Precise error typing in Swift

As long as the language offers an easy, automatic way to erase the error, I really don't see the problem here. As a framework author I'd rather offer precise errors the user can erase with a standard mechanism than erased errors the user has to recover by knowing about my error types.

IMO, it's simple enough to have throws and throws ErrorType, where any throw of a typed error from within a throws function will automatically be erased to Error.

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