1.1 --- a/src/Tools/Code/code_haskell.ML	Fri Sep 09 06:47:14 2011 +0200
     1.2 +++ b/src/Tools/Code/code_haskell.ML	Thu Sep 08 12:23:11 2011 +0200
     1.3 @@ -446,7 +446,7 @@
     1.4      (target, { serializer = serializer, literals = literals,
     1.5        check = { env_var = "ISABELLE_GHC", make_destination = I,
     1.6          make_command = fn module_name =>
     1.7 -          "\"$ISABELLE_GHC\" -XRankNTypes -XScopedTypeVariables -odir build -hidir build -stubdir build -e \"\" " ^
     1.8 +          "\"$ISABELLE_GHC\" -XRankNTypes -XScopedTypeVariables -XEmptyDataDecls -odir build -hidir build -stubdir build -e \"\" " ^
     1.9              module_name ^ ".hs" } })
    1.10    #> Code_Target.add_tyco_syntax target "fun" (SOME (2, fn print_typ => fn fxy => fn [ty1, ty2] =>
    1.11        brackify_infix (1, R) fxy (