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tcfail014.hs:5:33: error:
    • Occurs check: cannot construct the infinite type: t4 ~ t4 -> t5
    • In the first argument of ‘z’, namely ‘z’
      In the expression: z z
      In an equation for ‘h’: h z = z z
    • Relevant bindings include
        z :: t4 -> t5 (bound at tcfail014.hs:5:27)
        h :: (t4 -> t5) -> t5 (bound at tcfail014.hs:5:25)