Enum cases as protocol witnesses

[sveinhal (Svein Halvor Halvorsen)]

@Zhu_Shengqi

This kind of syntactic sugars may be of convenience in some cases (and for some users). But besides adding language complexity to compiling tools, there will also be tremendous cognitive burden (why enum cases should be treated as protocol methods?) to code readers and reviewers, new beginners, programmers come from other languages.

I disagree with this. Enum cases already work like static vars and functions, and can be used like that everywhere. Except for protocol conformances. That, to me, came as a real surprise when I first learnt it, and still baffles me as inconsistent and strange.

The proposed change would make the mental model easier IMHO, as it would make the enum story more consistent, with fewer exceptions. It would ease the cognitive burden.