T9071_2.stderr 300 Bytes
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T9071_2.hs:7:40:
    No instance for (Functor Mu)
      arising from the first field of ‘F1’ (type ‘Mu (K1 a)’)
    Possible fix:
      use a standalone 'deriving instance' declaration,
        so you can specify the instance context yourself
    When deriving the instance for (Functor F1)