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T7869.hs:3:12: error:
    • Couldn't match type ‘b1’ with ‘b’
      ‘b1’ is a rigid type variable bound by
        an expression type signature:
          forall a1 b1. [a1] -> b1
        at T7869.hs:3:20-27
      ‘b’ is a rigid type variable bound by
        the inferred type of f :: [a] -> b
        at T7869.hs:3:1-27
      Expected type: [a1] -> b1
        Actual type: [a] -> b
    • In the expression: f x
      In the expression: (\ x -> f x) :: [a] -> b
      In an equation for ‘f’: f = (\ x -> f x) :: [a] -> b
    • Relevant bindings include f :: [a] -> b (bound at T7869.hs:3:1)