I'm not sure I understand your question. But if you mean that you want to retrieve the type variable names, as they were defined in the source, then I can tell you that the generic deriving mechanism cannot do this.

Pedro

On Sun, Nov 6, 2011 at 14:35, Magicloud Magiclouds <magicloud.magiclouds@gmail.com> wrote:

Hi,
I'd like to simpler the work of deriving MyClass. And I have two
ways to do: TemplateHaskell "$(derivingMyClass)", or Generic "deriving
(MyClass)".
Since I need to get the type name in the deriving, then I met this
question: If I have "data A b = C b", then with TemplateHaskell, the
type would be "VarT b", which means at compile time, I cannot get the
exact type, so the type name would be "b".
So I wonder if this could be resolved by TemplateHaskell, or Generic
is the only choice.

PS: I have not tried to do this in Generic.
--
竹密岂妨流水过
山高哪阻野云飞

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