José Pedro Magalhães wrote: > Hi Bernd, > > I guess this might be the same issue reported some time ago ( > http://thread.gmane.org/gmane.comp.lang.haskell.generics/53/focus=54): the > derived instances of Data do not define dataCast1. If you define your own > instance of Data for MyMaybe and add the definition of dataCast1 you will > get the expected behavior.
Your link pointed me in the right direction to fix the bug for my application. Many thanks! Did you submit a bug report? _______________________________________________ Glasgow-haskell-users mailing list [email protected] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
