Hello, On Thu, Mar 12, 2009 at 17:02, Bernd Brassel <[email protected]>wrote:
> 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? > > Now I did: http://hackage.haskell.org/trac/ghc/ticket/3087 Thanks, Pedro
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