Joe Groff c03371afc1 Sema: NSValue-to-value-type casts are failable and should be checked. ...

In Swift 4 mode, no longer consider e.g. 'nsNumber as Int' or 'nsValue as NSRange' to be valid coercions. This would break compatibility with Swift 3, so in Swift 3 mode, accept the coercion, but *also* accept a checked cast without a warning, and raise a migration warning about the unchecked coercion.

2017-01-13 13:51:27 -08:00

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