Comparing enum cases while ignoring associated values

Using Swift
5

I think that, similar to SE-0194, the best way to provide this feature would be to add a CaseDiscriminatable (to be bike-shedded) protocol, for which, like CaseEnumerable a compiler-provided default implementation would be created for same-file extensions.

e.g:

protocol CaseDiscriminatable {
  associatedtype Discriminator: Hashable
  var case: Discriminator
}
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