deriving support

[fommil]

hi!

I was just wondering if you did anything more on the deriving support?

Also you didn't raise a merge request against https://gitlab.com/fommil/scalaz-deriving/ so I can't see our work 😄

[carymrobbins]

For sure, some other stuff took priority, but I was actually able to get things working by adding code to the plugin - https://gitlab.com/carymrobbins/scalaz-deriving/tree/newtype

Here's a branch with some fixes for newtype that make the feature above work - https://github.com/estatico/scala-newtype/tree/deriving

As it currently stands I think the remaining work needed is to prevent the companion object from extending Function when a companion is not defined.

[fommil]

hmm. Disabling extending the function might be very complicated to pull off, since we're just duplicating what scalac does. The right thing to do there is to use class instead of case class. (Or on your side you could remove Function if it is synthetic)

[carymrobbins]

Turned out to be pretty simple, let's see what you think - https://gitlab.com/fommil/scalaz-deriving/merge_requests/149