22 Jan
2013
22 Jan
'13
2:34 p.m.
I just found mkTyCon3 which generates the fingerprint automatically. (I was looking at Data.Typeable.Internal.mkTyCon before.) That answers my question. (Of course, a way to derive the instance would be even better...) Roman * Roman Cheplyaka <roma@ro-che.info> [2013-01-22 15:28:55+0200]
I need to declare a Typeable instance for a type which has an argument of kind * -> *. GHC refuses to derive it.
What is a recommended way to go about it?
In particular, if I write the instance by hand, how important is the fingerprint, and how could I generate it?
Roman