Windows XPD:\Tools\ghc>ghc-6.2.1\bin\ghc.exe -fglasgow-exts foo.hsghc.exe: panic! (the `impossible' happened, GHC version 6.2.1): deSugar/DsMeta.hs:286: Non-exhaustive patterns in function repCmodule Foo whereimport Language.Haskell.THSyntaxclass MyInterface a where foo :: a -> Intdata AnyMyInterface = forall a. (MyInterface a) => AnyMyInterface atest = do{ d <- unQ(reifyDecl AnyMyInterface) ; print d }