On 10.05 13:27, Otakar Smrz wrote: > data ... = ... | forall b . FMap (b -> a) (Mapper s b) > > ... where FMap qf qc = stripFMap f q > > the GHC compiler as well as GHCi (6.4.2 and earlier) issue an error > > My brain just exploded. > I can't handle pattern bindings for existentially-quantified > constructors.
You can rewrite the code in a way that GHC accepts it. Just avoid pattern binding your variables. I had the same problem in HAppS code and needed to lift some code to the top level to solve it. - Einar Karttunen _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
