Whoops from me also...
It was mine instance. Sorry for the noise.
Thanks!
2016-03-07 18:24 GMT+03:00 Adam Bergmark
Whoops, didn’t reply-all!
One instance is in Data.Aeson.Types.Instances, where are you getting the other one from?
Adam Bergmark
On Mon 07 Mar 2016 at 15:37 Dmitry Olshansky
> wrote: Hello,
I tried to compile my project with GHC 8 (from HEAD).
And I got
• Overlapping instances for aeson-0.11.1.0:Data.Aeson.Types.Class.ToJSON ... arising from a use of ‘serve’ Matching instances: two instances involving out-of-scope types instance aeson-0.11.1.0:Data.Aeson.Types.Class.ToJSON b => aeson-0.11.1.0:Data.Aeson.Types.Class.ToJSON (Data.Tagged.Tagged a b) -- Defined in ‘aeson-0.11.1.0:Data.Aeson.Types.Instances’ instance forall k x (r :: k). aeson-0.11.1.0:Data.Aeson.Types.Class.ToJSON x => aeson-0.11.1.0:Data.Aeson.Types.Class.ToJSON (Data.Tagged.Tagged r x)
One of instances should be removed probably. I suppose that instance for removing should be instance in Data.Tagged. But version in Aeson should be PolyKinded.
What do you think?
Best regards, Dmitry
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