Syntactically nicer way of handling errors in Swift

[DevAndArtist (Adrian Meister)]

Refer to this idea and comments bellow:

Polymorphic methods in enums

Agreed about none of the alternatives seeming like improvements. Haskell's syntax for this is elegant, but it works because (1) the type signature is written separately and (2) the switched-on parameters are all explicit and so can be easily pattern-ized. In other words, it works because there's already some verbosity that people take for granted. I wonder how much of the clunkiness here is just the extra level of bracing required. Like if you had: func canAdvance() -> Int = switch { // imp…