Pitch: Multi-statement if/switch/do expressions

Evolution Pitches
473

If I understand this pitch correctly, it would allow me avoid writing this code:

let data: Data
let response: URLResponse
do {
   (data, response) = try await URLSession.shared.data(for: request)
} catch {
   throw RequestError.failedToLoadData(error)
}

And instead I could write this much more readable and convenient code:

let (data, response) = do {
   try await URLSession.shared.data(for: request)
} catch {
   throw RequestError.failedToLoadData(error)
}

Do I understand that right?

For this aspect alone, I'm supporting this pitch. I'm not so sure about the introduction of a then keyword though, I don't find it very intuitive on first read of the proposal. The aspect I'm most interested in is the allowance of do-expressions. It might be added in a much narrower proposal. I pitched another change here to solve the same problem:

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