how to evolve enum to add experimental cases?

[bishabosha]

Compiler version

3.1.0

Minimized code

enum Foo:
  @annotation.experimental case A

Output

-- Error:
2 |  @annotation.experimental case A
  |  ^
  |value A is marked @experimental and therefore may only be used in an experimental scope.

Expectation

The error makes sense, as values, valueOf, fromOrdinal etc reference A, but it does mean we can not "evolve" our enum to add new cases without making every method experimental.

Or perhaps those methods should all automatically become experimental as soon as an experimental case is added? (not good for downstream users of a library)

[odersky]

If we really care about this (I personally do not see a strong usecase), this should be a feature request.