No. But it can be done as a library. Granted, it's not the same as 1st class support, but it's pretty good: https://github.com/pbackus/sumtype https://github.

No. But it can be done as a library. Granted, it's not the same as 1st class support, but it's pretty good: https://github.com/pbackus/sumtype https://github.com/pbackus/sumtype