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