Latest BNFC release broke generated `Abs.hs` modules. > `DeriveDataTypeable` is still needed to derive `Data`. _Originally posted by @fizruk in [8b1b96c](https://github.com/BNFC/bnfc/commit/8b1b96c221df9a60012ab53bbb9a45d98cd19322#r163830532)_