On Thu, Oct 19, 2006 at 02:21:37PM -0500, John Goerzen wrote:
I had this code that worked in GHC 6.4:
type CommandHandler = FTPServer -> String -> IO Bool type Command = (String, (CommandHandler, (String, String)))
instance Eq Command where x == y = (fst x) == (fst y) instance Ord Command where compare x y = compare (fst x) (fst y)
I am compiling with overlapping instances set.
In GHC 6.6, this gives an error that Eq Command is a duplicate instance of one defined in Data.Tuple.
On Thu, Oct 19, 2006 at 04:27:57PM -0500, John Goerzen wrote:
[...], but this is a regression from GHC 6.4.
It's a change, but that's a risk one takes when using experimental features. Personally, I think it's an improvement: no longer can standard instances change because I've imported a module that happens to use overlapping instances.