[swift-evolution] [swift-evolution-announce] [Review] SE-0102: Remove @noreturn attribute and introduce an empty NoReturn type

Jordan Rose jordan_rose at apple.com
Thu Jun 23 16:15:54 CDT 2016

[Proposal: https://github.com/apple/swift-evolution/blob/master/proposals/0102-noreturn-bottom-type.md ]

I am already on record as being against this proposal:

> Just because it can be modelled as a type doesn’t mean it’s the best way to represent the concept. It feels like uniformity for uniformity’s sake.
> func fatalError() -> NoReturn
> @noreturn func fatalError()
> The first one probably isn't too hard to explain to a learner. The second one probably doesn’t need an explanation.


A few more thoughts: I don't think uninhabited types actually come up very often (though non-returning functions are also pretty rare). I'm not against supporting composition for actual uninhabited types, but I don't think composition of NoReturn/Never is particularly interesting. I don't find throws<Never> compelling enough to add language support for it, but maybe I just can't think of a case where you want to be generic over error types.

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