Is pattern matching impossible with parameter packs?

[stuchlej (Mikoláš Stuchlík)]

How to implement `Optional.zip` using variadic generics?

Welp, I got something working, but it's a little bit hacky. Would love to know if there's a more elegant way to do this currently, or if it's a limitation of what we've got so far. (It seems like there may not be a way to iterate over elements of the pack and "short-circuit" partway through, except for throwing an error?) struct _UnwrapError: Error {} func zip<each T>(_ pack: repeat (each T)?) -> (repeat each T)? { do { return (repeat try (each pack).orThrow()) } catch { return nil…