that, as the
proposal states, it's nice to have protection against this happening:

    let str: String
    switch(state) {
        case .Cold: str = "Too cold"; self.freezer.stop()
        case .Hot:  str = "Too hot"
        default:    str = "Just right"
    }
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