It's 7.8.2. On Sun, Apr 13, 2014 at 10:55 AM, Chris Wong wrote:

On Sun, Apr 13, 2014 at 8:45 PM, Konstantine Rybnikov 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-extension...

...

[1]: https://gist.github.com/k-bx/10574806

Try upgrading to GHC 7.8.2 first. I heard it fixes a serious bug in the type checker, which may be behind your problem.

...

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The containers package doesn't have these instances, you may want to open up an issue for it [1] - Adam [1] https://github.com/haskell/containers On Sun, Apr 13, 2014 at 11:07 AM, Konstantine Rybnikov wrote:

On Sun, Apr 13, 2014 at 10:45 AM, Konstantine Rybnikov 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-extension... [1]: https://gist.github.com/k-bx/10574806

Just FYI, IRC-user @Hermit fixed it by adding IsList instance to Map.

https://gist.github.com/Arm/10575474

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