2010/10/27 Andy Stewart <lazycat.mana...@gmail.com>:
> Hi all,
>
> I want use TH write some function like below:
>
> data DataType = StringT
> | IntT
> | CharT
>
> parse :: [(String,DataType)] -> (TypeA, TypeB, ... TypeN)
>
> Example:
>
> parse [("string", StringT), ("001", IntT), ("c", CharT)]
>
> will return:
>
> ("string", 001, 'c')
>
> So how to use TH write 'parse' function?
I think that you should use TH properly, without compiler and logical errors.
What actually do you want?
I think that parse should have type (parse :: [(String, DataType)] -> Q Exp).
I think that OverloadedStrings extension should serve you as well.
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