Hi Dimitry, I think what you want is stand-alone deriving: http://www.haskell.org/ghc/docs/latest/html/users_guide/deriving.html#stand-... Cheers, Pedro On Fri, Sep 11, 2009 at 16:29, Dimitry Golubovsky wrote:

Hi,

Given a datatype defined somewhere in a third-party package, without deriving (Data) specified.

Is it possible, in my module which is importing that datatype from that package, to auto-derive instance of Data for the said datatype? The goal is not to recompile the package just because an auto-derived instance is needed.

Or no way other than to recompile the package?

Thanks.

-- Dimitry Golubovsky

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