[Haskell-cafe] [ANNOUNCE] hashable-generics

[dag.odenhall at gmail.com]

On Tue, Nov 6, 2012 at 3:32 PM, Herbert Valerio Riedel <hvr at gnu.org> wrote:

> Clark Gaebel <cgaebel at uwaterloo.ca> writes:
> |   There's no disadvantage to having the generic functionality in a
> | separate package, right?
>

Well for one it means you can't simply write

    instance Class Type

but must write

    instance Class Type where
        forEveryMethod = genericForEveryMethod
        ...

and it wouldn't work with the planned generics feature that you could just
write

    data Type deriving Class

I for one think conditional APIs are all OK; a form of "progressive
enhancement".
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