Jordan Rose 797901fc41 Enable @unknown default warnings by default in Swift 5 mode (#16045) ...

Note that I said "warnings"; we're going to be more cautious about
rollout and just make this a warning in Swift 5 mode, with /no/
diagnostics in Swift 3 and 4. Users are still free to use `@unknown
default` in these modes, and they'll get a fatal run-time error if
they don't and an unexpected case actually shows up.

rdar://problem/29324688

2018-04-20 17:04:31 -07:00

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