[swift-evolution] [Discussion]: Deprecate !-Unwrapping of Optionals

[davesweeris at mac.com]

> On Feb 29, 2016, at 2:24 PM, Developer via swift-evolution <swift-evolution at swift.org> wrote:
> 
> And for those cases there will be a standard library function or something more obvious than bang to make up for the deprecated operator.  Force unwrapping will not go away (that's a terribly unproductive idea), but the goal is to make a dangerous operation more obvious[ly dangerous].  

Like this?
enum OptionalUnwrappingError : ErrorType {
    case unexpectedlyFoundNil
}
enum Optional<T> {
    typealias Wrapped = T
    case None
    case Some(Wrapped)
    ...
    func unwrap() throws -> Wrapped {
        switch self {
        case .None: throw OptionalError.unexpectedlyFoundNil
        case .Some(let value): return value
        }
    }
}

It’s hard to get more obvious than the compiler complaining that you haven’t wrapped a throwing function in a try block

- Dave Sweeris
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