SE-0380: `if` and `switch` expressions

Evolution Proposal Reviews
55

Thanks for doing the analysis. I was actually teetering on the brink of agreeing maybe allowing return wasn't such a good idea and we could drop that part – and this post pulled me back to thinking it's a good idea.

Another reason is, there's a particular form in Swift that would benefit from return... failable initializers. Which are often of the form "either assign something to self, or return nil from this function", e.g.

    init?(rawValue: String) {
        self = switch rawValue {
        case "foo": 1
        case "bar": 2
        case "baz": 3
        default: return nil
        }
    }

It'd be a shame to require them to lose the benefit of this proposal.

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