11 Dec
2016
11 Dec
'16
4:14 p.m.
The typeclass Contravariant (from the contravariant package) is both useful and fundamental. I would like to see this moved into base. One additional motivating factor is that it would become possible for a DeriveContravariant extension to be written in a future GHC release. I'd love to hear other people's thoughts, even if it's as simple as a yea or nay. Thanks. -Andrew Martin