This is a nice new diagnostic in Swift 4.2pic.twitter.com/F7ZsTF2SKX
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I want this but for completion block exhaustiveness 
Yea it doesn't really look like it. I'm not sure what other cases it catches as well.
I guess it's a warning in Rust, too. I thought for sure it was an error https://play.rust-lang.org/?gist=3d650eb777df9775b74751ae179c46f1&version=undefined&mode=undefined …
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