[Haskell-cafe] Externally derive instance of Data?

[Dimitry Golubovsky]

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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