T9071.stderr 412 Bytes
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[1 of 2] Compiling T9071a           ( T9071a.hs, T9071a.o )
[2 of 2] Compiling T9071            ( T9071.hs, T9071.o )

T9071.hs:7:37:
    No instance for (Functor K)
      arising from the first field of ‘F’ (type ‘Mu (K a)’)
    Possible fix:
      use a standalone 'deriving instance' declaration,
        so you can specify the instance context yourself
    When deriving the instance for (Functor F)