+ -- If the file exists, and is not a .lhs file, then we
+ -- want to treat it as a .hs file.
+ --
+ -- If the file doesn't exist then GHC is going to look for
+ -- filename.hs and filename.lhs, and use the appropriate
+ -- type.
+ exists <- doesFileExist filename
+ let xflag = if exists && (takeExtension filename /= ".lhs")
+ then ["-x", "hs"]
+ else []