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T18640a.hs:11:1: error: [GHC-25897]
    • Couldn't match kind ‘a’ with ‘*’
      Expected: forall (b :: k). * -> *
        Actual: forall (b :: k). * -> a
      ‘a’ is a rigid type variable bound by
        the type family declaration for ‘F2’
        at T18640a.hs:10:19
    • In the type family declaration for ‘F2’