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T10503.hs:8:6: error:
    • Could not deduce: k ~ *
      from the context: Proxy 'KProxy ~ Proxy 'KProxy
        bound by the type signature for:
                   h :: (Proxy 'KProxy ~ Proxy 'KProxy) => r
        at T10503.hs:8:6-85
      ‘k’ is a rigid type variable bound by
        the type signature for:
          h :: forall k r. ((Proxy 'KProxy ~ Proxy 'KProxy) => r) -> r
        at T10503.hs:8:6-85
    • In the ambiguity check for ‘h’
      To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
      In the type signature:
        h :: forall r.
             ((Proxy ( 'KProxy :: KProxy k) ~ Proxy ( 'KProxy :: KProxy *)) =>
              r)
             -> r