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T7805.hs:7:21: error:
    • Expected kind ‘forall a. a -> a’, but ‘x’ has kind ‘k0’
      Cannot instantiate unification variable ‘k0’
      with a kind involving polytypes: forall a. a -> a
    • In the first argument of ‘HR’, namely ‘x’
      In the first argument of ‘F’, namely ‘(HR x)’
      In the type instance declaration for ‘F’