How about a "deriving defaulted" deriving strategy

[Andrew Martin]

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 at gmail.com> wrote:

> Is that not what DeriveAnyClass does?
>
> On Mon, Jan 14, 2019 at 4:13 PM Andrew Martin <andrew.thaddeus at gmail.com>
> 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 at haskell.org
> > http://mail.haskell.org/cgi-bin/mailman/listinfo/libraries
>


-- 
-Andrew Thaddeus Martin
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