Don there are several GHC trac bugs assigned to you. Any chance you might look at them. The 6.10 beta is this coming Friday! http://hackage.haskell.org/trac/ghc/ticket/2270 http://hackage.haskell.org/trac/ghc/ticket/2271 http://hackage.haskell.org/trac/ghc/ticket/1434 Thanks Simon