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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: error:
    Couldn't match kind ‘* -> *’ with ‘*’
      arising from the first field of ‘F’ (type ‘Mu (K a)’)
    When deriving the instance for (Functor F)