[Hs-Generics] RE: Traversible Functor Data, or: X marks the spot (Re: Haddock version during build)

[Simon Peyton-Jones]

| I suggest to separate the vacuous from the proper instances,
| and to expose only the former via Data.Generics. That way,
| the convenience is only an import away, but doesn't get in
| the way of non-standard applications.

Probably the right thing is to use the libraries modification process to effect the change.  (For what it's worth, I don't feel strongly about this.)

Simon