T7278.hs:9:43: error: [GHC-25897]
    • Expected kind ‘* -> * -> *’, but ‘t’ has kind ‘k1’
      ‘k1’ is a rigid type variable bound by
        the type signature for ‘f’
        at T7278.hs:9:1-49
    • In the type signature:
        f :: (C (t :: k) (TF t)) => TF t p1 p0 -> t p1 p0