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T20189.hs:7:5: error: [GHC-88464]
    • Found hole: _ :: t
      Where: ‘t’ is a rigid type variable bound by
               the type signature for:
                 y :: forall t. (t ~ (forall x. Show x => x -> IO ())) => t
               at T20189.hs:6:1-49
    • In an equation for ‘y’: y = _
    • Relevant bindings include y :: t (bound at T20189.hs:7:1)
      Constraints include
        t ~ (forall x. Show x => x -> IO ()) (from T20189.hs:6:1-49)
      Valid hole fits include y :: t (bound at T20189.hs:7:1)