Dang it. That's exactly what does. I had somehow convinced myself that it only worked with instances that used GHC.Generics. On Mon, Jan 14, 2019 at 11:14 AM Matthew Pickering < matthewtpickering@gmail.com> wrote:

Is that not what DeriveAnyClass does?

On Mon, Jan 14, 2019 at 4:13 PM Andrew Martin wrote:

...

I was just doing the usual incantation for an exception type:

data DatagramException = ... deriving stock (Eq,Show) instance Exception Datagram

And it suddenly hit me what a shame it was that I cannot put the

Exception instance in a deriving clause like the others. It would be more visually pleasing to write:

...

data DatagramException = ... deriving stock (Eq,Show) deriving defaulted (Exception)

-- -Andrew Thaddeus Martin _______________________________________________ Libraries mailing list Libraries@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/libraries

-- -Andrew Thaddeus Martin