Types and decoder for the errors field in the GraphQL response. See http://facebook.github.io/graphql/draft/#sec-Errors.
List Error
{ message : String
, locations : Maybe (List Location)
, path : Maybe (List PathSegment)
}
{ line : Basics.Int
, column : Basics.Int
}
decoder : Json.Decode.Decoder Errors
errorDecoder : Json.Decode.Decoder Error
locationDecoder : Json.Decode.Decoder Location
pathSegmentDecoder : Json.Decode.Decoder PathSegment