Am Dienstag, 5. August 2014, 13:59:26 schrieb Brandon Allbery: > On Tue, Aug 5, 2014 at 1:47 PM, Volker Wysk <[email protected]> > > So you need to be able to change the definition of the data type, in order > > to > > add deriving (Typeable). It's not possible to add a Typeable instance > > declaration later. > > Are you sure? There is a standalone deriving syntax. > > deriving instance Typeable ProcessStatus
Yes, that's the solution. You need these options for GHC: -XStandaloneDeriving -XDeriveDataTypeable Thanks, and Bye, V.W. _______________________________________________ Glasgow-haskell-users mailing list [email protected] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
