> On Dec 21, 2017, at 10:33 AM, Jordan Rose via swift-evolution > <swift-evolution@swift.org> wrote: > > The main blocker was that such a case becomes untestable (see also "Testing > invalid cases").
You can always make it testable through appropriate factoring—for example, have the `future` case call a helper function, and then explicitly invoke that helper function to test its behavior. That won't give you coverage of the `future` case itself, but there's nothing on the table that will (not even `default` when all the existing cases are covered). -- Brent Royal-Gordon Architechies
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