Re: [nhc-bugs] Error importing Control.Monad (liftM2) with newtype

Ian Lynagh writes:

This happens with both nhc98 1.16 and 1.18:

$ cat Q.hs module Q () where import Control.Monad (liftM2) newtype A a = A a

$ nhc98 -c Q.hs nhc98comp: isRealData InfoClass 1 Prelude.Monad IEnone \/ b . (1 b) [38,39,40,41] [] [(5,([],[])),(25,([],[])),(26,([],[]))]

Good bug report. Tricky thing to find, but I tracked it down after a while using Hat. Patch attached. Regards, Malcolm