Try upgrading to GHC 7.8.2 first. I heard it fixes a serious bug inOn Sun, Apr 13, 2014 at 8:45 PM, Konstantine Rybnikov <k-bx@k-bx.com> wrote:
> Hi!
>
> I wanted to check out great new OverloadedLists [0] feature, but got an
> error as in [1].
>
> What am I doing wrong?
>
> Thanks.
>
> [0]:
> https://www.haskell.org/ghc/docs/7.8.1/html/users_guide/type-class-extensions.html#overloaded-lists
> [1]: https://gist.github.com/k-bx/10574806
the type checker, which may be behind your problem.
>
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