autocomplete-haskell is already using backend haskell-ghc-mod, and new backend haskell-ghc-mod appeared. You can select one in autocomplete-haskell settings. Will keep using haskell-ghc-mod for now.
Does it say it uses haskell-ghc-mod instead of haskell-ghc-mod?
Apparently it does. This probably means that haskell-ghc-mod was activated twice for some reason? Not entirely sure. How did you manage to get ac-h to spew this nonsense I wonder?
Does it say it uses haskell-ghc-mod instead of haskell-ghc-mod?