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tcfail065.hs:29:20:
    Couldn't match type `x1' with `x'
      `x1' is a rigid type variable bound by
           the type signature for setX :: x1 -> X x -> X x
           at tcfail065.hs:29:3
      `x' is a rigid type variable bound by
          the instance declaration at tcfail065.hs:28:18
    In the first argument of `X', namely `x'
    In the expression: X x
    In an equation for `setX': setX x (X _) = X x