Joe Groff fb4a769f05 Sema: Warn when Swift classes attempt to implement ObjC +initialize. ...

Swift's language model doesn't guarantee that type metadata will ever really be used, which makes overriding initialize() error-prone and not really any better than manually invoking an initialization function. Warn about this for Swift 3 compatibility and reject attempts to override +initialize in Swift 4.

2017-01-17 15:06:44 -08:00

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