The following program
import Complex
instance Ord a => Ord (Complex a) where
(x1 :+ y1) `compare` (x2 :+ y2) = (x1, y1) `compare` (x2, y2)
gives the message
ERROR Bug.hs:3 - Cannot build superclass instance
*** Instance : Ord (Complex a)
*** Context supplied : Ord a
*** Required superclass : Eq (Complex a)
What is hugs' problem here? It compiles with ghc.
--
-- Johannes Waldmann ---- http://www.informatik.uni-leipzig.de/~joe/ --
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